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weblib.php
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weblib.php
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<?php // $Id$
///////////////////////////////////////////////////////////////////////////
// //
// NOTICE OF COPYRIGHT //
// //
// Moodle - Modular Object-Oriented Dynamic Learning Environment //
// http://moodle.com //
// //
// Copyright (C) 2001-2003 Martin Dougiamas http://dougiamas.com //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation; either version 2 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details: //
// //
// http://www.gnu.org/copyleft/gpl.html //
// //
///////////////////////////////////////////////////////////////////////////
/**
* Library of functions for web output
*
* Library of all general-purpose Moodle PHP functions and constants
* that produce HTML output
*
* Other main libraries:
* - datalib.php - functions that access the database.
* - moodlelib.php - general-purpose Moodle functions.
* @author Martin Dougiamas
* @version $Id$
* @license http://www.gnu.org/copyleft/gpl.html GNU Public License
* @package moodlecore
*/
/// Constants
/// Define text formatting types ... eventually we can add Wiki, BBcode etc
/**
* Does all sorts of transformations and filtering
*/
define('FORMAT_MOODLE', '0'); // Does all sorts of transformations and filtering
/**
* Plain HTML (with some tags stripped)
*/
define('FORMAT_HTML', '1'); // Plain HTML (with some tags stripped)
/**
* Plain text (even tags are printed in full)
*/
define('FORMAT_PLAIN', '2'); // Plain text (even tags are printed in full)
/**
* Wiki-formatted text
*/
define('FORMAT_WIKI', '3'); // Wiki-formatted text
/**
* Markdown-formatted text http://daringfireball.net/projects/markdown/
*/
define('FORMAT_MARKDOWN', '4'); // Markdown-formatted text http://daringfireball.net/projects/markdown/
/**
* Allowed tags - string of html tags that can be tested against for safe html tags
* @global string $ALLOWED_TAGS
*/
$ALLOWED_TAGS =
'<p><br><b><i><u><font><table><tbody><span><div><tr><td><th><ol><ul><dl><li><dt><dd><h1><h2><h3><h4><h5><h6><hr><img><a><strong><emphasis><em><sup><sub><address><cite><blockquote><pre><strike><embed><object><param><acronym><nolink><lang><tex><algebra><math><mi><mn><mo><mtext><mspace><ms><mrow><mfrac><msqrt><mroot><mstyle><merror><mpadded><mphantom><mfenced><msub><msup><msubsup><munder><mover><munderover><mmultiscripts><mtable><mtr><mtd><maligngroup><malignmark><maction><cn><ci><apply><reln><fn><interval><inverse><sep><condition><declare><lambda><compose><ident><quotient><exp><factorial><divide><max><min><minus><plus><power><rem><times><root><gcd><and><or><xor><not><implies><forall><exists><abs><conjugate><eq><neq><gt><lt><geq><leq><ln><log><int><diff><partialdiff><lowlimit><uplimit><bvar><degree><set><list><union><intersect><in><notin><subset><prsubset><notsubset><notprsubset><setdiff><sum><product><limit><tendsto><mean><sdev><variance><median><mode><moment><vector><matrix><matrixrow><determinant><transpose><selector><annotation><semantics><annotation-xml><tt><code>';
/**
* Allowed protocols - array of protocols that are safe to use in links and so on
* @global string $ALLOWED_PROTOCOLS
*/
$ALLOWED_PROTOCOLS = array('http', 'https', 'ftp', 'news', 'mailto', 'rtsp', 'teamspeak', 'gopher', 'color');
/// Functions
/**
* Add quotes to HTML characters
*
* Returns $var with HTML characters (like "<", ">", etc.) properly quoted.
* This function is very similar to {@link p()}
*
* @param string $var the string potentially containing HTML characters
* @return string
*/
function s($var) {
if (empty($var)) {
return '';
}
return htmlSpecialChars(stripslashes_safe($var));
}
/**
* Add quotes to HTML characters
*
* Prints $var with HTML characters (like "<", ">", etc.) properly quoted.
* This function is very similar to {@link s()}
*
* @param string $var the string potentially containing HTML characters
* @return string
*/
function p($var) {
if (empty($var)) {
echo '';
}
echo htmlSpecialChars(stripslashes_safe($var));
}
/**
* Ensure that a variable is set
*
* Return $var if it is defined, otherwise return $default,
* This function is very similar to {@link optional_variable()}
*
* @param mixed $var the variable which may be unset
* @param mixed $default the value to return if $var is unset
* @return mixed
*/
function nvl(&$var, $default='') {
return isset($var) ? $var : $default;
}
/**
* Remove query string from url
*
* Takes in a URL and returns it without the querystring portion
*
* @param string $url the url which may have a query string attached
* @return string
*/
function strip_querystring($url) {
if ($commapos = strpos($url, '?')) {
return substr($url, 0, $commapos);
} else {
return $url;
}
}
/**
* Returns the URL of the HTTP_REFERER, less the querystring portion
* @return string
*/
function get_referer() {
return strip_querystring(nvl($_SERVER['HTTP_REFERER']));
}
/**
* Returns the name of the current script, WITH the querystring portion.
* this function is necessary because PHP_SELF and REQUEST_URI and SCRIPT_NAME
* return different things depending on a lot of things like your OS, Web
* server, and the way PHP is compiled (ie. as a CGI, module, ISAPI, etc.)
* <b>NOTE:</b> This function returns false if the global variables needed are not set.
*
* @return string
*/
function me() {
if (!empty($_SERVER['REQUEST_URI'])) {
return $_SERVER['REQUEST_URI'];
} else if (!empty($_SERVER['PHP_SELF'])) {
if (!empty($_SERVER['QUERY_STRING'])) {
return $_SERVER['PHP_SELF'] .'?'. $_SERVER['QUERY_STRING'];
}
return $_SERVER['PHP_SELF'];
} else if (!empty($_SERVER['SCRIPT_NAME'])) {
if (!empty($_SERVER['QUERY_STRING'])) {
return $_SERVER['SCRIPT_NAME'] .'?'. $_SERVER['QUERY_STRING'];
}
return $_SERVER['SCRIPT_NAME'];
} else if (!empty($_SERVER['URL'])) { // May help IIS (not well tested)
if (!empty($_SERVER['QUERY_STRING'])) {
return $_SERVER['URL'] .'?'. $_SERVER['QUERY_STRING'];
}
return $_SERVER['URL'];
} else {
notify('Warning: Could not find any of these web server variables: $REQUEST_URI, $PHP_SELF, $SCRIPT_NAME or $URL');
return false;
}
}
/**
* Like {@link me()} but returns a full URL
* @see me()
* @return string
*/
function qualified_me() {
if (!empty($_SERVER['SERVER_NAME'])) {
$hostname = $_SERVER['SERVER_NAME'];
} else if (!empty($_ENV['SERVER_NAME'])) {
$hostname = $_ENV['SERVER_NAME'];
} else if (!empty($_SERVER['HTTP_HOST'])) {
$hostname = $_SERVER['HTTP_HOST'];
} else if (!empty($_ENV['HTTP_HOST'])) {
$hostname = $_ENV['HTTP_HOST'];
} else {
notify('Warning: could not find the name of this server!');
return false;
}
if (isset($_SERVER['HTTPS'])) {
$protocol = ($_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://';
} else if (isset($_SERVER['SERVER_PORT'])) { # Apache2 does not export $_SERVER['HTTPS']
$protocol = ($_SERVER['SERVER_PORT'] == '443') ? 'https://' : 'http://';
} else {
$protocol = 'http://';
}
$url_prefix = $protocol.$hostname;
return $url_prefix . me();
}
/**
* Determine if a web referer is valid
*
* Returns true if the referer is the same as the goodreferer. If
* the referer to test is not specified, use {@link qualified_me()}.
* If the admin has not set secure forms ($CFG->secureforms) then
* this function returns true regardless of a match.
*
* @uses $CFG
* @param string $goodreferer the url to compare to referer
* @return boolean
*/
function match_referer($goodreferer = '') {
global $CFG;
if (empty($CFG->secureforms)) { // Don't bother checking referer
return true;
}
if ($goodreferer == 'nomatch') { // Don't bother checking referer
return true;
}
if (empty($goodreferer)) {
$goodreferer = qualified_me();
}
$referer = get_referer();
return (($referer == $goodreferer) or ($referer == $CFG->wwwroot .'/'));
}
/**
* Determine if there is data waiting to be processed from a form
*
* Used on most forms in Moodle to check for data
* Returns the data as an object, if it's found.
* This object can be used in foreach loops without
* casting because it's cast to (array) automatically
*
* Checks that submitted POST data exists, and also
* checks the referer against the given url (it uses
* the current page if none was specified.
*
* @uses $CFG
* @param string $url the url to compare to referer for secure forms
* @return boolean
*/
function data_submitted($url='') {
global $CFG;
if (empty($_POST)) {
return false;
} else {
if (match_referer($url)) {
return (object)$_POST;
} else {
if ($CFG->debug > 10) {
notice('The form did not come from this page! (referer = '. get_referer() .')');
}
return false;
}
}
}
/**
* Moodle replacement for php stripslashes() function
*
* The standard php stripslashes() removes ALL backslashes
* even from strings - so C:\temp becomes C:temp - this isn't good.
* This function should work as a fairly safe replacement
* to be called on quoted AND unquoted strings (to be sure)
*
* @param string the string to remove unsafe slashes from
* @return string
*/
function stripslashes_safe($string) {
$string = str_replace("\\'", "'", $string);
$string = str_replace('\\"', '"', $string);
$string = str_replace('\\\\', '\\', $string);
return $string;
}
/**
* Recursive implementation of stripslashes()
*
* This function will allow you to strip the slashes from a variable.
* If the variable is an array or object, slashes will be stripped
* from the items (or properties) it contains, even if they are arrays
* or objects themselves.
*
* @param mixed the variable to remove slashes from
* @return mixed
*/
function stripslashes_recursive($var) {
if(is_object($var)) {
$properties = get_object_vars($var);
foreach($properties as $property => $value) {
$var->$property = stripslashes_recursive($value);
}
}
else if(is_array($var)) {
foreach($var as $property => $value) {
$var[$property] = stripslashes_recursive($value);
}
}
else if(is_string($var)) {
$var = stripslashes($var);
}
return $var;
}
/**
* Given some normal text this function will break up any
* long words to a given size by inserting the given character
*
* @param string $string the string to be modified
* @param int $maxsize maximum length of the string to be returned
* @param string $cutchar the string used to represent word breaks
* @return string
*/
function break_up_long_words($string, $maxsize=20, $cutchar=' ') {
if (in_array(current_language(), array('ja', 'ja_utf8', 'kn_utf8', 'sr_utf8', 'vi_utf8', 'zh_cn', 'zh_tw', 'zh_tw_utf8'))) { // Multibyte languages
return $string;
}
$output = '';
$length = strlen($string);
$wordlength = 0;
for ($i=0; $i<$length; $i++) {
$char = $string[$i];
if ($char == ' ' or $char == "\t" or $char == "\n" or $char == "\r") {
$wordlength = 0;
} else {
$wordlength++;
if ($wordlength > $maxsize) {
$output .= $cutchar;
$wordlength = 0;
}
}
$output .= $char;
}
return $output;
}
/**
* This does a search and replace, ignoring case
* This function is only used for versions of PHP older than version 5
* which do not have a native version of this function.
* Taken from the PHP manual, by bradhuizenga @ softhome.net
*
* @param string $find the string to search for
* @param string $replace the string to replace $find with
* @param string $string the string to search through
* return string
*/
if (!function_exists('str_ireplace')) { /// Only exists in PHP 5
function str_ireplace($find, $replace, $string) {
if (!is_array($find)) {
$find = array($find);
}
if(!is_array($replace)) {
if (!is_array($find)) {
$replace = array($replace);
} else {
// this will duplicate the string into an array the size of $find
$c = count($find);
$rString = $replace;
unset($replace);
for ($i = 0; $i < $c; $i++) {
$replace[$i] = $rString;
}
}
}
foreach ($find as $fKey => $fItem) {
$between = explode(strtolower($fItem),strtolower($string));
$pos = 0;
foreach($between as $bKey => $bItem) {
$between[$bKey] = substr($string,$pos,strlen($bItem));
$pos += strlen($bItem) + strlen($fItem);
}
$string = implode($replace[$fKey],$between);
}
return ($string);
}
}
/**
* Locate the position of a string in another string
*
* This function is only used for versions of PHP older than version 5
* which do not have a native version of this function.
* Taken from the PHP manual, by dmarsh @ spscc.ctc.edu
*
* @param string $haystack The string to be searched
* @param string $needle The string to search for
* @param int $offset The position in $haystack where the search should begin.
*/
if (!function_exists('stripos')) { /// Only exists in PHP 5
function stripos($haystack, $needle, $offset=0) {
return strpos(strtoupper($haystack), strtoupper($needle), $offset);
}
}
/**
* Load a template from file
*
* Returns a (big) string containing the contents of a template file with all
* the variables interpolated. all the variables must be in the $var[] array or
* object (whatever you decide to use).
*
* <b>WARNING: do not use this on big files!!</b>
*
* @param string $filename Location on the server's filesystem where template can be found.
* @param mixed $var Passed in by reference. An array or object which will be loaded with data from the template file.
*/
function read_template($filename, &$var) {
$temp = str_replace("\\", "\\\\", implode(file($filename), ''));
$temp = str_replace('"', '\"', $temp);
eval("\$template = \"$temp\";");
return $template;
}
/**
* Set a variable's value depending on whether or not it already has a value.
*
* If variable is set, set it to the set_value otherwise set it to the
* unset_value. used to handle checkboxes when you are expecting them from
* a form
*
* @param mixed $var Passed in by reference. The variable to check.
* @param mixed $set_value The value to set $var to if $var already has a value.
* @param mixed $unset_value The value to set $var to if $var does not already have a value.
*/
function checked(&$var, $set_value = 1, $unset_value = 0) {
if (empty($var)) {
$var = $unset_value;
} else {
$var = $set_value;
}
}
/**
* Prints the word "checked" if a variable is true, otherwise prints nothing,
* used for printing the word "checked" in a checkbox form element.
*
* @param boolean $var Variable to be checked for true value
* @param string $true_value Value to be printed if $var is true
* @param string $false_value Value to be printed if $var is false
*/
function frmchecked(&$var, $true_value = 'checked', $false_value = '') {
if ($var) {
echo $true_value;
} else {
echo $false_value;
}
}
/**
* This function will create a HTML link that will work on both
* Javascript and non-javascript browsers.
* Relies on the Javascript function openpopup in javascript.php
*
* $url must be relative to home page eg /mod/survey/stuff.php
* @param string $url Web link relative to home page
* @param string $name Name to be assigned to the popup window
* @param string $linkname Text to be displayed as web link
* @param int $height Height to assign to popup window
* @param int $width Height to assign to popup window
* @param string $title Text to be displayed as popup page title
* @param string $options List of additional options for popup window
* @todo Add code examples and list of some options that might be used.
* @param boolean $return Should the link to the popup window be returned as a string (true) or printed immediately (false)?
* @return string
* @uses $CFG
*/
function link_to_popup_window ($url, $name='popup', $linkname='click here',
$height=400, $width=500, $title='Popup window', $options='none', $return=false) {
global $CFG;
if ($options == 'none') {
$options = 'menubar=0,location=0,scrollbars,resizable,width='. $width .',height='. $height;
}
$fullscreen = 0;
if (!(strpos($url,$CFG->wwwroot) === false)) { // some log url entries contain _SERVER[HTTP_REFERRER] in which case wwwroot is already there.
$url = substr($url, strlen($CFG->wwwroot)+1);
}
$link = '<a target="'. $name .'" title="'. $title .'" href="'. $CFG->wwwroot . $url .'" '.
"onclick=\"return openpopup('$url', '$name', '$options', $fullscreen);\">$linkname</a>";
if ($return) {
return $link;
} else {
echo $link;
}
}
/**
* This function will print a button submit form element
* that will work on both Javascript and non-javascript browsers.
* Relies on the Javascript function openpopup in javascript.php
*
* $url must be relative to home page eg /mod/survey/stuff.php
* @param string $url Web link relative to home page
* @param string $name Name to be assigned to the popup window
* @param string $linkname Text to be displayed as web link
* @param int $height Height to assign to popup window
* @param int $width Height to assign to popup window
* @param string $title Text to be displayed as popup page title
* @param string $options List of additional options for popup window
* @todo Add code examples and list of some options that might be used.
* @return string
* @uses $CFG
*/
function button_to_popup_window ($url, $name='popup', $linkname='click here',
$height=400, $width=500, $title='Popup window', $options='none') {
global $CFG;
if ($options == 'none') {
$options = 'menubar=0,location=0,scrollbars,resizable,width='. $width .',height='. $height;
}
$fullscreen = 0;
echo '<input type="button" name="popupwindow" title="'. $title .'" value="'. $linkname .' ..." '.
"onclick=\"return openpopup('$url', '$name', '$options', $fullscreen);\" />\n";
}
/**
* Prints a simple button to close a window
*/
function close_window_button() {
echo '<center>' . "\n";
echo '<script type="text/javascript">' . "\n";
echo '<!--' . "\n";
echo "document.write('<form>');\n";
echo "document.write('<input type=\"button\" onclick=\"self.close();\" value=\"".get_string("closewindow")."\" />');\n";
echo "document.write('</form>');\n";
echo '-->' . "\n";
echo '</script>' . "\n";
echo '<noscript>' . "\n";
print_string('closewindow');
echo '</noscript>' . "\n";
echo '</center>' . "\n";
}
/**
* Given an array of value, creates a popup menu to be part of a form
* $options["value"]["label"]
*
* @param type description
* @todo Finish documenting this function
*/
function choose_from_menu ($options, $name, $selected='', $nothing='choose', $script='', $nothingvalue='0', $return=false) {
if ($nothing == 'choose') {
$nothing = get_string('choose') .'...';
}
if ($script) {
$javascript = 'onchange="'. $script .'"';
} else {
$javascript = '';
}
$output = '<select name="'. $name .'" '. $javascript .'>' . "\n";
if ($nothing) {
$output .= ' <option value="'. $nothingvalue .'"'. "\n";
if ($nothingvalue === $selected) {
$output .= ' selected="selected"';
}
$output .= '>'. $nothing .'</option>' . "\n";
}
if (!empty($options)) {
foreach ($options as $value => $label) {
$output .= ' <option value="'. $value .'"';
if ($value == $selected) {
$output .= ' selected="selected"';
}
if ($label === '') {
$output .= '>'. $value .'</option>' . "\n";
} else {
$output .= '>'. $label .'</option>' . "\n";
}
}
}
$output .= '</select>' . "\n";
if ($return) {
return $output;
} else {
echo $output;
}
}
/**
* Implements a complete little popup form
*
* @uses $CFG
* @param string $common The URL up to the point of the variable that changes
* @param array $options Alist of value-label pairs for the popup list
* @param string $formname Name must be unique on the page
* @param string $selected The option that is already selected
* @param string $nothing The label for the "no choice" option
* @param string $help The name of a help page if help is required
* @param string $helptext The name of the label for the help button
* @param boolean $return Indicates whether the function should return the text
* as a string or echo it directly to the page being rendered
* @param string $targetwindow The name of the target page to open the linked page in.
* @return string If $return is true then the entire form is returned as a string.
* @todo Finish documenting this function<br>
*/
function popup_form($common, $options, $formname, $selected='', $nothing='choose', $help='', $helptext='', $return=false, $targetwindow='self') {
global $CFG;
static $go, $choose; /// Locally cached, in case there's lots on a page
if (empty($options)) {
return '';
}
if (!isset($go)) {
$go = get_string('go');
}
if ($nothing == 'choose') {
if (!isset($choose)) {
$choose = get_string('choose');
}
$nothing = $choose.'...';
}
$startoutput = '<form action="'.$CFG->wwwroot.'/course/jumpto.php"'.
' method="get"'.
' target="'.$CFG->framename.'"'.
' name="'.$formname.'"'.
' style="display: inline;">';
$output = '<select name="jump" onchange="'.$targetwindow.'.location=document.'.$formname.
'.jump.options[document.'.$formname.'.jump.selectedIndex].value;">'."\n";
if ($nothing != '') {
$output .= " <option value=\"javascript:void(0)\">$nothing</option>\n";
}
$inoptgroup = false;
foreach ($options as $value => $label) {
if (substr($label,0,2) == '--') { /// we are starting a new optgroup
/// Check to see if we already have a valid open optgroup
/// XHTML demands that there be at least 1 option within an optgroup
if ($inoptgroup and (count($optgr) > 1) ) {
$output .= implode('', $optgr);
$output .= ' </optgroup>';
}
unset($optgr);
$optgr = array();
$optgr[] = ' <optgroup label="'. substr($label,2) .'">'; // Plain labels
$inoptgroup = true; /// everything following will be in an optgroup
continue;
} else {
$optstr = ' <option value="' . $common . $value . '"';
if ($value == $selected) {
$optstr .= ' selected="selected"';
}
if ($label) {
$optstr .= '>'. $label .'</option>' . "\n";
} else {
$optstr .= '>'. $value .'</option>' . "\n";
}
if ($inoptgroup) {
$optgr[] = $optstr;
} else {
$output .= $optstr;
}
}
}
/// catch the final group if not closed
if ($inoptgroup and count($optgr) > 1) {
$output .= implode('', $optgr);
$output .= ' </optgroup>';
}
$output .= '</select>';
$output .= '<noscript id="noscript'.$formname.'" style="display: inline;">';
$output .= '<input type="submit" value="'.$go.'" /></noscript>';
$output .= '<script type="text/javascript">'.
"\n<!--\n".
'document.getElementById("noscript'.$formname.'").style.display = "none";'.
"\n-->\n".'</script>';
$output .= '</form>' . "\n";
if ($help) {
$button = helpbutton($help, $helptext, 'moodle', true, false, '', true);
} else {
$button = '';
}
if ($return) {
return $startoutput.$button.$output;
} else {
echo $startoutput.$button.$output;
}
}
/**
* Prints some red text
*
* @param string $error The text to be displayed in red
*/
function formerr($error) {
if (!empty($error)) {
echo '<font color="#ff0000">'. $error .'</font>';
}
}
/**
* Validates an email to make sure it makes sense.
*
* @param string $address The email address to validate.
* @return boolean
*/
function validate_email($address) {
return (ereg('^[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+'.
'@'.
'[-!#$%&\'*+\\/0-9=?A-Z^_`a-z{|}~]+\.'.
'[-!#$%&\'*+\\./0-9=?A-Z^_`a-z{|}~]+$',
$address));
}
/**
* Extracts file argument either from file parameter or PATH_INFO
*
* @param string $scriptname name of the calling script
* @return string file path (only safe characters)
*/
function get_file_argument($scriptname) {
global $_SERVER;
$relativepath = FALSE;
// first try normal parameter (compatible method == no relative links!)
$relativepath = optional_param('file', FALSE, PARAM_PATH);
// then try extract file from PATH_INFO (slasharguments method)
if (!$relativepath and !empty($_SERVER['PATH_INFO'])) {
$path_info = $_SERVER['PATH_INFO'];
// check that PATH_INFO works == must not contain the script name
if (!strpos($path_info, $scriptname)) {
$relativepath = clean_param(rawurldecode($path_info), PARAM_PATH);
if ($relativepath === '/test') {
print_header();
notice ('Slasharguments work - using PATH_INFO parameter :-D');
print_footer();
die;
}
}
}
// now if both fail try the old way
// (for compatibility with misconfigured or older buggy php implementations)
if (!$relativepath) {
$arr = explode($scriptname, me());
if (!empty($arr[1])) {
$path_info = strip_querystring($arr[1]);
$relativepath = clean_param(rawurldecode($path_info), PARAM_PATH);
if ($relativepath === '/test') {
print_header();
notice ('Slasharguments work - using compatibility hack :-|');
print_footer();
die;
}
}
}
return $relativepath;
}
/**
* Check for bad characters ?
*
* @param string $string ?
* @param int $allowdots ?
* @todo Finish documenting this function - more detail needed in description as well as details on arguments
*/
function detect_munged_arguments($string, $allowdots=1) {
if (substr_count($string, '..') > $allowdots) { // Sometimes we allow dots in references
return true;
}
if (ereg('[\|\`]', $string)) { // check for other bad characters
return true;
}
if (empty($string) or $string == '/') {
return true;
}
return false;
}
/**
* Searches the current environment variables for some slash arguments
*
* @param string $file ?
* @todo Finish documenting this function
*/
function get_slash_arguments($file='file.php') {
if (!$string = me()) {
return false;
}
$pathinfo = explode($file, $string);
if (!empty($pathinfo[1])) {
return addslashes($pathinfo[1]);
} else {
return false;
}
}
/**
* Extracts arguments from "/foo/bar/something"
* eg http://mysite.com/script.php/foo/bar/something
*
* @param string $string ?
* @param int $i ?
* @return array|string
* @todo Finish documenting this function
*/
function parse_slash_arguments($string, $i=0) {
if (detect_munged_arguments($string)) {
return false;
}
$args = explode('/', $string);
if ($i) { // return just the required argument
return $args[$i];
} else { // return the whole array
array_shift($args); // get rid of the empty first one
return $args;
}
}
/**
* Just returns an array of text formats suitable for a popup menu
*
* @uses FORMAT_MOODLE
* @uses FORMAT_HTML
* @uses FORMAT_PLAIN
* @uses FORMAT_WIKI
* @uses FORMAT_MARKDOWN
* @return array
*/
function format_text_menu() {
return array (FORMAT_MOODLE => get_string('formattext'),
FORMAT_HTML => get_string('formathtml'),
FORMAT_PLAIN => get_string('formatplain'),
FORMAT_WIKI => get_string('formatwiki'),
FORMAT_MARKDOWN => get_string('formatmarkdown'));
}
/**
* Given text in a variety of format codings, this function returns
* the text as safe HTML.
*
* @uses $CFG
* @uses FORMAT_MOODLE
* @uses FORMAT_HTML
* @uses FORMAT_PLAIN
* @uses FORMAT_WIKI
* @uses FORMAT_MARKDOWN
* @param string $text The text to be formatted. This is raw text originally from user input.
* @param int $format Identifier of the text format to be used
* (FORMAT_MOODLE, FORMAT_HTML, FORMAT_PLAIN, FORMAT_WIKI, FORMAT_MARKDOWN)
* @param array $options ?
* @param int $courseid ?
* @return string
* @todo Finish documenting this function
*/
function format_text($text, $format=FORMAT_MOODLE, $options=NULL, $courseid=NULL ) {
global $CFG, $course;
if (!empty($CFG->cachetext)) {
$time = time() - $CFG->cachetext;
$md5key = md5($text);
if ($cacheitem = get_record_select('cache_text', "md5key = '$md5key' AND timemodified > '$time'")) {
return $cacheitem->formattedtext;
}
}
if (empty($courseid)) {
if (!empty($course->id)) { // An ugly hack for better compatibility
$courseid = $course->id;
}
}
$CFG->currenttextiscacheable = true; // Default status - can be changed by any filter
switch ($format) {
case FORMAT_HTML:
replace_smilies($text);
if (!isset($options->noclean)) {
$text = clean_text($text, $format);
}
$text = filter_text($text, $courseid);
break;
case FORMAT_PLAIN:
$text = htmlentities($text);
$text = rebuildnolinktag($text);
$text = str_replace(' ', ' ', $text);
$text = nl2br($text);
break;
case FORMAT_WIKI:
$text = wiki_to_html($text,$courseid);
$text = rebuildnolinktag($text);
if (!isset($options->noclean)) {
$text = clean_text($text, $format);
}
$text = filter_text($text, $courseid);
break;
case FORMAT_MARKDOWN:
$text = markdown_to_html($text);
if (!isset($options->noclean)) {
$text = clean_text($text, $format);
}
replace_smilies($text);
$text = filter_text($text, $courseid);
break;
default: // FORMAT_MOODLE or anything else
if (!isset($options->smiley)) {