chnage

composer.json

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+{
+  "name": "kamal/math-captcha",
+  "description": "Math captcha in PHP",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Kamal Pandey",
+      "email": "kml.pandey77@gmail.com"
+    }
+  ],
+  "autoload": {
+    "psr-4": {
+      "Captcha\\": "src/Captcha"
+    }
+  },
+  "require": {}
+}

src/Captcha/Captcha.php

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+<?php
+namespace Captcha;
+
+class Captcha {
+
+    public $first_num;
+    public $second_num;
+    public $operators = array('+', '-', '*');
+    public $operator;
+    protected $answer;
+
+    function __construct(){
+        if (session_status() == PHP_SESSION_NONE || session_status() == 1) {
+            session_start();
+        }
+
+        $this->first_num = rand(1, 10);
+        $this->second_num = rand(1, 10);
+        $operator = rand(0, count($this->operators) -1);
+        $this->operator = $this->operators[$operator];
+
+        if($this->operator == '-' && $this->first_num < $this->second_num){
+            $first = $this->second_num;
+            $second = $this->first_num;
+            $this->second_num = $second;
+            $this->first_num = $first;
+        }
+
+        $this->calculater();
+    }
+
+    protected function calculater()
+    {
+        switch($this->operator){
+            case '*':
+            $this->answer = $this->first_num * $this->second_num;
+            break;
+
+            case '+':
+            $this->answer = $this->first_num + $this->second_num;
+            break;
+
+            case '-':
+            $this->answer = $this->first_num - $this->second_num;
+            break;
+
+        }
+
+        $_SESSION['anser'] = $this->answer;
+    }
+
+    public function check()
+    {
+        return isset($_POST['captcha']) && isset($_SESSION['anser']) ?
+                ((int) $_POST['captcha'] == $_SESSION['anser'])
+                :false;
+    }
+
+    public function math()
+    {
+        return "{$this->first_num} {$this->operator} {$this->second_num}"; 
+    }
+
+    function __toString()
+    {
+        return $this->math(); 
+    }
+
+
+
+}
+
+

test/index.php

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+<?php 
+session_start();
+require_once '../vendor/autoload.php';
+
+use \Captcha\Captcha;
+
+
+if(isset($_POST['submit'])){
+
+	if(Captcha::check()){
+		die('answer is correct');
+	}else{
+		die('answer is incorrect');
+	}
+}
+
+$capctha = new Captcha();
+
+?>
+
+<form action="" method="post">
+    <p>Answer it <?php echo $capctha ?> <br>
+        <input type="text" name="captcha">
+    </p>
+    <p><button type="submit" name="submit">Submit</button></p>
+</form>
+