How to create captcha image by php

Hello guys, how are you? May god keep better you at this moment. However, We see the captcha varification in many website.

You can create it using php very easily. I have added the php code which will create a captcha image. Let's view the code

<?php session_start(); $md5_hash = md5(rand(0,9999)); $security_code = substr($md5_hash, 25, 5); $enc=md5($security_code); $_SESSION['count'] = $enc; $secure = $_SESSION['count']; // echo "--------------------------$secure "; $width = 100; $height = 40; $image = ImageCreate($width, $height); $white = ImageColorAllocate($image, 255, 255, 255); $black = ImageColorAllocate($image, 0, 100, 0); $grey = ImageColorAllocate($image, 204, 204, 204); ImageFill($image, 0, 0, $grey); //Add randomly generated string in white to the image ImageString($image, 10, 30, 10, $security_code, $black); ImageRectangle($image,0,16,$width-1,$height-1,$grey); imageline($image, 0, $height/2, $width, $height/2, $grey); imageline($image, $width/2, 0, $width/2, $height, $grey); header("Content-Type: image/jpeg"); ImageJpeg($image); ImageDestroy($image); ImageDestroy($image); ?>

Save this code with name "captcha.php". Now run this code in your server. What's you seeing. A box with some text. Now it's time to create the form for use this captcha system.

Create a new file name "index.php" or any name. Paste this code to the file.

<?php session_start(); ?><br /> <form name="form1" method="post" action="validate.php"> <table border="1" width="380" align="center" cellspacing="2" cellpadding="0" bgcolor="#A4EEFF"> <tr><td><br /> <table bgcolor="" align="center"> <tr> <td align="center" colspan="2"><img src="captcha.php"><br /> <br /> <br /> <input type="button" value="Refresh Image" onClick="window.location.href=window.location.href"></td></tr> <tr> <td align="center"> Please enter the value shown in the image.</td> <tr> <td align="center"><input name="number" type="text"></td> <tr> <td align="center"><br /> <input name="Submit" type="submit" value="Submit"></td> </tr> </table> </TD></TR> </table> </form>

Now create another file name "validate.php". This file will use to check the code entered in the form if right or wrong.

<form name="form1" method="post" action="form.php"> <div align="center"> <input name="Submit" type="submit" value="back"></div> </form> <div align="center"> <?php @session_start(); $key=$_SESSION['count']; $imag = $_POST['number']; $user = md5($imag); //echo "$imag = = = $key "; //echo("$user"); if($user==$key) { echo ("Verification success"); } else{ echo "You have entered wrong verification code";} ?><br /> </div>

Now run the index.php file or other which you create to save the form code.

Now hits bellow share button to share this post with your friends.