Server : Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.4.20 System : Linux st2.domain.com 3.10.0-1127.10.1.el7.x86_64 #1 SMP Wed Jun 3 14:28:03 UTC 2020 x86_64 User : apache ( 48) PHP Version : 7.4.20 Disable Function : NONE Directory : /var/www/html/thietkewebvumi.com/ |
<?php
//Start the session so we can store what the security code actually is
session_start();
//Send a generated image to the browser
create_image();
exit();
function create_image()
{
//Let's generate a totally random string using md5
$md5_hash = md5(rand(0,999));
//We don't need a 32 character long string so we trim it down to 5
$security_code = substr($md5_hash, 15, 3);
//Set the session to store the security code
$_SESSION["security_code"] = $security_code;
//Set the image width and height
$im = imagecreate(80, 25);
//white background and blue text
$bg = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 128, 0, 0);
//Add randomly generated string in white to the image
imagestring($im, 5, 20, 8, $security_code, $textcolor);
//Tell the browser what kind of file is come in
header("Content-Type: image/jpeg");
//Output the newly created image in jpeg format
imagejpeg($im);
//Free up resources
imagedestroy($im);
}
?>