PHP Generate clickable Refresh code simple example _php tips

The example in this article describes the verification code that PHP generates a clickable refresh. Share to everyone for your reference, specific as follows:

HTML file:

Authentication code file gd.php:

<?php
$im =imagecreate (50,20);
$b =imagecolorallocate ($im, 0,0,0);
$w =imagecolorallocate ($im, 255,255,255);
$mask = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$text = "";
For ($i =1 $i <=4; $i + +) {
  $index =rand (0,61);
  $text. = $mask {$index};
}
Imagestring ($im, 3,rand (10,20), Rand (0,10), $text, $w);
Header ("Content-type:image/jpeg");
Imagejpeg ($im);
? >

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I hope this article will help you with the PHP program design.