Implementation of verification code without the need of GD library

Implementation of verification code without the need of GD library
//+-------------------------------------------------
//| * File validate_image.php
//| * Function to implement website login verification code
//| * Version 1.0.0
//| * Date 2005-4-1
//| * Author Northwest Wolf QQ 500784 Cokeyang at hotmail.com
//| * Copyright http://www.adibaby.com[temporarily closed]
//| * How to use:
//| In advance in support of the GD library to do some of the pictures, we recommend the use of GIF format, file name and image
//| The number in the face is the same, put the picture in a folder. Set the data inside the CONFIG.
//| Reference
//| Verify page comparison
//| $_cookie[' Validate '] = = MD5 ($_post[' input '])
|==================config start===================
$image _path= "numimage";//The picture file path does not have a '/'
$image _ext = "gif";//Picture file extension
===================config end=====================
$imagelist = Array ();
if ($handle =opendir ($image _path)) {
while (False!== ($file =readdir ($handle))) {
$filename =explode (".", $file);
$imagelist [] = $filename [0];
Unset ($filename);
}
Closedir ($handle);
unset ($imagelist [0]);
Unset ($imagelist [1]);
}
Srand (float) microtime () *103e//| Reference
//| Verify page comparison
//| $_cookie[' Validate '] = = MD5 ($_post[' input '])
|==================config start===================
$image _path= "numimage";//The picture file path does not have a '/'
$image _ext = "gif";//Picture file extension
===================config end=====================
$imagelist = Array ();
if ($handle =opendir ($image _path)) {
while (False!== ($file =readdir ($handle))) {
$filename =explode (".", $file);
$imagelist [] = $filename [0];
Unset ($filename);
}
Closedir ($handle);
unset ($imagelist [0]);
Unset ($imagelist [1]);
}
Srand (float) microtime () *10000000);
$filename = $imagelist [Array_rand ($imagelist)];
Setcookie ("Validate", MD5 ($filename));
Header (' content-type:application/'. $image _ext);
echo implode (', File ($image _path. /". $filename.". $image _ext));
?>

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