12306 verification code php mathematical operation verification code implementation code

Copy the code The code is as follows:

//----------------------------- -------
// File description: Mathematical operation verification code
// File author: Jesse Lee
// Last updated: 2008-09-07
//----------- --------------------------
session_start();
$sessionvar = 'vdcode'; //Session variable name
$width = 150; //Image width
$height = 20; //Image height
$operator = '+-*'; //Operator
$code = array();
$code[] = mt_rand(1,9);
$code[] = $operator{mt_rand(0,2)};
$code[] = mt_rand(1,9);
$code[] = $operator{mt_rand(0,2)};
$code[ ] = mt_rand(1,9);
$codestr = implode('',$code);
eval("$result = ".implode('',$code).";");
$code[] = '=';
$_SESSION[$sessionvar] = $result;
$img = ImageCreate($width,$height);
ImageColorAllocate($img, mt_rand(230,250), mt_rand(230,250), mt_rand(230,250)) ;
$color = ImageColorAllocate($img, 0, 0, 0);
$offset = 0;
foreach ($code as $char) {
$offset += 20;
$txtcolor = ImageColorAllocate($img, mt_rand (0,255), mt_rand(0,150), mt_rand(0,255));
ImageChar($img, mt_rand(3,5), $offset, mt_rand(1,5), $char, $txtcolor);
}
for ( $i=0; $i<100; $i++) {
$pxcolor = ImageColorAllocate($img, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255));
ImageSetPixel($img, mt_rand(0,$ width), mt_rand(0,$height), $pxcolor);
}
header('Content-type: image/png');
ImagePng($img);
?>

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