PHP LibrariesVerification code libraryPasswordLibr PHP library for generating verification codes<?php
session_start();
header("Content-type:image/png");
$img_width=100;
$img_height=20;
srand(microtime()*100000);
for($i=0;$i<4;$i++)
{
$new_number.=dechex(rand(0,15));
}
$_SESSION[check_auth]=$new_number;
$new_number=imageCreate($img_width,$img_height);//创建图象
ImageColorAllocate($new_number,255,255,255); //设置背景色为白色
for($i=0;$i<strlen($_SESSION[check_auth]);$i++)
{
$font=mt_rand(3,5);
$x=mt_rand(1,8) + $img_width*$i/4;
$y=mt_rand(1,$img_height/4);
$color=imageColorAllocate($new_number,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200));//设置字符颜色
imageString($new_number,$font,$x,$y,$_SESSION[check_auth][$i],$color);//输出字符
}
ImagePng($new_number);
ImageDestroy($new_number);
?>The GD library is a very powerful library for image manipulation in PHP.
First add a line of reference in php.ini: extension=php_gd2.dll
Restart apache. Make a test page var_dump(gd_info()); the output data shows that the GD library is referenced successfully.
Form auth.html
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