- 相关推荐
基于php验证码函数的使用示例有哪些
复制代码 代码如下:
function _code($_code_length = 4, $_width = 75, $_height = 25){
for($i=0;$i<$_code_length;$i++){
$_nmsg .= dechex(mt_rand(0,15));
}
$_SESSION["code"] = $_nmsg;
$_img = imagecreatetruecolor($_width, $_height);
$_white = imagecolorallocate($_img, 250, 250, 250);
imagefill($_img, 0, 0, $_white);
$_gray = imagecolorallocate($_img, 196, 196, 196);
imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_gray);
for ($i=0; $i < 6; $i++) {
$_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
imageline($_img, mt_rand(0,$_width), mt_rand(0, $_height),mt_rand(0,$_width), mt_rand(0, $_height), $_md_color);
}
for ($i=0; $i < 50; $i++) {
$_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
imagestring($_img, 1, mt_rand(1,$_width-5), mt_rand(1, $_height-5), "*", $_md_color);
}
for ($i=0; $i < $_code_length ; $i++) {
$_md_color = imagecolorallocate($_img, mt_rand(0,102), mt_rand(0,102), mt_rand(0,102));
imagestring($_img, 5, $i * $_width/$_code_length+ mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION["code"][$i], $_md_color);
}
header("Content-Type:image/png");
imagepng($_img);
imagedestroy($_img);
}
【基于php验证码函数的使用示例有哪些】相关文章:
PHP中函数的使用说明09-01
PHP的压缩函数06-21
浅析php函数的实例06-08
excel函数有哪些种类11-16
PHP开发环境安装的方法有哪些10-27
php函数method-exists()与is-callable()有何区别07-27
php外部执行命令函数10-27
简单介绍php构造函数用法08-31
PHP中的排序函数区别分析08-23
探讨PHP函数的实现原理及性能07-07