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PHP版本问题导致image组件不能正常运行

时间：2011-09-28

来源：互联网

PHP code

<?php

session_start();

//随机码的个数
$_rnd_code = 4;

//创建随机码
for ($i=0; $i<$_rnd_code; $i++) {
    $_nmsg .= dechex(mt_rand(0, 15));
}

//保存在session
$_SESSION['code'] = $_nmsg;

//长和高
$_width = 75;
$_height = 25;

//创建一张图像
$_img = imagecreatetruecolor($_width, $_height);

//白色
$_white = imagecolorallocate($_img, 255, 255, 255);

//填充
imagefill($_img,0,0,$_white);

$_flag = false;

if ($_flag) {
    //黑色,边框
    $_black = imagecolorallocate($_img, 0, 0, 0);
    imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_black);
}

//随即画出6个线条
for ($i=0; $i<6; $i++) {
    $_rnd_color = imagecolorallocate($_img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
    imageline($_img, mt_rand(0, $_width), mt_rand(0, $_height), mt_rand(0, $_width), mt_rand(0, $_height), $_rnd_color);
}

//随即雪花
for ($i=0; $i<100; $i++) {
    $_rnd_color = imagecolorallocate($_img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
    imagestring($_img, 1, mt_rand(1, $_width), mt_rand(1, $_height), '*', $_rnd_color);
}

//输出验证码
for ($i=0; $i<strlen($_SESSION['code']); $i++) {
    $_rnd_color = imagecolorallocate($_img, mt_rand(0, 100), mt_rand(0, 150), mt_rand(0, 200));
    imagestring($_img, 5, $i*$_width/$_rnd_code+mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION['code'][$i], $_rnd_color);
}

//输出图像
header('Content-Type: image/png');
imagepng($_img);

//销毁
imagedestroy($_img);

?>