来源：phpfans.net
<?php
$im = imagecreate(48, 25);
$backgroundcolor = imagecolorallocate ($im, 255, 255, 255);
$black = imagecolorallocate($im,100,100,100);
$bordercolor = imagecolorallocate($im , 150, 150, 150);
//debug 增加图片的掺杂特性
$linenums = mt_rand(10, 32);
for($i=0; $i <= $linenums; $i++) {
$linecolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$linex = mt_rand(0, 48);
$liney = mt_rand(0, 25);
imageline($im, $linex, $liney, $linex + mt_rand(0, 4) - 2, $liney + mt_rand(0, 4) - 2, $linecolor);
}
for($i=0; $i <= 64; $i++) {
$pointcolor = imagecolorallocate($im, mt_rand(50, 255), mt_rand(50, 255), mt_rand(50, 255));
imagesetpixel($im, mt_rand(0, 48), mt_rand(0, 25), $pointcolor);
}
$string = "";
$arr = array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','a','b');//把想要码的填进来
srand((double) microtime()*10000000);
$randcode = array_rand($arr,4);
for($i=0;$i<4;$i++){//生成4位随机数
$string .= $arr[$randcode[$i]];
}
imagerectangle($im, 0, 0, 47, 24, $bordercolor);
imagestring($im,7,4,4,$string,$black);
//debug 合成图片
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
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