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php-PHP做了一个验证码，之前一直好好的，但突然就用不了了，加载不出来了！

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Release： 2016-06-02 11:28:28
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验证码php函数 

<code> function verifyImg($width=80,$height=30){//定义画布$img=imagecreatetruecolor($width, $height);//定义颜色$white=imagecolorallocate($img, 255, 255, 255);$black=imagecolorallocate($img, 0, 0, 0);//画出画布imagefilledrectangle($img, 1, 1, $width-2, $height-2, $white);//写字$size=mt_rand(18,22);$angle=mt_rand(-3,3);$x=mt_rand(2,10);$y=mt_rand(20,28);$fontfiles='../font/simhei.ttf';$_SESSION['verify']=$str=randomStr();imagettftext($img, $size, $angle, $x, $y, $black,$fontfiles ,$str);//增加干扰点for($i=0;$i</code>
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请大神帮小弟看看是哪里出了问题了！
搞得我毫无头绪！
之前一直用得好好的，突然间就用不了了！
GD库是开了的啊！

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验证码 php 函数
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