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27 lines
847 B
27 lines
847 B
<?php
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session_start();
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//生成验证码图片
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Header("Content-type: image/PNG");
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$im = imagecreate(44,18); // 画一张指定宽高的图片
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$back = ImageColorAllocate($im, 245,245,245); // 定义背景颜色
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imagefill($im,0,0,$back); //把背景颜色填充到刚刚画出来的图片中
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$vcodes = "";
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srand((double)microtime()*1000000);
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//生成4位数字
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for($i=0;$i<4;$i++){
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$font = ImageColorAllocate($im, rand(100,255),rand(0,100),rand(100,255)); // 生成随机颜色
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$authnum=rand(1,9);
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$vcodes.=$authnum;
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imagestring($im, 5, 2+$i*10, 1, $authnum, $font);
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}
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$_SESSION['v_code'] = $vcodes;
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for($i=0;$i<200;$i++) //加入干扰象素
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{
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$randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
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imagesetpixel($im, rand()%70 , rand()%30 , $randcolor); // 画像素点函数
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}
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ImagePNG($im);
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ImageDestroy($im);
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?>
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