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PHP获取验证码图片到本地,支持png、gif、jpg三种格式的验证码。在实现时,PHP判断图片格式是使用的php内置的exif_imagetype函数,确实比较方便,学习PHP的不妨可参考下本代码: view sourceprint?01 02header("Content-type:image/png"); 03set_time_limit(0);//设置超时时间 04$url = $_GET['url']; 05$url = ""; 06if(empty($url)){ 07 echo "没有图片"; 08 die; 09} 10$imginfo = GetImageSize ( $url ); 11$type = exif_imagetype($url); 12$imgw = $imginfo [0]; 13$imgh = $imginfo [1]; 14$bg = imagecreatetruecolor($imgw,$imgh); 15if($type==IMAGETYPE_GIF){ 16 $image = imagecreatefromgif($url); 17}elseif($type==IMAGETYPE_JPEG){ 18 $image = imagecreatefromjpeg($url); 19}elseif($type==IMAGETYPE_PNG){ 20 $image = imagecreatefrompng($url); 21} 22imagecolorallocate($image,255,255,255); 23imagecopy($bg,$image,0,0, 0,0,$imgw,$imgh); 24imagedestroy($image); 25ImagePng($bg); 26?> |