PHP gets the remote verification code to the local PHP function code_PHP tutorial

PHP obtains the verification code image locally and supports verification codes in three formats: png, gif, and jpg. During implementation, PHP uses PHP's built-in exif_imagetype function to determine the image format, which is indeed more convenient. Those who learn PHP may wish to refer to this code:

view sourceprint?01

　02header("Content-type:image/png");

　03set_time_limit(0);//Set the timeout

　04$url = $_GET['url'];

　05$url = "http://vcer.baidu.com/verify";

　06if(empty($url)){

　07 echo "No picture";

　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?>

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