Example of getting the size of a remote image in php_PHP tutorial

Just look at the code, it’s very clear

Copy the code The code is as follows:

//Usage echo remote_filesize( $url,$user='',$pw='');
$url = "http://www.aa.com/librarys/images/random/rand_11.jpg";//To be replaced here Your image address
echo remote_filesize($url,$user='',$pw='');

function remote_filesize($uri,$user='',$pw='')
{
// start output buffering
ob_start();
// initialize curl with given uri
$ch = curl_init($uri); // make sure we get the header
curl_setopt($ch, CURLOPT_HEADER, 1); // make it a http HEAD request
curl_setopt($ch, CURLOPT_NOBODY , 1); // if auth is needed, do it here
if (!empty($user) && !empty($pw))
{
$headers = array('Authorization: Basic ' . base64_encode($user.':'.$pw));
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
}
$okay = curl_exec($ch);
curl_close( $ch); // get the output buffer
$head = ob_get_contents(); // clean the output buffer and return to previous // buffer settings
ob_end_clean(); // gets you the numeric value from the Content-Length // field in the http header
$regex = '/Content-Length:s([0-9].+?)s/';
$count = preg_match($regex, $head , $matches); // if there was a Content-Length field, its value // will now be in $matches[1]
if (isset($matches[1]))
{
$size = $matches[1];
}
else
{
$size = 'unknown';
}
$last_mb = round($size/(1024*1024 ),3);
$last_kb = round($size/1024,3);
return $last_kb . 'KB / ' . $last_mb.' MB';
}

The idea of ​​the function is to first get the image into the buffer with CURL, and then get the Content-Length information of the image using regular expression.

http://www.bkjia.com/PHPjc/825146.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/825146.htmlTechArticleLet’s look at the code directly. The easy-to-understand copy of the code is as follows: //Usage echo remote_filesize($url,$ user='',$pw=''); $url = "http://www.aa.com/librarys/images/random/rand_11.jpg";/...