PHP get remote picture size function Example

Usage echo remote_filesize ($url, $user = ", $PW ="); $url = "http://www.aa.com/librarys/images/random/rand_11.jpg";//Picture address Echo remote_filesize ($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, does 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 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 is a content-length field, its value//would now is 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 '; } Copy Code Realization idea: First curl obtains the picture to the buffer, then obtains the picture the Content-length information, namely realizes obtains the remote picture size the function.

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