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    <p>I've modified the @Volomike's code to get width too. Here you go...</p> <pre> function get_image_dim($sURL) { // note that for jpeg you may need to change 300 to a larger value, // as some height/width info is farther out in the header try { $hSock = @ fopen($sURL, 'rb'); if ($hSock) { while(!feof($hSock)) { $vData = fread($hSock, 300); break; } fclose($hSock); if (strpos(' ' . $vData, 'JFIF')>0) { $vData = substr($vData, 0, 300); $asResult = unpack('H*',$vData); $sBytes = $asResult[1]; $width = 0; $height = 0; $hex_width = ''; $hex_height = ''; if (strstr($sBytes, 'ffc2')) { $hex_height = substr($sBytes, strpos($sBytes, 'ffc2') + 10, 4); $hex_width = substr($sBytes, strpos($sBytes, 'ffc2') + 14, 4); } else { $hex_height = substr($sBytes, strpos($sBytes, 'ffc0') + 10, 4); $hex_width = substr($sBytes, strpos($sBytes, 'ffc0') + 14, 4); } $width = hexdec($hex_width); $height = hexdec($hex_height); return array('width' => $width, 'height' => $height); } elseif (strpos(' ' . $vData, 'GIF')>0) { $vData = substr($vData, 0, 300); $asResult = unpack('h*',$vData); $sBytes = $asResult[1]; $sBytesH = substr($sBytes, 16, 4); $height = hexdec(strrev($sBytesH)); $sBytesW = substr($sBytes, 12, 4); $width = hexdec(strrev($sBytesW)); return array('width' => $width, 'height' => $height); } elseif (strpos(' ' . $vData, 'PNG')>0) { $vDataH = substr($vData, 22, 4); $asResult = unpack('n',$vDataH); $height = $asResult[1]; $vDataW = substr($vData, 18, 4); $asResult = unpack('n',$vDataW); $width = $asResult[1]; return array('width' => $width, 'height' => $height); } } } catch (Exception $e) {} return FALSE; } </pre> <p>So, using it we have...</p> <pre> // jpeg $url = 'http://upload.wikimedia.org/wikipedia/commons/thumb/c/ce/Quality_comparison_jpg_vs_saveforweb.jpg/250px-Quality_comparison_jpg_vs_saveforweb.jpg'; // png //$url = 'http://upload.wikimedia.org/wikipedia/commons/thumb/4/47/PNG_transparency_demonstration_1.png/280px-PNG_transparency_demonstration_1.png'; // gif //$url = 'http://upload.wikimedia.org/wikipedia/commons/e/e2/Sunflower_as_gif_small.gif'; $dim = get_image_dim($url); print_r($dim); </pre>
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