phpBB getimagesize + get remote image headers (max 48kb) for getimagesize() + 60min positive temp cache + cURL + fsockopen + fopen

gistfile1.php

<?php
/* Todo:
* + avoid timeouts with an countdown?
* + get width/height with imagecreatefromstring
*/

echo '<hr>Test 1 with my curl + getimagesize + fopen fallback: <br>';



$start = microtime(true);

function phpbb_getimagesize_fn($data, $readonly = false)
{
	static $chk = '';
	if ($readonly)
	{
		$get = $chk;
		$chk = '';
		return $get;
	}
	$chk .= $data;
}

function phpbb_getimagesize($url)
{
	static $limit = 49152; // bytes
	//static $avoid_timeout = time(); // avoid timeouts with an countdown
	//static $limit_func_hits = 0; // function hit limit
	//if ($limit_func_hits++ >= 100) { return 'UNABLE_GET_IMAGE_SIZE'; }
	
	if (function_exists('curl_init'))
	{
		// php 5.3+ only
		// use function writefn($ch, $chunk) { ... } for earlier versions
		$writefn = function($ch, $chunk) {
			static $limit = 49152; // bytes
			static $curl_data = '';

			$len = strlen($curl_data) + strlen($chunk);
			if ($len >= $limit)
			{
				//$curl_data .= substr($chunk, 0, $limit - strlen($curl_data));
				phpbb_getimagesize_fn($chunk);
				$curl_data = '';
				return -1;
			}

			$curl_data .= $chunk;
			phpbb_getimagesize_fn($chunk);
			return strlen($chunk);
		};

		$headers = array(
			'Range: bytes=0-' . $limit,
		);

		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 2); // CURLOPT_CONNECTTIMEOUT_MS = 1200
		curl_setopt($ch, CURLOPT_TIMEOUT, 2); // CURLOPT_TIMEOUT_MS = 1200
		curl_setopt($ch, CURLOPT_RANGE, '0-' . $limit);
		curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
		curl_setopt($ch, CURLOPT_WRITEFUNCTION, $writefn);
		$result = curl_exec($ch);
		curl_close($ch);

		// save temp file
		$chunk = phpbb_getimagesize_fn('', true);
		$fp = fopen('./store/testimgdata.jpg', 'wb');
		fwrite($fp, $chunk);
		fclose($fp);
		$is = getimagesize('./store/testimgdata.jpg');
		unset($curl_data);
	}
	elseif (function_exists('fsockopen'))
	{
		// ... ??
	}
	else
	{
		//global $phpbb_root_path;
		//$tmpfilename = tempnam($phpbb_root_path . 'store/', unique_id() . '-');
		$tmpfilename = './store/testimgdata.jpg';
		$fp = fopen($url, 'rb');
		// TODO: stream_set_timeout($fp, 4); // timeout 
		if (!$fp) return false; 
		$tmpfile = fopen($tmpfilename, 'wb');
		$size = 0;
		while ($size < $limit && !feof($fp))
		{
			$content = fread($fp, 8192);
			$size += 8192;
			fwrite($tmpfile, $content);
		}
echo '<b>' . $size . '</b> ';
		fclose($fp);
		fclose($tmpfile);
		$is = getimagesize($tmpfilename);
		//unlink($tmpfilename);
	}

	// get size
	echo "size: ";
	print_r($is);
}



phpbb_getimagesize('http://digilicious.org/gallery/worldmap/Worldmap_short_names_large.png');
echo '<hr>';
phpbb_getimagesize('http://www.esa.int/images/image2-492-20110120-8974-HighresImage-02-PhobosFlyby.jpg');
echo '<hr>';
phpbb_getimagesize('http://iambrony.jsmart.web.id/mlp/gif/212381__safe_animated_scootaloo_vector_artist-deadparrot22.gif_001.gif');

echo '<hr>FALSE with 32kb:<br />';
phpbb_getimagesize('http://kingsfordhomestead.com.au/hi_res/120312_KHS_Images_1074-Edit.jpg');
echo '<hr>';
phpbb_getimagesize('http://eoimages.gsfc.nasa.gov/images/imagerecords/79000/79383/14_goe_2012259_lrg.jpg');


$stop = round(microtime(true) - $start, 5);
echo "<br> ({$stop}s)";
unset($start);