file_exists()

<?php

$ch = curl_init("http://www.example.com/favicon.ico");
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$retcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo $retcode;
?>

<?php
	
	function curl_get_headers($url, $timeout = 20, $connect_timeout = 5, $follow_location = false, $max_redirs = 5)
	{
		if(extension_loaded("curl"))
		{
			$handle = curl_init();
			
			curl_setopt($handle, CURLOPT_URL, $url);
			
			curl_setopt($handle, CURLOPT_HEADER, true);
			curl_setopt($handle, CURLOPT_NOBODY, true);
			
			curl_setopt($handle, CURLOPT_VERBOSE, true);
			
			curl_setopt($handle, CURLOPT_BINARYTRANSFER, true);
			curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
			
			curl_setopt($handle, CURLOPT_SSL_VERIFYHOST, false);
			curl_setopt($handle, CURLOPT_SSL_VERIFYPEER, false); 
			
			curl_setopt($handle, CURLOPT_TIMEOUT, $timeout);
			curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, $connect_timeout);
			
			if($follow_location)
			{
				curl_setopt($handle, CURLOPT_FOLLOWLOCATION, true);
				curl_setopt($handle, CURLOPT_MAXREDIRS, $max_redirs);
			}
			
			$headers = curl_exec($handle);
			
			if(curl_errno($handle) !== 0)
			{
				return (object) array(
					"error" => (object) array(
						"no" => curl_errno($handle),
						"message" => curl_error($handle)
					)
				);
			}
			
			$headers = explode("\n", trim($headers, "\n"));
			
			$status = null;
			
			foreach($headers as $key => $value)
			{
				if($key > 0)
				{
					if(strlen(trim($value)) <= 0)
					{
						unset($headers[$key]);
					}
					else
					{
						$value = array_map("trim", explode(":", $value));
						
						$headers[str_replace("-", "_", strtolower($value[0]))] = $value[1];
						
						unset($headers[$key]);
					}
				}
				else
				{
					$_tmp = array();
					
					$status = $headers[$key];
					
					$status = explode(" ", $status);
					
					$_tmp["code"] = $status[1];
					$_tmp["protocol"] = $status[0];
					
					unset($status[0], $status[1]);
					
					$_tmp["message"] = implode(" ", $status);
					
					$status = $_tmp;
					
					ksort($status);
					
					unset($_tmp, $headers[$key]);
				}
			}
			
			curl_close($handle);
			
			ksort($headers);
			
			if(isset($headers["content_type"]))
			{
				$_tmp = array_map("trim", explode(";", $headers["content_type"]));
				
				if(isset($_tmp[1]))
				{
					$charset = explode("=", $_tmp[1]);
				}
				
				$content = array(
					"type" => $_tmp[0],
					"charset" => isset($charset) && isset($charset[1]) ? $charset[1] : null
				);
				
				unset($headers["content_type"], $_tmp);
			}
			
			if(isset($headers["content_length"]))
			{
				if(isset($content) == false)
				{
					$content = array();
				}
				
				$content["length"] = $headers["content_length"];
				
				unset($headers["content_length"]);
			}
			
			if(isset($content))
			{
				ksort($content);
			}
			
			unset($headers["status"], $handle, $url, $timeout, $connect_timeout);
			
			return json_decode(json_encode(array(
				"headers" => $headers,
				"content" => $content,
				"status" => $status
			)));
		}
		else
		{
			return false;
		}
	}
	
	function str_icontains($haystack, $needle)
	{
		return (bool) stripos($haystack, $needle) !== false;
	}
	
	function is_image($urls)
	{
		$response = array();
		
		foreach($urls as $url)
		{
			$request = curl_get_headers($url, 5);
			
			if(isset($request->error))
			{
				$response[] = (object) array("url" => $url, "status" => false);
			}
			else
			{
				$types = array(
					"jpg", "jpeg", "jpe", "gif", "png",
					"bmp", "tif", "tiff", "ico"
				);
				
				$is_finded = false;
				
				foreach($types as $type)
				{
					if(str_icontains($request->content->type, $type))
					{
						$is_finded = true;
						
						break;
					}
				}
				
				$response[] = (object) array("url" => $url, "status" => $is_finded);
			}
		}
		
		return $response;
	}
	
	$images = array(
		"https://www.r10.net/",
		"http://i.imgur.com/ZCRXIWB.gif",
		"http://saintx.net/"
	);
	
	$results = is_image($images);
	
	var_dump($results);
	
	/** ÇIKTI:
	
	array(3) {
	  [0]=>
	  object(stdClass)#5 (2) {
		["url"]=>
		string(19) "https://www.r10.net/"
		["status"]=>
		bool(false)
	  }
	  [1]=>
	  object(stdClass)#1 (2) {
		["url"]=>
		string(30) "http://i.imgur.com/ZCRXIWB.gif"
		["status"]=>
		bool(true)
	  }
	  [2]=>
	  object(stdClass)#6 (2) {
		["url"]=>
		string(18) "http://saintx.net/"
		["status"]=>
		bool(false)
	  }
	}
	
	**/