PHP处理Socket连接超时问题的方法

当使用php函数 file_get_contents抓取远程网页时，如果连接超时将会输出一个Fatal Error，结果导致下面的代码不能运行，一般可采取两个解决方案：

1. 利用file_get_contents()第三个参数

<?php
	$url = "http://172.16.0.40/die.php";
  $ctx = stream_context_create(array(
    'http' => array('timeout' => 10)
    )
	);
	$result = @file_get_contents($url, 0, $ctx);
	if($result){
		var_dump($result);
	}else{
		echo " Buffer is empty";
	}
?>

2. 使用curl扩展库

<?php
	$url = "http://172.16.0.40/die.php";

  try {
		echo date('Y-m-d h:i:s');
		echo "<br/>";
		//$buffer = file_get_contents($url);
		$buffer = joy_file_get_contents($url);
		echo date('Y-m-d h:i:s');
		if(empty($buffer)) {
			echo " Buffer is empty";
		} else {
			echo " Buffer is not empty";
		}
	} catch(Exception $e) {
	  echo "error ";
	}

	function joy_file_get_contents($url, $second = 5){
		$ch = curl_init();
		curl_setopt($ch,CURLOPT_URL,$url);
		curl_setopt($ch,CURLOPT_HEADER,0);
		curl_setopt($ch,CURLOPT_TIMEOUT,$second);
		curl_setopt($ch,CURLOPT_RETURNTRANSFER, true);

		$content = curl_exec($ch);
		curl_close($ch);
		return $content;
	}
?>