php file_get_contents data collection and common problem solving

php file_get_contents data collection and common problem solving_PHP tutorial

WBOY

Release： 2016-07-13 10:44:45

Original

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The file_get_contents function is rarely used in batch data collection in PHP, but if it is a small amount, we can use the file_get_contents function, because it is not only easy to use but also easy to learn. Let me introduce the usage and use of file_get_contents Problem solving in the process.

Let’s look at the problem first

file_get_contents cannot obtain the URL with port

For example:

代码如下	复制代码
file_get_contents('http://localhost:12345');

Nothing gained.

The solution is: turn off selinux

1 Permanent method – need to restart the server

Modify the /etc/selinux/config file to set SELINUX=disabled, and then restart the server.

2 Temporary method – Set system parameters

Use command setenforce 0

Attachment:
setenforce 1 Set SELinux to enforcing mode
setenforce 0 Set SELinux to permissive mode

file_get_contents timeout

The code is as follows

Copy code

代码如下

复制代码

function _file_get_contents($url)
{
  $context = stream_context_create(array(
     'http' => array(
      'timeout' => 180 //超时时间，单位为秒
     )
  ));
  return @file_get_contents($url, 0, $context);

}

function _file_get_contents($url) { $context = stream_context_create(array( 'http' => array( 'timeout' => 180 //Timeout time, unit is seconds ) ) )); Return @file_get_contents($url, 0, $context); }

After the above problems are solved, we can start collecting.

代码如下

复制代码

//全国，判断条件是$REQUEST_URI是否含有html
if (!strpos($_SERVER["REQUEST_URI"],".html"))
{
$page="http://qq.ip138.com/weather/";
$html = file_get_contents($page,'r');
$pattern="/全国主要城市、县当天和未来五天天气趋势预报在线查询(.*?)/si";
//正则匹配之间的html
preg_match($pattern,$html,$pg);
echo "";
//正则替换远程地址为本地地址
$p=preg_replace('//weather/(w+)/index.htm/', 'tq.php/.html', $pg[1]);
echo $p;
}
//省，判断条件是$REQUEST_URI是否含有？
else if(!strpos($_SERVER["REQUEST_URI"],"?")){
//yoyo推荐的使用分割获得数据，这里是获得省份名称
$province=explode("/",$_SERVER["REQUEST_URI"]);
$province=explode(".",$province[count($province)-1]);
$province=$province[0];
//被注释掉的是我自己写出来的正则，感觉写的不好，但效果等同上面
//preg_match('/[^/]+[.(html)]$/',$_SERVER["REQUEST_URI"],$pro);
//$province=preg_replace('/.html/','',$pro[0]);
$page="http://qq.ip138.com/weather/".$province."/index.htm";
//获取html数据之前先尝试打开页面，防止恶意输入地址导致出错
if (!@fopen($page, "r")) {
die("对不起，该地址不存在!点击这里返回");
exit(0);
}
$html = file_get_contents($page,'r');
$pattern="/五天天气趋势预报(.*?)请输入输入市/si";
preg_match($pattern,$html,$pg);
echo "";
//正则替换，获取省份，城市
$p=preg_replace('//weather/(w+)/(w+).htm/', '.html?pro=', $pg[1]);
echo $p;
}
else {
//市，通过get传递省份
$pro=$_REQUEST['pro'];
$city=explode("/",$_SERVER["REQUEST_URI"]);
$city=explode(".",$city[count($city)-1]);
$city=$city[0];
//preg_match('/[^/]+[.(html)]+[?]/',$_SERVER["REQUEST_URI"],$cit);
//$city=preg_replace('/.html?/','',$cit[0]);
$page="http://qq.ip138.com/weather/".$pro."/".$city.".htm";
if (!@fopen($page, "r")) {
die("对不起，该地址不存在!点击这里返回");
exit(0);
}
$html = file_get_contents($page,'r');
$pattern="/五天天气趋势预报(.*?)请输入输入市/si";
preg_match($pattern,$html,$pg);
echo "";
//获取真实的图片地址
$p=preg_replace('//image//', 'http://qq.ip138.com/image/', $pg[1]);
echo $p;
}
?>

If the above method cannot collect the data, we can use it to process it

代码如下

复制代码

$url = "http://www.bKjia.c0m ";
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
//在需要用户检测的网页里需要增加下面两行
//curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
//curl_setopt($ch, CURLOPT_USERPWD, US_NAME.":".US_PWD);
$contents = curl_exec($ch);
curl_close($ch);
echo $contents;
?>