Solution to PHP request remote address setting timeout

This article mainly introduces the solution to setting the timeout for PHP requesting remote addresses. Interested friends can refer to it. I hope it will be helpful to everyone.

php requests a remote address to set the timeout. It mainly explains how to set the timeout for three simple common functions: file_get_contents, fopen, and curl. Generally, it is recommended to use curl, which has the best performance and the highest efficiency.

1. file_get_contents request timeout setting

$timeout = array(
'http'=> array(
'timeout'=>5//设置一个超时时间，单位为秒
)
);
$ctx = stream_context_create($timeout);
$text = file_get_contents("http://www.jb51.net/",0, $ctx);

2. fopen request timeout setting

$timeout = array(
'http' => array(
'timeout' => 5 //设置一个超时时间，单位为秒
)
);
$ctx = stream_context_create($timeout);
if ($fp = fopen("http://www.jb51.net/", "r", false, $ctx)) {
while( $c = fread($fp, 8192)) {
echo $c;
}
fclose($fp);
}

3. curl request timeout Setting

CURL is a commonly used lib library for accessing the HTTP protocol interface. It has high performance and has some concurrency support functions.

curl_setopt($ch, opt) You can set some timeout settings, mainly including:

a, CURLOPT_TIMEOUT sets the maximum number of seconds that cURL is allowed to execute.

b. CURLOPT_TIMEOUT_MS sets the maximum number of milliseconds that cURL is allowed to execute.

c. CURLOPT_CONNECTTIMEOUT The time to wait before initiating a connection. If set to 0, it will wait indefinitely.

d. CURLOPT_CONNECTTIMEOUT_MS The time to wait for a connection attempt, in milliseconds. If set to 0, wait infinitely. e. CURLOPT_DNS_CACHE_TIMEOUT sets the time to save DNS information in memory, the default is 120 seconds.

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_TIMEOUT,60);  //只需要设置一个秒的数量就可以
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_USERAGENT, $defined_vars['HTTP_USER_AGENT']);

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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