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Editor to share with you how to use the file_get_contents () function in PHP, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Definition and usage

The file_get_contents () function reads the entire file into a string.

Like file (), the difference is that file_get_contents () reads the file into a string.

The file_get_contents () function is the preferred method for reading the contents of a file into a string. If the operating system supports it, memory mapping techniques are also used to enhance performance.

Grammar

Description of file_get_contents (path,include_path,context,start,max_length) parameters

Path is required. Specifies the file to be read.

Include_path is optional. If you also want to search for files in include_path, you can set this parameter to "1".

Context is optional. Specifies the environment of the file handle.

Context is a set of options that can modify the behavior of the flow. If null is used, ignore it.

Start is optional. Specifies where to start reading in the file. This parameter is new to PHP 5.1.

Max_length is optional. Specifies the number of bytes to read. This parameter is new to PHP 5.1.

Description

Support for context was added by PHP 5.0.0.

There are generally two solutions for timeouts or slow pages:

one。 Using the third parameter of file_get_contents ()

The code is as follows:

$url = "http://zhoz.com/zhoz.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"

}

? >

This method 1, I have been tested in the local response is good, but if the external network test (environment: China → between American servers) is basically a timeout situation.

Testing TimeOut is basically useless, the following ways are recommended

two。 Use the curl extension library

The copy code is as follows:

$url = "http://zhoz.com/zhoz.php";

Try {

Echo date ('Y-m-d HRV iRanger s')

Echo ""

/ / $buffer = file_get_contents ($url)

$buffer = zhoz_get_contents ($url)

Echo date ('Y-m-d HRV iRanger s')

If (emptyempty ($buffer)) {

Echo "Buffer is empty"

} else {

Echo "Buffer is not empty"

}

} catch (Exception $e) {

Echo "error"

}

Function zhoz_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

}

? >

In summary, choose which method to apply according to the system environment:

The code is as follows:

Function vita_get_url_content ($url) {

If (function_exists ('file_get_contents')) {

$file_contents = file_get_contents ($url)

} else {

$ch = curl_init ()

$timeout = 5

Curl_setopt ($ch, CURLOPT_URL, $url)

Curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1)

Curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout)

$file_contents = curl_exec ($ch)

Curl_close ($ch)

}

Return $file_contents

}

? >

These are all the contents of the article "how to use the file_get_contents () function in PHP". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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