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How to use php file_get_contents function

藏色散人Original: 2019-05-25 10:29:215004browse

How to use the php file_get_contents function?

Function: Read the entire file into a string.

Syntax:

file_get_contents ( string $filename [, bool $use_include_path = false [, resource $context [, int $offset = -1 [, int $maxlen ]]]] ) : string

The preferred method for reading the contents of a file into a string. If supported by the operating system, memory mapping technology is also used to enhance performance.

Parameters:

filename	The name of the file to be read.
use_include_path	In PHP 5, FILE_USE_INCLUDE_PATH can be used to trigger include path searches.
context	A valid context resource created using stream_context_create(). If you don’t need to customize the context, you can use NULL to ignore it.
offset	Read the offset starting on the original stream. Remote files do not support lookup (offset). Trying to find on a non-local file may use a smaller offset, but this is unpredictable since it works on a buffered stream.
maxlen	The maximum length of read data. The default reading method is to read to the end of the file. Note that this parameter applies to streams processed by the filter.

Return value:

The function returns the data read or returns FALSE on failure.

php file_get_contents() function usage example

Get the website homepage

<?php
$homepage = file_get_contents(&#39;http://www.example.com/&#39;);
echo $homepage;
?>

Read a part of the file

<?php
// Read 14 characters starting from the 21st character
$section = file_get_contents(&#39;./people.txt&#39;, NULL, NULL, 20, 14);
var_dump($section);
?>

In the included Search in path

<?php
// <= PHP 5
$file = file_get_contents(&#39;./people.txt&#39;, true);
// > PHP 5
$file = file_get_contents(&#39;./people.txt&#39;, FILE_USE_INCLUDE_PATH);
?>

Use context

<?php
// Create a stream
$opts = array(
  &#39;http&#39;=>array(
    &#39;method&#39;=>"GET",
    &#39;header&#39;=>"Accept-language: en\r\n" .
              "Cookie: foo=bar\r\n"
  )
);

$context = stream_context_create($opts);

// Open the file using the HTTP headers set above
$file = file_get_contents(&#39;http://www.example.com/&#39;, false, $context);
?>

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