file_get_contents

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

file_get_contents — Reads entire file into a string

설명

string file_get_contents ( string $filename [, bool $use_include_path = false [, resource $context [, int $offset = 0 [, int $maxlen ]]]] )

This function is similar to file(), except that file_get_contents() returns the file in a string, starting at the specified offset up to maxlen bytes. On failure, file_get_contents() will return FALSE.

file_get_contents() is the preferred way to read the contents of a file into a string. It will use memory mapping techniques if supported by your OS to enhance performance.

Note:
If you're opening a URI with special characters, such as spaces, you need to encode the URI with urlencode().

인수

filename

Name of the file to read.

use_include_path

Note:
As of PHP 5 the FILE_USE_INCLUDE_PATH constant can be used to trigger include path search.

context

A valid context resource created with stream_context_create(). If you don't need to use a custom context, you can skip this parameter by NULL.

offset

The offset where the reading starts on the original stream. Negative offsets count from the end of the stream.

Seeking (offset) is not supported with remote files. Attempting to seek on non-local files may work with small offsets, but this is unpredictable because it works on the buffered stream.

maxlen

Maximum length of data read. The default is to read until end of file is reached. Note that this parameter is applied to the stream processed by the filters.

반환값

The function returns the read data 실패 시 FALSE를 반환합니다.

Warning

이 함수는 논리 FALSE를 반환하지만, 논리 FALSE로 취급할 수 있는 다른 값을 반환할 수 있습니다. 자세한 정보는 논리형 섹션을 참고하십시오. 이 함수의 반환값을 확인하려면 === 연산자를 이용하십시오.

오류/예외

An E_WARNING level error is generated if filename cannot be found, maxlength is less than zero, or if seeking to the specified offset in the stream fails.

예제

Example #1 Get and output the source of the homepage of a website


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

Example #2 Searching within the include_path


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

Example #3 Reading a section of a file


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

위 예제의 출력 예시:

string(14) "lle Bjori Ro"

Example #4 Using stream contexts


<?php
// Create a stream
$opts = array(
  'http'=>array(
    'method'=>"GET",
    'header'=>"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('http://www.example.com/', false, $context);
?>

변경점

버전	설명
7.1.0	Support for negative `offset`s has been added.
5.1.0	Added the `offset` and `maxlen` parameters.

주의

Note: 이 함수는 바이너리 안전입니다.

Tip

fopen 래퍼를 활성화하면, 파일명으로 URL을 사용할 수 있습니다. 파일 이름을 지정하는 방법은 fopen()을 참고하십시오. 다양한 래퍼의 기능, 사용법, 제공하는 예약 정의 변수들에 대해서는 Supported Protocols and Wrappers를 참고하십시오.

Warning

SSL을 사용할 때, 마이크로소프트 IIS는 close_notify 식별자를 보내지 않은채 접속을 종료하는 프로토콜 오류가 있습니다. PHP는 데이터의 마지막에 도달했을때, 이를 "SSL: Fatal Protocol Error"로 보고합니다. 이를 처리하기 위해서는 error_reporting 레벨에 경고를 포함하지 않도록 해야합니다. PHP 4.3.7 이후는 https:// 래퍼를 통해 스트림을 열 때, 문제가 있는 IIS 서버 소프트웨어를 검출하여 경고를 하지 않습니다. ssl:// 소켓을 만들기 위해 fsockopen()을 사용한다면, 경고를 직접 검출하여 없애야 합니다.

참고

file() - Reads entire file into an array
fgets() - Gets line from file pointer
fread() - Binary-safe file read
readfile() - Outputs a file
file_put_contents() - Write a string to a file
stream_get_contents() - Reads remainder of a stream into a string
stream_context_create() - Creates a stream context
$http_response_header

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User Contributed Notes 8 notes

down

KC ¶

11 months ago


If doing a negative offset to grab the end of a file and the file is shorter than the offset, then file_get_contents( ) will return false.

If you want it to just return what is available when the file is shorter than the negative offset, you could try again.

For example...

$contents = file_get_contents( $log_file, false, null, -4096 ); // Get last 4KB

if ( false === $contents ) {
    // Maybe error, or maybe file less than 4KB in size.

    $contents = file_get_contents( $log_file, false, null );

    if ( false === $contents ) {
        // Handle real error.
    }
}

down

Bart Friederichs ¶

12 years ago


file_get_contents can do a POST, create a context for that first:



<?php



$opts = array('http' =>

  array(

    'method'  => 'POST',

    'header'  => "Content-Type: text/xml\r\n".

      "Authorization: Basic ".base64_encode("$https_user:$https_password")."\r\n",

    'content' => $body,

    'timeout' => 60

  )

);

                        

$context  = stream_context_create($opts);

$url = 'https://'.$https_server;

$result = file_get_contents($url, false, $context, -1, 40000);



?>

down

daniel at dangarbri dot tech ¶

1 year ago


Note that if an HTTP request fails but still has a response body, the result is still false, Not the response body which may have more details on why the request failed.

down

-2

soger ¶

2 years ago


There's barely a mention on this page but the $http_response_header will be populated with the HTTP headers if your file was a link. For example if you're expecting an image you can do this:

<?php
$data = file_get_contents('https://example.net/some-link');

$mimetype = null;
foreach ($http_response_header as $v) {
    if (preg_match('/^content\-type:\s*(image\/[^;\s\n\r]+)/i', $v, $m)) {
        $mimetype = $m[1];
    }
}

if (!$mimetype) {
    // not an image
}

down

-1

brentcontact at daha dot us ¶

1 year ago


To prevent mixed content most browsers/functions will use the protocol already used if you specify only // instead of http:// or https://. This is not the case with file_get_contents. You must specify the protocol. 

This does not work:
<?php
$jsonData = file_get_contents('//example.com/file.json');
print $jsonData;
?>

Specifying only 'example.com/file.json' without the double slash does not work either.

When running on Apache 2.4 , using $_SERVER['REQUEST_SCHEME'] is a better way to be protocol agnostic.
<?php
$jsonData = file_get_contents($_SERVER['REQUEST_SCHEME'].'://example.com/file.json');
print $jsonData;
?>

If using another web server, you may have to get the protocol another way or hard code it.

down

-22

Anonymous ¶

3 years ago


if the connection is
content-encoding: gzip
and you need to manually ungzip it, this is apparently the key
$c=gzinflate( substr($c,10,-8) );
(stolen from the net)

down

-24

453034559 at qq dot com ¶

3 years ago


//从指定位置获取指定长度的文件内容
function file_start_length($path,$start=0,$length=null){
    if(!file_exists($path)) return false;
    $size=filesize($path);
    if($start<0) $start+=$size;
    if($length===null) $length=$size-$start;
    return file_get_contents($path, false, null, $start, $length );
}

down

-28

allenmccabe at gmail dot com ¶

3 years ago


I'm not sure why @jlh was downvoted, but I verified what he reported.

>>> file_get_contents($path false, null, 5, null)
=> ""
>>> file_get_contents($path, false, null, 5, 5)
=> "r/bin"

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