file_put_contents

(PHP 5, PHP 7)

file_put_contents — Write a string to a file

설명

int file_put_contents ( string $filename , mixed $data [, int $flags = 0 [, resource $context ]] )

This function is identical to calling fopen(), fwrite() and fclose() successively to write data to a file.

If filename does not exist, the file is created. Otherwise, the existing file is overwritten, unless the FILE_APPEND flag is set.

인수

filename

Path to the file where to write the data.

data

The data to write. Can be either a string, an array or a stream resource.

If data is a stream resource, the remaining buffer of that stream will be copied to the specified file. This is similar with using stream_copy_to_stream().

You can also specify the data parameter as a single dimension array. This is equivalent to file_put_contents($filename, implode('', $array)).

flags

The value of flags can be any combination of the following flags, joined with the binary OR (|) operator.

**Available flags**
Flag	Description
`FILE_USE_INCLUDE_PATH`	Search for `filename` in the include directory. See include_path for more information.
`FILE_APPEND`	If file `filename` already exists, append the data to the file instead of overwriting it.
`LOCK_EX`	Acquire an exclusive lock on the file while proceeding to the writing. In other words, a flock() call happens between the fopen() call and the fwrite() call. This is not identical to an fopen() call with mode "x".

context

A valid context resource created with stream_context_create().

반환값

This function returns the number of bytes that were written to the file, or FALSE on failure.

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.

예제

Example #1 Simple usage example


<?php
$file = 'people.txt';
// Open the file to get existing content
$current = file_get_contents($file);
// Append a new person to the file
$current .= "John Smith\n";
// Write the contents back to the file
file_put_contents($file, $current);
?>

Example #2 Using flags


<?php
$file = 'people.txt';
// The new person to add to the file
$person = "John Smith\n";
// Write the contents to the file, 
// using the FILE_APPEND flag to append the content to the end of the file
// and the LOCK_EX flag to prevent anyone else writing to the file at the same time
file_put_contents($file, $person, FILE_APPEND | LOCK_EX);
?>

변경점

버전	설명
5.1.0	Added support for `LOCK_EX` and the ability to pass a stream resource to the `data` parameter

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.

참고

fopen() - Opens file or URL
fwrite() - Binary-safe file write
file_get_contents() - Reads entire file into a string
stream_context_create() - Creates a stream context

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User Contributed Notes 19 notes

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130

TrentTompkins at gmail dot com ¶

16 years ago


File put contents fails if you try to put a file in a directory that doesn't exist. This creates the directory.

<?php
    function file_force_contents($dir, $contents){
        $parts = explode('/', $dir);
        $file = array_pop($parts);
        $dir = '';
        foreach($parts as $part)
            if(!is_dir($dir .= "/$part")) mkdir($dir);
        file_put_contents("$dir/$file", $contents);
    }
?>

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justin dot carlson at gmail dot com ¶

13 years ago


It should be obvious that this should only be used if you're making one write, if you are writing multiple times to the same file you should handle it yourself with fopen and fwrite, the fclose when you are done writing.

Benchmark below:

file_put_contents() for 1,000,000 writes - average of 3 benchmarks:

 real 0m3.932s
 user 0m2.487s
 sys 0m1.437s

fopen() fwrite() for 1,000,000 writes, fclose() -  average of 3 benchmarks:

 real 0m2.265s
 user 0m1.819s
 sys 0m0.445s

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Anonymous ¶

2 years ago


A more simplified version of the method that creates subdirectories:

function path_put_contents($filePath, $contents, $flags = 0) {

    if (! is_dir($dir = implode('/', explode('/', $filePath, -1))))
        mkdir($dir, 0777, true);
    file_put_contents($filePath, $contents, $flags);
}

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maksam07 at gmail dot com ¶

5 years ago


A slightly simplified version of the method: http://php.net/manual/ru/function.file-put-contents.php#84180

<?php 
function file_force_contents( $fullPath, $contents, $flags = 0 ){
    $parts = explode( '/', $fullPath );
    array_pop( $parts );
    $dir = implode( '/', $parts );
    
    if( !is_dir( $dir ) )
        mkdir( $dir, 0777, true );
    
    file_put_contents( $fullPath, $contents, $flags );
}

file_force_contents( ROOT.'/newpath/file.txt', 'message', LOCK_EX );
?>

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deqode at felosity dot nl ¶

14 years ago


Please note that when saving using an FTP host, an additional stream context must be passed through telling PHP to overwrite the file.



<?php

 /* set the FTP hostname */

 $user = "test";

 $pass = "myFTP";

 $host = "example.com";

 $file = "test.txt";

 $hostname = $user . ":" . $pass . "@" . $host . "/" . $file;



 /* the file content */

 $content = "this is just a test.";

 

 /* create a stream context telling PHP to overwrite the file */

 $options = array('ftp' => array('overwrite' => true));

 $stream = stream_context_create($options);

 

 /* and finally, put the contents */

 file_put_contents($hostname, $content, 0, $stream);

?>

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chris at ocportal dot com ¶

11 years ago


It's important to understand that LOCK_EX will not prevent reading the file unless you also explicitly acquire a read lock (shared locked) with the PHP 'flock' function.

i.e. in concurrent scenarios file_get_contents may return empty if you don't wrap it like this:

<?php
$myfile=fopen('test.txt','rt');
flock($myfile,LOCK_SH);
$read=file_get_contents('test.txt');
fclose($myfile);
?>

If you have code that does a file_get_contents on a file, changes the string, then re-saves using file_put_contents, you better be sure to do this correctly or your file will randomly wipe itself out.

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egingell at sisna dot com ¶

18 years ago


In reply to the previous note:

If you want to emulate this function in PHP4, you need to return the bytes written as well as support for arrays, flags.

I can only figure out the FILE_APPEND flag and array support. If I could figure out "resource context" and the other flags, I would include those too.

<?

define('FILE_APPEND', 1);
function file_put_contents($n, $d, $flag = false) {
    $mode = ($flag == FILE_APPEND || strtoupper($flag) == 'FILE_APPEND') ? 'a' : 'w';
    $f = @fopen($n, $mode);
    if ($f === false) {
        return 0;
    } else {
        if (is_array($d)) $d = implode($d);
        $bytes_written = fwrite($f, $d);
        fclose($f);
        return $bytes_written;
    }
}

?>

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aabaev arroba gmail coma com ¶

8 years ago


I suggest to expand file_force_contents() function of TrentTompkins at gmail dot com by adding verification if patch is like: "../foo/bar/file"

if (strpos($dir, "../") === 0)
    $dir = str_replace("..", substr(__DIR__, 0, strrpos(__DIR__, "/")), $dir);

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Anonymous ¶

7 years ago


Make sure not to corrupt anything in case of failure.

<?php

function file_put_contents_atomically($filename, $data, $flags = 0, $context = null) {
    if (file_put_contents($filename."~", $data, $flags, $context) === strlen($contents)) {
        return rename($filename."~",$filename,$context);
    }

    @unlink($filename."~", $context);
    return FALSE;
}

?>

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aidan at php dot net ¶

20 years ago


This functionality is now implemented in the PEAR package PHP_Compat.

More information about using this function without upgrading your version of PHP can be found on the below link:

http://pear.php.net/package/PHP_Compat

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vaneatona at gmail dot com ¶

7 years ago


I'm updating a function that was posted, as it would fail if there was no directory. It also returns the final value so you can determine if the actual file was written.

    public static function file_force_contents($dir, $contents){
        $parts = explode('/', $dir);
        $file = array_pop($parts);
        $dir = '';

        foreach($parts as $part) {
            if (! is_dir($dir .= "{$part}/")) mkdir($dir);
        }

        return file_put_contents("{$dir}{$file}", $contents);
    }

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ravianshmsr08 at gmail dot com ¶

14 years ago


To upload file from your localhost to any FTP server.

pease note 'ftp_chdir' has been used instead of putting direct remote file path....in ftp_put ...remoth file should be only file name



<?php

$host = '*****';

$usr = '*****';

$pwd = '**********';         

$local_file = './orderXML/order200.xml';

$ftp_path = 'order200.xml';

$conn_id = ftp_connect($host, 21) or die ("Cannot connect to host");      

ftp_pasv($resource, true);

ftp_login($conn_id, $usr, $pwd) or die("Cannot login");

// perform file upload

ftp_chdir($conn_id, '/public_html/abc/'); 

$upload = ftp_put($conn_id, $ftp_path, $local_file, FTP_ASCII);

if($upload) { $ftpsucc=1; } else { $ftpsucc=0; }

// check upload status:

print (!$upload) ? 'Cannot upload' : 'Upload complete';

print "\n";

// close the FTP stream

ftp_close($conn_id);

?>

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curda222 at gmail dot com ¶

11 months ago


An improved and enraptured code from TrentTompkins at gmail dot com  

Note: Added error response 
Note: Added directory detection
Note: Added root detection
Note: Added permissions when creating folder

function file_force_contents($dir, $contents, $flags = 0){
    if (strpos($dir, "../") === 0){
        $dir = str_replace("..", substr(__DIR__, 0, strrpos(__DIR__, "/")), $dir);
    }
    $parts = explode('/', $dir);
    if(is_array($parts)){
        $file = array_pop($parts);
        $dir = '';
        foreach($parts as $part)
            if(!is_dir($dir .= "/$part")){
                mkdir($dir, 0777, true);
            }
            if(file_put_contents("$dir/$file", $contents, $flags) === false ){
            return false;
        }
    }else{
        if(file_put_contents("$dir", $contents, $flags) === false ){
            return false;
        } 
    }
}

-Oliver Leuyim Angel

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gurjindersingh at SPAM dot hotmail dot com ¶

10 years ago


File put contents fails if you try to put a file in a directory that doesn't exist. This function creates the directory.
 
i have updated code of "TrentTompkins at gmail dot com". thanks
<?php
/**
 * @param string $filename <p>file name including folder. 
 * example :: /path/to/file/filename.ext or filename.ext</p>
 * @param string $data <p> The data to write.
 * </p>
 * @param int $flags same flags used for file_put_contents.
 * more info: http://php.net/manual/en/function.file-put-contents.php
 * @return bool <b>TRUE</b> file created succesfully <br> <b>FALSE</b> failed to create file.
 */
function file_force_contents($filename, $data, $flags = 0){
    if(!is_dir(dirname($filename)))
        mkdir(dirname($filename).'/', 0777, TRUE);
    return file_put_contents($filename, $data,$flags);
}
// usage

file_force_contents('test1.txt','test1 content');  // test1.txt created

file_force_contents('test2/test2.txt','test2 content'); 
// test2/test2.txt created "test2" folder.  

file_force_contents('~/test3/test3.txt','test3 content'); 
// /path/to/user/directory/test3/test3.txt created "test3" folder in user directory (check on linux "ll ~/ | grep test3").  
?>

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Brandon Lockaby ¶

13 years ago


Calling file_put_contents within a destructor will cause the file to be written in SERVER_ROOT...

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vahkos at mail dot ru ¶

12 years ago


file_put_contents does not issue an error message if file name is incorrect(for example has improper symbols on the end of it /n,/t)

that is why use trim() for file name.

$name=trim($name);

file_put_contents($name,$content);

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error at example dot com ¶

14 years ago


It's worth noting that you must make sure to use the correct path when working with this function. I was using it to help with logging in an error handler and sometimes it would work - while other times it wouldn't. In the end it was because sometimes it was called from different paths resulting in a failure to write to the log file.

__DIR__ is your friend.

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John Galt ¶

15 years ago


I use file_put_contents() as a method of very simple hit counters. These are two different examples of extremely simple hit counters, put on one line of code, each.

Keep in mind that they're not all that efficient. You must have a file called counter.txt with the initial value of 0.

For a text hit counter:
<?php
 $counter = file_get_contents("counter.txt"); $counter++; file_put_contents("counter.txt", $counter); echo $counter;
?>

Or a graphic hit counter:
<?php
 $counter = file_get_contents("counter.txt"); $counter++; file_put_contents("counter.txt", $counter); for($i = 0; $i < strlen($counter); $i++) echo "<img src=\"counter/".substr($counter, $i, 1).".gif\" alt=\"".substr($counter, $i, 1)."\" />";
?>

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wjsams at gmail dot com ¶

15 years ago


file_put_contents() strips the last line ending

If you really want an extra line ending at the end of a file when writing with file_put_contents(), you must append an extra PHP_EOL to the end of the line as follows.

<?php
$a_str = array("these","are","new","lines");
$contents = implode(PHP_EOL, $a_str);
$contents .= PHP_EOL . PHP_EOL;
file_put_contents("newfile.txt", $contents);
print("|$contents|");
?>

You can see that when you print $contents you get two extra line endings, but if you view the file newfile.txt, you only get one.

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