file_put_contents — Write a string to a file
( string $filename
, mixed $data
[, int $flags = 0
[, resource $context
If filename does not exist, the file is created.
Otherwise, the existing file is overwritten, unless the
FILE_APPEND flag is set.
Path to the file where to write the data.
The data to write. Can be either a string, an
array or a stream resource.
If data is a stream resource, the
remaining buffer of that stream will be copied to the specified file.
This is similar with using stream_copy_to_stream().
You can also specify the data parameter as a single
dimension array. This is equivalent to
file_put_contents($filename, implode('', $array)).
The value of flags can be any combination of
the following flags, joined with the binary OR (|)
Search for filename in the include directory.
See include_path for more
If file filename already exists, append
the data to the file instead of overwriting it.
Acquire an exclusive lock on the file while proceeding to the
A valid context resource created with
The function returns the number of bytes that were written to the file, or
FALSE on failure.
This function may
return Boolean FALSE, but may also return a non-Boolean value which
evaluates to FALSE, such as 0 or
"". Please read the section on Booleans for more
information. Use the ===
operator for testing the return value of this
Example #1 Simple usage example
$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
Example #2 Using flags
$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);
Added context support
Added support for LOCK_EX and the ability to pass
a stream resource to the data parameter
Note: This function is
A URL can be used as a
filename with this function if the fopen wrappers have been enabled.
See fopen() for more details on how to specify the
filename. See the Supported Protocols and Wrappers for links to information
about what abilities the various wrappers have, notes on their usage,
and information on any predefined variables they may