PHP 5, PHP 7, PHP 8
file_put_contents - Write data to a file

     [int$flags = 0],
     [resource|null$context = null]
): int|false

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.



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 (|) 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".


A valid context resource created with stream_context_create.

Return Values

This 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. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.



This function is binary-safe.

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 for links to information about what abilities the various wrappers have, notes on their usage, and information on any predefined variables they may provide.

Related Functions

Example of file_put_contents

Show all examples for file_put_contents

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