Identical to calling fopen(), fwrite(), and fclose() successively. The function returns the amount of bytes that were written to the file.
flags can take FILE_USE_INCLUDE_PATH and/or FILE_APPEND, however the FILE_USE_INCLUDE_PATH option should be used with caution.
You can also specify the data parameter as an array (not multi-dimension arrays). This is equivalent to file_put_contents($filename, join('', $array)).
As of PHP 5.1.0, you may also pass a stream resource to the data parameter. In result, the remaining buffer of that stream will be copied to the specified file. This is similar with using stream_copy_to_stream().
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See also fopen(), fwrite(), fclose(), and file_get_contents().