Descrizione

file_put_contents(
    string $filename,
    mixed $data,
    int $flags = 0,
    ?resource $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.

Elenco dei parametri

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

**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().

Valori restituiti

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

Avviso

Questa funzione può restituire il Booleano false, ma può anche restituire un valore non-Booleano valutato come false. Fare riferimento alla sezione Booleans per maggiori informazioni. Usare l'operatore === per controllare il valore restituito da questa funzione.

Esempi

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);
?>

Note

Nota: Questa funzione è binary-safe (gestisce correttamente i file binari)

Suggerimento

È possibile utilizzare una URL come un nome di file con questa funzione se fopen wrappers è stata abilitata. Vedere fopen() per maggiori informazioni su come specificare i nomi di file. Vedere Supported Protocols and Wrappers per i link verso le informazioni sulle capacità dei vari wrapper, note sul loro uso, informazioni sulle variabili predefinite che forniscono.

Vedere anche:

fopen() - Apre un file o un URL
fwrite() - Scrittura su file binary-safe
file_get_contents() - Legge un file all'interno di una stringa
stream_context_create() - Creates a stream context