(PHP 4 >= 4.4.3, PHP 5 >= 5.1.3, PHP 7, PHP 8)

mb_check_encodingCheck if strings are valid for the specified encoding


mb_check_encoding(array|string|null $value = null, ?string $encoding = null): bool

Checks if the specified byte stream is valid for the specified encoding. If value is of type array, all keys and values are validated recursively. It is useful to prevent so-called "Invalid Encoding Attack".

Elenco dei parametri


The byte stream or array to check. If it is omitted, this function checks all the input from the beginning of the request.


As of PHP 8.1.0, omitting this parameter or passing null is deprecated.


The expected encoding.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Log delle modifiche

Versione Descrizione
8.1.0 Calling this function with null as value or without argument is deprecated.
8.0.0 value and encoding are nullable now.
7.2.0 This function now also accepts an array as value. Formerly, only strings have been supported.
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