Only basic entities substitution is supported for multi-byte encodings other than UTF-8; functionality is equivalent to htmlspecialchars

Description

When passing a valid encoding to htmlentities(), but that is not supported, a warning is displayed, and an empty string is returned. This contrasts with the behavior when the encoding is not recognized, where PHP defaults to UTF-8, and returns something non empty.

Example

<?php

    var_dump( htmlentities("Café & 'quotes' and € euro", ENT_QUOTES, 'Big5') );
    // '', empty string

?>

Solutions

• Check that the used encoding is supported.

Changed Behavior

This error may appear following an evolution in behavior, in previous versions. See ` <https://php-changed-behaviors.readthedocs.io/en/latest/behavior/.html>`_.