mb_substitute_character

Specifies a substitution character when input character encoding is invalid or character code does not exist in output character encoding. Invalid characters may be substituted NULL (no output), string or integer value (Unicode character code value).

This setting affects mb_convert_encoding(), mb_convert_variables(), mb_output_handler(), and mb_send_mail().

Specify the Unicode value as an integer, or as one of the following strings:

• "none": no output
• "long": Output character code value (Example: U+3000, JIS+7E7E)
• "entity": Output character entity (Example: Ȁ)

If substchar is set, it returns TRUE for success, otherwise returns FALSE. If substchar is not set, it returns the current setting.

<?php
/* Set with Unicode U+3013 (GETA MARK) */
mb_substitute_character(0x3013);

/* Set hex format */
mb_substitute_character("long");

/* Display current setting */
echo mb_substitute_character();
?>