(No version information available, might be only in CVS)
unicode_set_subst_char — Set the substitution character for string conversion errors
When converting a string from or to unicode, an invalid or unconvertable character may be encountered. When the conversion error mode is set to U_CONV_ERROR_SUBST, the character that caused the error is substituted by a character set by this function. The default substitution character is ?.
The substitution character to use.
Returns TRUE on success or FALSE on failure.
Emits a E_WARNING level error if character is invalid.
This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.