Description
mixed 
mb_substitute_character ( [mixed substrchar] )
     mb_substitute_character() specifies
     substitution character when input character encoding is invalid
     or character code is 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().
    
     substchar : Specify Unicode value as
     integer or specify as string as follows
     
    
     Return Value: If substchar is set, it
     returns TRUE for success, otherwise returns
     FALSE. If substchar is
     not set, it returns Unicode value or
     "none"/"long".
    
     
| Example 1. mb_substitute_character() example | 
<?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();
 ?>
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