mb_substr_count
    (PHP 4 >= 4.3.0, PHP 5)
mb_substr_count -- Count the number of substring occurrences
Description
int 
mb_substr_count ( string haystack, string needle [, string encoding])
     mb_substr_count() returns the number of times the
     needle substring occurs in the
     haystack string.
    
     encoding specifies the encoding for
     needle and haystack.
     If omitted, internal character encoding is used.
    
     
Example 1. mb_substr_count() example 
<?php echo mb_substr_count("This is a test", "is"); // prints out 2 ?>
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     See also substr_count(),
     mb_strpos(), mb_substr().