substr_count
    (PHP 4 , PHP 5)
substr_count -- Count the number of substring occurrences
Description
int 
substr_count ( string haystack, string needle)
     substr_count() returns the number of times the
     needle substring occurs in the
     haystack string. Please note that
     needle is case sensitive.
    
     
Example 1. substr_count() example 
<?php echo substr_count("This is a test", "is"); // prints out 2 ?>
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     See also count_chars(),
     strpos(), substr(),
     and strstr().