(PHP 4, PHP 5)
substr_count — Count the number of substring occurrences
$haystack
   , string $needle
   [, int $offset = 0
   [, int $length
  ]] )
   substr_count() returns the number of times the
   needle substring occurs in the
   haystack string. Please note that
   needle is case sensitive.
  
Note:
This function doesn't count overlapped substrings. See the example below!
haystackThe string to search in
needleThe substring to search for
offsetThe offset where to start counting
length
       The maximum length after the specified offset to search for the
       substring. It outputs a warning if the offset plus the length is
       greater than the haystack length.
      
This function returns an integer.
| Version | Description | 
|---|---|
| 5.1.0 | Added the offsetand
        thelengthparameters | 
Example #1 A substr_count() example
<?php
$text = 'This is a test';
echo strlen($text); // 14
echo substr_count($text, 'is'); // 2
// the string is reduced to 's is a test', so it prints 1
echo substr_count($text, 'is', 3);
// the text is reduced to 's i', so it prints 0
echo substr_count($text, 'is', 3, 3);
// generates a warning because 5+10 > 14
echo substr_count($text, 'is', 5, 10);
// prints only 1, because it doesn't count overlapped substrings
$text2 = 'gcdgcdgcd';
echo substr_count($text2, 'gcdgcd');
?>