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Count the number of substring occurrences (PHP 4 >= 4.3.0, PHP 5)
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 1409. mb_substr_count() example

echo mb_substr_count("This is a test", "is"); // prints out 2

See also substr_count(), mb_strpos(), mb_substr().