Descriptionstring strstr ( string haystack, string needle)
Returns part of haystack string from the first occurrence of needle to the end of haystack.
If needle is not found, returns FALSE.
If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
Note: This function is case-sensitive. For case-insensitive searches, use stristr().
Note: If you only want to determine if a particular needle occurs within haystack, use the faster and less memory intensive function strpos() instead.