Returns part of
haystack string from the
first occurrence of
needle to the end of
needle is not found, returns FALSE.
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
haystack, use the faster and less memory intensive function strpos() instead.
strstr() has been binary safe since PHP 4.3.0