Find the first occurrence of a string
strstr ( string $haystack , mixed $needle [, bool $before_needle = FALSE ] ) : string
The input string.
If needle is not a string, it is converted to an integer and applied as the ordinal value of a character. This behavior is deprecated as of PHP 7.3.0, and relying on it is highly discouraged. Depending on the intended behavior, the needle should either be explicitly cast to string, or an explicit call to chr() should be performed.
If TRUE, strstr() returns the part of the haystack before the first occurrence of the needle (excluding the needle).
Returns the portion of string, or FALSE if needle is not found.
HAYSTACK NEEDLE | STRING
HAYSTACK NEEDLE | CHR