public static Unicode::strpos($haystack, $needle, $offset = 0)
Finds the position of the first occurrence of a string in another string.
Parameters
string $haystack: The string to search in.
string $needle: The string to find in $haystack.
int $offset: If specified, start the search at this number of characters from the beginning (default 0).
Return value
int|false The position where $needle occurs in $haystack, always relative to the beginning (independent of $offset), or FALSE if not found.