how to get first position places in php code example

Example 1: php needle haystack

//Find the position of the first occurrence of a substring in a string
$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

Example 2: strpos

strpos ( string $haystack , mixed $needle [, int $offset = 0 ] ) : int