Check if string starts with php code example

Example 1: php string starts with

//php check if first four characters of a string = http
substr( $http, 0, 4 ) === "http";
//php check if first five characters of a string = https
substr( $https, 0, 5 ) === "https";

Example 2: Check if string starts with php

substr( $string_n, 0, 4 ) === "http"