check if a string starts with a specified string in php

1//php check if first four characters of a string = http
2substr( $http, 0, 4 ) === "http";
3//php check if first five characters of a string = https
4substr( $https, 0, 5 ) === "https";
5

1phpCopy<?php
2  $string = "Mr. Peter";
3  if(strncmp($string, "Mr.", 3) === 0){
4      echo "The string starts with the desired substring.";
5  }else 
6      echo "The string does not start with the desired substring.";
7?>
8

1phpCopy<?php
2  $string = "Mr. Peter";
3  if(substr($string, 0, 3) === "Mr."){
4      echo "The string starts with the desired substring.";
5  }else 
6      echo "The string does not start with the desired substring.";
7?>
8

1phpCopy<?php
2  $string = "Mr. Peter";
3  if(strpos( $string, "Mr." ) === 0){
4      echo "The string starts with the desired substring.";
5  }else 
6      echo "The string does not start with the desired substring.";
7?>
8

1phpCopy<?php
2  $string = "mr. Peter";
3  if(strncasecmp($string, "Mr.", 3) === 0){
4      echo "The string starts with the desired substring.";
5  }else 
6      echo "The string does not start with the desired substring.";
7?>
8