Chuỗi - So sánh chuỗi trong php

<?php
echo strcmp("Hello","Hello");
echo "<br>";
echo strcmp("Hello","hELLo");
?>

Kết Quả : 
0
-1

<?php
echo strcmp("Hello world!","Hello world!")."<br>"; // the two strings are equal
echo strcmp("Hello world!","Hello")."<br>"; // string1 is greater than string
2
echo strcmp("Hello world!","Hello world! Hello!")."<br>"; // string1 is less than string2 ?>

Kết Quả : 
0
7
-7