Example of string comparison function strcmp() in php

int strcmp (string $str1, string $str2)

Compare in binary mode
Comparison with this function is case-sensitive
Return value, if str1 If it is less than str2, it returns <0. If str1 is greater than str2, it returns >0. If they are equal, it returns 0.

<?php    
    $str1 = "hello world";    //$str1与$str3的值相等
    $str2 = "HELLO WORLD";    
    $str3 = "hello world";    //$str1与$str3的值相等

    echo strcmp($str1,$str2);    //输出1
    echo strcmp($str2,$str1);    //输出-1
    echo strcmp($str1,$str3);    //输出0
?>

There is also a function strcasecmp(), the usage is similar to strcmp(), except that it is not case-sensitive, so I won’t go into details here

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