Example of a string comparison function strcmp () in PHP

int strcmp (String $str 1, String $str 2)

Compare in binary mode
Case-sensitive when compared to this function
The return value if STR1 is less than str2 returns <0 if STR1 is greater than str2 returns >0 if the two equals return 0.

<?php    $str 1 = "Hello World";    $str 1 equals the value of $str3    $str 2 = "HELLO World";    $str 3 = "Hello World";    $str 1 is equal to the value of $STR3    echo strcmp ($str 1, $str 2);    Output 1    echo strcmp ($str 2, $str 1);    Output-1    echo strcmp ($str 1, $str 3);    Output 0?>

There is also a function strcasecmp (), the usage is similar to the strcmp (), but is not case-insensitive, here no longer wordy