<?php
$var1 = "Hello";
$var2 = "hello";
if (strcmp($var1, $var2) !== 0) {
echo '$var1 is not equal to $var2 in a case sensitive string comparison';
}
?>
//In php to compare two string we can use strcmp() function
Syntax
strcmp(string1,string2);
//If both string is same then it will return 0
<?php
echo strcmp("Hello world!","Hello world!");
?>