strcasecmp

Description

Returns < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are equal.

<?php
$var1 = "Hello";
$var2 = "hello";
if (strcasecmp($var1, $var2) == 0) {
    echo '$var1 is equal to $var2 in a case-insensitive string comparison';
}
?>

See also preg_match(), strcmp(), substr(), stristr(), strncasecmp(), and strstr().