... 3.0.2 - 3.0.18 only, PHP 4 >= 4.0.0) strcasecmp -- Binary safe case-insensitive string comparison . int strcasecmp ( string str1, string str2) . Returns < 0 if str1 is less than str2 ; > 0 if str1 is greater than str2 , and 0 if they are equal. Example 1. strcasecmp() example . var1 = "Hello"; $var2 = "hello"; if (!strcasecmp($var1, $var2)) { echo '$var1 is equal to $var2 in a case-insensitive string comparison'; } . ...