The PHP similar_text() function
As it's name suggests, the PHP similar_text function tells you how similar two strings of text are. The syntax is:
similar_text( $string1, $string2, $percent )
The first two are the strings you want to compare. The percent tells you how accurate, in percentage terms, the match was. This is optional, though, so you can leave it out. Here's an example that tells the user how accurately they entered a username:
$real_username ="Bill Gates";
$user_attempt = "Bill Bates";
$check = similar_text($real_username, $user_attempt, $percent);
print($check) . "<BR>";
print($percent . "% correct");
The above script will print out the following:
9
90% correct
The blank space is counted as a character.