Compare the similarity of two strings through PHP's similar_text function

Compare the similarity of two strings through PHP's similar_text function

$word2compare = "stupid";

$words = array(
 'stupid',
 'stu and pid',
 'hello',
 ' foobar',
 'stpid',
 'upid',
 'stuuupid',
 'sstuuupiiid',
);

while(list($id, $str) = each($words)){
 similar_text($ str, $word2compare, $percent);
 print "Comparing '$word2compare' with '$str': ";
 print round($percent) . "%n";
}

/*
Results:

Comparing 'stupid' with 'stupid': 100%
Comparing 'stupid' with 'stu and pid': 71%
Comparing 'stupid' with 'hello': 0%
Comparing 'stupid' with 'foobar': 0% 'stupid' with 'stpid': 91%
Comparing 'stupid' with 'upid': 80%
Comparing 'stupid' with 'stuuupid': 86%
Comparing 'stupid' with 'sstuuupiiid': 71%

php, similar