经测试代码如下：
/**
* 通过 similar_text函数比较两个字符串的相似性
*
* @param
* @arrange (512.笔记) jb51.cc
**/
$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%
Comparing 'stupid' with 'stpid': 91%
Comparing 'stupid' with 'upid': 80%
Comparing 'stupid' with 'stuuupid': 86%
Comparing 'stupid' with 'sstuuupiiid': 71%
*/
/*** 代码来自编程之家 jb51.cc（jb51.cc） ***/