摘要：
(1)字符串的比较“==”或者“===”strcmp(A,B) 或者strcasecmp(A,B):比较前，先将他们变成小写strncmp(A,B,len)或者strncasecmp(A,B,len)strnatcmp(A,B)或者strnatcasecmp(A,B)近似相等：soundex(A),metaphone(A),similar_text(A,B,@$#%),levenshrein()(2)字符串查找和处理substr(string,start,length)substr_count(big_string,small_string):字串出现次数substr_replace(orig 阅读全文
