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//生成随机字符串 function buildRandomString($type=1,$length=4){ if($type==1){ $chars=join('',range(0,9)); }elseif($type==2){ $chars=join('',array_merge(range('a','z'),array_merge('A','Z'))); }elseif($type==3){ $chars=join('',array_merge(range('a','z'),range('A','Z'),range(0,9))); } if($length>strlen($chars)){ exit('字符串长度不够'); } $chars=str_shuffle($chars); return substr($chars,0,$length); } //生成唯一字符串 function getUniName(){ return md5(uniqid(microtime(true),true)); } //得到文件扩展名 function getExt($filename){ return strtolower(end(explode(".",$filename))); }