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【PHP】随机字符串

作者:培政 / 发布于2015/7/22/ 481


	/**
	* 随机字符串
	* @param number $leng
	* @param string $type
	* @return string
	*/
	public static function RandomCode($leng=12,$type="all"){
	 $leng=$leng>0?intval($leng):12;
	 $str="";
	 if($type=='num'){
	 for($i=0;$i<$leng;$i++){
	 mt_srand(doubleval(microtime()*1000000));
	 $str.=chr(mt_rand(48,57));
	 }
	 }elseif($type=='capital'){
	 for($i=0;$i<$leng;$i++){
	 mt_srand(doubleval(microtime()*1000000));
	 $str.=chr(mt_rand(65,90));
	 }
	 }elseif($type=='lower'){
	 for($i=0;$i<$leng;$i++){
	 mt_srand(doubleval(microtime()*1000000));
	 $str.=chr(mt_rand(97,122));
	 }
	 }else{
	 $char=array("1","2","3","4","5","6","7","8","9","0","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z");
	 shuffle($char);
	 $n=count($char)-1;
	 $str="";
	 for($i=0;$i<$leng;$i++){
	 mt_srand(doubleval(microtime()*1000000));
	 $m=mt_rand(0,$n);
	 $str.=$char[$m];
	 }
	 }
	 return $str;
	}

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