PHP生成随机密码函数

function randStr($len=6,$format='ALL'){<br />	switch($format){<br />		case 'ALL':<br />			$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-@#~';<br />		break;<br />		case 'CHAR':<br />			$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-@#~';<br />		break;<br />		case 'NUMBER':<br />			$chars='0123456789';<br />		break;<br />		default :<br />			$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-@#~'; <br />		break;<br />	}<br />	mt_srand((double)microtime()*1000000*getmypid()); <br />	$password='';<br />	while(strlen($password)<$len){<br />		$password.=substr($chars,(mt_rand()%strlen($chars)),1);<br />	}<br />	return $password;<br /><p>}

srand((double)microtime()*1000000); <br />//随机产生0-99之间的整数<br />$randval=rand(0,99999999);<br />echo $randval,'<br />';

function randomkeys($length){<br />	$output='';<br />	for($a=0;$a<$length; $a++){<br />		$output.=chr(mt_rand(33, 126));    <br />	}<br />	return $output;<br />}<br />echo randomkeys(20);