亖呉?盀
function random_password($length, $characters='abcdefgh1234567890'){
if ($characters == ''){ return ''; }
$chars_length = strlen($characters)-1;
mt_srand((double)microtime()*1000000);
$pwd = '';
while(strlen($pwd) < $length){
$rand_char = mt_rand(0, $chars_length);
$pwd .= $characters[$rand_char];
}
return $pwd;
}
//使用范例
random_password(5,'abcd1234') => returns something like: '2b4d3'
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