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function randpw($len=8,$format=’ALL’){
$is_abc = $is_numer = 0;
$password = $tmp =”;
switch($format){
case ‘ALL’:
$chars=’ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789′;
break;
case ‘CHAR’:
$chars=’ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz’;
break;
case ‘NUMBER’:
$chars=’0123456789′;
break;
default :
$chars=’ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789′;
break;
}
mt_srand((double)microtime()*1000000*getmypid());
while(strlen($password)
$tmp =substr($chars,(mt_rand()%strlen($chars)),1);
if(($is_numer <> 1 && is_numeric($tmp) && $tmp > 0 )|| $format == ‘CHAR’){
$is_numer = 1;
}
if(($is_abc <> 1 && preg_match(‘/[a-zA-Z]/’,$tmp)) || $format == ‘NUMBER’){
$is_abc = 1;
}
$password.= $tmp;
}
if($is_numer <> 1 || $is_abc <> 1 || empty($password) ){
$password = randpw($len,$format);
}
return $password;
}
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