/**
* 取得数组
*
* @param string $sql
* @return bool/null/array
*/
public static function getAll($sql, $host = 'slave'){
self::connect($host);
$result = self::query($sql, $host);
if ($result === false) return array();
$array = array();
while ($tmp=mysqli_fetch_array($result,MYSQLI_ASSOC)){
$array[] = $tmp;
}
return !empty($array) ? $array : null;
}
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