php脚本更方便得导出json

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function backjson($cons,$arrs,$sql){
	if ($arrs&&$sql) {
		$list = array();
		mysql_select_db($cons['db'],$cons['co']);		
		mysql_query('SET NAMES UTF8');
		$res = mysql_query($sql);
		while ($row = mysql_fetch_array($res)) {
			$aro = array();
			foreach ($arrs as $key => $value) {
				$aro[$key] = $row[$value];
			}
			array_push($list, $aro);
		}
		return json_encode($list,JSON_UNESCAPED_UNICODE);
	}
}