php怎么把这段数据转换为数组

php怎么把这段数据转换为数组
["测试1","1","1,9","2021-09-07 18:31:14"]["测试1","5","1,9","2021-09-07 18:31:26"]["","0","","2021-09-07 18:47:53"]["测试1","1","1,9","2021-09-08 09:34:30"]["测试1","1","1,9","2021-09-08 09:45:56"]["测试1","1","1,9","2021-09-08 09:47:14"]

你这个本身就是数组的格式。

$a1 = [
    ["测试1","1","1,9","2021-09-07 18:31:14"],
    ["测试1","5","1,9","2021-09-07 18:31:26"],
    ["","0","","2021-09-07 18:47:53"],
    ["测试1","1","1,9","2021-09-08 09:34:30"],
    ["测试1","1","1,9","2021-09-08 09:45:56"],
    ["测试1","1","1,9","2021-09-08 09:47:14"]     
];


print_r($a1);



$a2 = ["测试1","1","1,9","2021-09-07 18:31:14"];
$a3 = ["测试1","5","1,9","2021-09-07 18:31:26"];
$a4 = ["","0","","2021-09-07 18:47:53"];
$a5 = ["测试1","1","1,9","2021-09-08 09:34:30"];
$a6 = ["测试1","1","1,9","2021-09-08 09:45:56"];
$a7 = ["测试1","1","1,9","2021-09-08 09:47:14"];    


print_r($a2);
print_r($a3);
print_r($a4);
print_r($a5);
print_r($a6);
print_r($a7);