$arr = array(
    '0'    =>    array(2,3),    //是’0' ,不是[‘0’]
    '1'    =>    array(22,33),
    '2'    =>    array(222,333),
    '3'    =>    array(2222,3333),
);
$arr = [
    '0'    =>    array(2,3),    //是’0' ,不是[‘0’]
    '1'    =>    array(22,33),
    '2'    =>    array(222,333),
    '3'    =>    array(2222,3333),
];
 

 

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