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[2] => Array ( [0] => 20 [1] => 21 [2] => 22 [3] => 23 )
)
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array(1,2,3),
array(11,12,13),
array(21,22,23)
);
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<script>
b = $s; //Ö±½ÓдÈë
ar = eval('$s'); //ͨ¹ý×Ö·û´®´«µÝ
alert(b[2][1]);
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