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PHP中怎么从二维数组中随机取出值??

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<?php
$data = array(
    array(
        "price" => "6874", "air" => "aa"
    ),
    array(
        "price" => "4726", "air" => "bb"
    ),
    array(
        "price" => "6569", "air" => "cc"
    ),
    array(
        "price" => "6569", "air" => "dd"
    ),
    array(
        "price" => "3380", "air" => "ee"
    ),
    array(
        "price" => "4200", "air" => "ff"
    ),
    array(
        "price" => "6874", "air" => "11"
    ),
    array(
        "price" => "4726", "air" => "22"
    ),
    array(
        "price" => "6569", "air" => "33"
    ),
    array(
        "price" => "6569", "air" => "44"
    ),
    array(
        "price" => "3380", "air" => "55"
    ),
    array(
        "price" => "4200", "air" => "66"
    ),

);
//随机选择出6个元素
$temp = array_rand($data, 6);
//重组数组
$data_last = array();
foreach ($temp as $val) {
    $data_last[] = $data[$val];
}
var_dump($data_last);
?>


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