PHP - 访问多维数组值

Question

经过几个小时的弄乱,出汗和拉扯我的头发后,我仍然无法获得这些价值观.我想循环遍历第一级数组,这很简单,基本的'foreach'循环,但我似乎无法到达第二个子数组上的'['suitability']'数组.我环顾四周,但除了真正基本的数组教程之外似乎无法得到任何东西,这些教程似乎没有深入研究循环.

我正在尝试访问嵌套/子数组中的值,即'['Species_name']'.

我不想使用关联键,因为排序有点问题.

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => Bradeley Hall Pool
            [postcode] => CW1 5QN
            [lat] => 53.10213
            [lon] => -2.41069
            [size] => 1.60
            [pegs] => 21
            [distance] => 26.6
        )

    [1] => Array
        (
            [id] => 2
            [name] => Farm Pool
            [postcode] => CW9 6JQ
            [lat] => 53.320502
            [lon] => -2.549049
            [size] => 0.88
            [pegs] => 8
            [distance] => 15.4
            [suitability] => Array
                (
                    [0] => Array
                        (
                            [fk_water_id] => 2
                            [fk_species_id] => 4
                            [species_name] => Barbel
                            [species_rating] => 1
                            [record_id] => 1
                            [weight_kg] => 2.721554
                            [length_cm] => 40
                            [height_cm] => 30
                        )
                )
       )
)

Answer 1

可能绊倒的事情是,适用性是一个数组的数组,而不仅仅是一个数组,所以在一个例子中,你想获得第一个第二个顶级元素的species_name属性,你会使用像

$array[1]["suitability"][0]["species_name"];

值得注意的是,您的第一个数组不包含"适用性"值,因此无法访问.在foreach循环中,您可以使用类似于此的构造:

foreach($array as $value){
    if (isset($value["suitability"])){
        echo $value["suitability"][0]["species_name"];
    }
}