这很可能绊倒您的事情是，适用性阵列不仅仅是一个数组的数组，以便在一个例子，你想要得到的species_name财产第一第二顶层元素你会使用类似

  $阵列[1] [适用性] [0] [species_name];
 

值得注意的是你的第一个数组不包含一个适合的价值，这样将无法被访问。在fo​​reach循环中，你可以使用类似这样的结构：

 的foreach（$数组作为$值）{
     如果（使用isset（$值[适用性]）{
            回声$价值[适用性] [0] [species_name];
     }
}
 

After several hours of messing, sweating and pulling my hair out I'm still unable to access these values. I want to loop through the first level of arrays, and that's simple enough with a basic 'foreach' loop but I can't seem to get to the '['suitability']' array on the second sub array. I've looked around but can't seem to get anything other than really basic array tutorials which don't seem to delve to far into looping.

I'm trying to access the values in the nested/sub array ie '['Species_name']'.

I don't want to use associative keys as the sorting is a bit of an issue.

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
                        )
                )
       )
)

The thing that is probably tripping you up is that suitability is an array of arrays not just an array so in an example where you want to get the species_name property of the first second top level element you would use something like

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

It's worth noting that your first array does not contain a "suitability" value so that would not be able to be accessed. In a foreach loop you could use a construct similar to this:

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