PHP foreach with Nested Array: A Comprehensive Guide

In PHP, navigating through nested arrays can be a common challenge. This discussion focuses on a specific scenario where you aim to display a subset of a nested array, specifically the values within the second nested array.

Using foreach with Nested Arrays

To handle nested arrays with foreach, you can employ the following approach:

Example:

$tmpArray = [
    [
        "one",
        [1, 2, 3]
    ],
    [
        "two",
        [4, 5, 6]
    ],
    [
        "three",
        [7, 8, 9]
    ]
];

foreach ($tmpArray as $innerArray) {
    if (is_array($innerArray)) {
        foreach ($innerArray as $value) {
            echo $value;
        }
    } else {
        echo $innerArray;
    }
}

Recursive Solution for Unknown Depth

If you are unsure of the depth of nesting in your array, you can employ a recursive solution:

function displayArrayRecursively($arr, $indent = '') {
    if ($arr) {
        foreach ($arr as $value) {
            if (is_array($value)) {
                displayArrayRecursively($value, $indent . '--');
            } else {
                echo "$indent $value \n";
            }
        }
    }
}

Specific Case: Displaying Third Level Only

In your specific case, you only want to display the values of the third level nested array:

foreach ($tmpArray as $inner) {
    if (is_array($inner)) {
        foreach ($inner[1] as $value) {
            echo "$value \n";
        }
    }
}