How Can I Access Keys When Looping Through a PHP Associative Array?

Looping Through an Associative Array: Exposing the Keys

In PHP, associative arrays are containers that map keys to values. While iterating through these arrays, you may encounter situations where you need to access the keys, rather than just the values.

Current Implementation:

Consider the following code snippet, which loops through an associative array and prints its values:

$arr = [
    1 => "Value1",
    2 => "Value2",
    10 => "Value10"
];

foreach ($arr as $v) {
    echo $v; // Value1, Value2, Value10
}

Query:

To access the keys in this array, we need to modify the loop to include the key itself:

foreach (.....) {
    echo $k; // 1, 2, 10
}

Solution:

PHP provides a convenient way to loop through both the keys and values of an associative array. By adding the => operator to the foreach statement, we can specify the variable that will hold the key and the variable that will hold the value:

foreach ($arr as $key => $value) {
    echo $key;
}

This modification will provide you with the keys of the associative array, allowing you to print them as needed:

1
2
10

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