What is the difference between replacing a value and a key in an array in PHP?

When replacing a value in an array in PHP, you are updating the existing value at a specific index. When replacing a key in an array, you are updating the key itself, which may involve changing the position of the key in the array. To replace a value in an array, you can simply assign a new value to the specific index. To replace a key in an array, you can create a new key-value pair with the desired key and value, and then unset the old key. 

// Replace a value in an array
$array = [1, 2, 3];
$array[1] = 5; // Replaces the value at index 1 with 5

// Replace a key in an array
$array = ['a' => 1, 'b' => 2];
$array['c'] = $array['b']; // Create a new key 'c' with the value of 'b'
unset($array['b']); // Unset the old key 'b'

Keywords

array key value replacement PHP

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