PHP Exercises: Create a new array with n elements removed from the left

Last update on December 20 2024 10:24:20 (UTC/GMT +8 hours)

Write a PHP program to create a new array with n elements removed from the left.

Sample Solution:

PHP Code:

<?php
// Function definition for 'drop_from_left' that takes an array of items and an optional parameter '$n' (default value is 1)
function drop_from_left($items, $n = 1)
{
    // Use 'array_slice' to remove the first '$n' elements from the array
    return array_slice($items, $n);
}

// Call 'drop_from_left' with an array and display the result using 'print_r'
print_r(drop_from_left([1, 2, 3]));

// Call 'drop_from_left' with an array and a specified number of elements to drop, then display the result using 'print_r'
print_r(drop_from_left([1, 2, 3, 4], 2));

?>

Explanation:

• Define drop_from_left Function:
• The function drop_from_left takes an array $items and an optional parameter $n, which defaults to 1.
• This function removes the first $n elements from the array.

• array_slice($items, $n) returns a subset of $items, starting after the first $n elements.
• If $n is not specified, the function removes only the first element (since $n defaults to 1).

• The first call, drop_from_left([1, 2, 3]), drops the first element, outputting [2, 3].
• The second call, drop_from_left([1, 2, 3, 4], 2), drops the first two elements, outputting [3, 4].

Output:

Array
(
    [0] => 2
    [1] => 3
)
Array
(
    [0] => 3
    [1] => 4
)

Flowchart:

PHP Code Editor:

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