How to slice an array by key in PHP?

In this tutorial, you shall learn how to slice an array by key in PHP using array_slice() function, with example programs.

PHP – Slice an array by key

To slice an array by key in PHP, you can use array_slice() function.

By default, array_slice() function slices the array by given offset index and length. But to slice an array by key, we first find the index of the key in the array, and then pass the index of the key as argument to the array_slice() function.

Refer PHP – Slice array by index tutorial. We are building on this tutorial, to find the array slice by given keys.

To get the index of a given key, we use array_search() function.

Examples

1. Slice from specific staring key to end of the array

In the following program, we take an array $arr, and slice it from starting key of "dad" till the end of the array using array_slice() function.

PHP Program

<?php
$arr = array(
    'foo' => 10,
    'bar' => 20,
    'das' => 30,
    'qux' => 40,
    'par' => 50,
    'saz' => 60,
);

$start_key = 'das';

//get offset of start key in the array
$offset = array_search($start_key, array_keys($arr), true);

$sliced_array = array_slice($arr, $offset, null, true);
print_r($sliced_array);
?>

Output