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<?php
declare( strict_types=1 );
namespace Automattic\WooCommerce\Internal\Utilities;
/**
* A class of utilities for dealing with arrays.
*/
class ArrayUtil {
/**
* Determines if the given array is a list.
*
* An array is considered a list if its keys consist of consecutive numbers from 0 to count($array)-1.
*
* Polyfill for array_is_list() in PHP 8.1.
*
* @param array $arr The array being evaluated.
*
* @return bool True if array is a list, false otherwise.
*/
public static function array_is_list( array $arr ): bool {
if ( function_exists( 'array_is_list' ) ) {
return array_is_list( $arr );
}
if ( ( array() === $arr ) || ( array_values( $arr ) === $arr ) ) {
return true;
}
$next_key = -1;
foreach ( $arr as $k => $v ) {
if ( ++$next_key !== $k ) {
return false;
}
}
return true;
}
/**
* Merge two lists of associative arrays by a key.
*
* @param array $arr1 The first array.
* @param array $arr2 The second array.
* @param string $key The key to merge by.
*
* @return array The merged list sorted by the key values.
*/
public static function merge_by_key( array $arr1, array $arr2, string $key ): array {
$merged = array();
// Overwrite items in $arr1 with items in $arr2 if they have the same key entry value.
// The rest of items in $arr1 will be appended.
foreach ( $arr1 as $item1 ) {
$found = false;
foreach ( $arr2 as $item2 ) {
if ( $item1[ $key ] === $item2[ $key ] ) {
$merged[] = array_merge( $item1, $item2 );
$found = true;
break;
}
}
if ( ! $found ) {
$merged[] = $item1;
}
}
// Append items from $arr2 that are don't have a corresponding key entry value in $arr1.
foreach ( $arr2 as $item2 ) {
$found = false;
foreach ( $arr1 as $item1 ) {
if ( $item1[ $key ] === $item2[ $key ] ) {
$found = true;
break;
}
}
if ( ! $found ) {
$merged[] = $item2;
}
}
// Sort the merged list by the key values.
usort(
$merged,
function ( $a, $b ) use ( $key ) {
return $a[ $key ] <=> $b[ $key ];
}
);
return array_values( $merged );
}
}