class-array-utils.php — Smush – Image Optimization, Compression, Lazy Load, WebP & CDN 4.1.0

wp-smushit / core / class-array-utils.php

wp-smushit / core Last commit date

class-array-utils.php

86 lines

1	<?php
2
3	namespace Smush\Core;
4
5	class Array_Utils {
6	public function array_hash( $array, $keys = array() ) {
7	$hash = 0;
8	if ( is_array( $array ) ) {
9	foreach ( $array as $key => $value ) {
10	if ( is_array( $value ) ) {
11	$value_hash = $this->array_hash(
12	$value,
13	array_merge( $keys, array( $key ) )
14	);
15	} else {
16	$prefix = join( '~', $keys );
17	$value_hash = crc32( $prefix . $value );
18	}
19
20	$hash += $value_hash;
21	}
22	}
23
24	return $hash;
25	}
26
27	public function get_array_value( $haystack, $key, $default_value = null ) {
28	if ( empty( $key ) ) {
29	return $default_value;
30	}
31
32	if ( ! is_array( $key ) ) {
33	$key = array( $key );
34	}
35
36	if ( ! is_array( $haystack ) ) {
37	return $default_value;
38	}
39
40	$value = $haystack;
41	foreach ( $key as $key_part ) {
42	$value = isset( $value[ $key_part ] ) ? $value[ $key_part ] : $default_value;
43	}
44
45	return $value;
46	}
47
48	public function put_array_value( &$haystack, $value, $keys ) {
49	if ( ! is_array( $keys ) ) {
50	$keys = array( $keys );
51	}
52
53	$pointer = &$haystack;
54	foreach ( $keys as $key ) {
55	if ( ! isset( $pointer[ $key ] ) ) {
56	$pointer = empty( $pointer ) ? array() : $pointer;
57	$pointer[ $key ] = array();
58	}
59	$pointer = &$pointer[ $key ];
60	}
61	$pointer = $value;
62	}
63
64	public function ensure_array( $array ) {
65	return empty( $array ) \|\| ! is_array( $array )
66	? array()
67	: $array;
68	}
69
70	/**
71	* WARNING: This trick works only for arrays in which all the values are valid keys.
72	* @see https://stackoverflow.com/a/8321701
73	*
74	* @param $array scalar[]
75	*
76	* @return array Unique array
77	*/
78	public function fast_array_unique( $array ) {
79	if ( ! is_array( $array ) ) {
80	return array();
81	}
82
83	return array_keys( array_flip( $array ) );
84	}
85	}
86