Home > Article > Backend Development > php5.5 new array function array_column_PHP tutorial

php5.5 new array function array_column_PHP tutorial

WBOYOriginal: 2016-07-13 10:21:33706browse

php5.5 new array function array_column

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106

if(!function_exists('array_column')){
    function array_column($input, $columnKey, $indexKey=null){
        $columnKeyIsNumber      = (is_numeric($columnKey)) ? true : false;
        $indexKeyIsNull         = (is_null($indexKey)) ? true : false;
        $indexKeyIsNumber       = (is_numeric($indexKey)) ? true : false;
        $result                 = array();
        foreach((array)$input as $key=>$row){
            if($columnKeyIsNumber){
                $tmp            = array_slice($row, $columnKey, 1);
                $tmp            = (is_array($tmp) && !empty($tmp)) ? current($tmp) : null;
            }else{
                $tmp            = isset($row[$columnKey]) ? $row[$columnKey] : null;
            }
            if(!$indexKeyIsNull){
                if($indexKeyIsNumber){
                    $key        = array_slice($row, $indexKey, 1);
                    $key        = (is_array($key) && !empty($key)) ? current($key) : null;
                    $key        = is_null($key) ? 0 : $key;
                }else{
                    $key        = isset($row[$indexKey]) ? $row[$indexKey] : 0;
                }
            }
            $result[$key]       = $tmp;
        }
        return $result;
    }
}
// 使用例子
$records = array(
    array(
        'id' => 2135,
        'first_name' => 'John',
        'last_name' => 'Doe'
    ),
    array(
        'id' => 3245,
        'first_name' => 'Sally',
        'last_name' => 'Smith'
    ),
    array(
        'id' => 5342,
        'first_name' => 'Jane',
        'last_name' => 'Jones'
    ),
    array(
        'id' => 5623,
        'first_name' => 'Peter',
        'last_name' => 'Doe'
    )
);
$firstNames = array_column($records, 'first_name');
print_r($firstNames);
/*
Array
(
    [0] => John
    [1] => Sally
    [2] => Jane
    [3] => Peter
)
*/
$records = array(
    array(1, 'John', 'Doe'),
    array(2, 'Sally', 'Smith'),
    array(3, 'Jane', 'Jones')
);
$lastNames = array_column($records, 2);
print_r($lastNames);
/*
Array
(
    [0] => Doe
    [1] => Smith
    [2] => Jones
)
*/
$mismatchedColumns = array(
    array(
        'a' => 'foo',
        'b' => 'bar',
        'e' => 'baz'
    ),
    array(
        'a' => 'qux',
        'c' => 'quux',
        'd' => 'corge'
    ),
    array(
        'a' => 'grault',
        'b' => 'garply',
        'e' => 'waldo'
    ),
);
$foo = array_column($mismatchedColumns, 'a', 'b');
print_r($foo);
/*
Array
(
    [bar] => foo
    [0] => qux
    [garply] => grault
)
*/

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：PHP multiple file upload operation_PHP tutorialNext article：PHP multiple file upload operation_PHP tutorial

See more

php5.5 new array function array_column_PHP tutorial

php5.5 new array function array_column

Related articles