随时随地进行数组合并

Question

我经常开始定义一个 array，然后发现我需要将它分成两部分或更多部分。然后我将从 $array('key' => 'value') 开始作为我的第一个值，然后不得不像这样为数组的其他部分重写代码：$array['key'] = 'value'。但这很麻烦。

所以我尝试了以下方法，似乎有效：

$my_true_love_sent_me_for_christmas = array(
    'First day'     =>  'A Partridge in a Pear Tree',
    'Second day'    =>  '2 Turtle Doves',
    'Third day'     =>  '3 French Hens',
    'Fourth day'    =>  '4 Calling Birds',
);

breathe(); // breathe, and then I want to continue my array where I left it.

$my_true_love_sent_me_for_christmas = array_merge($my_true_love_sent_me_for_christmas, array(
    'Fifth day'     =>  '5 Golden Rings',
    'Sixth day'     =>  '6 Geese a Laying',
    'Seventh day'   =>  '7 Swans a Swimming',
    'Eighth day'    =>  '8 Maids a Milking',
));

breathe(); // breathe, and then I want to continue my array where I left it.

$my_true_love_sent_me_for_christmas = array_merge($my_true_love_sent_me_for_christmas, array(
    'Ninth day'     =>  '9 Ladies Dancing',
    'Tenth day'     =>  '10 Lords a Leaping',
    'Eleventh day'  =>  '11 Pipers Piping',
    'Twelfth day'   =>  '12 Drummers Drumming',
));

是否有一种 better/cleaner/faster 方法可以随时随地合并数组？

Answer 1

我认为您不需要这样复杂化。这也行。不过绝对是一个较短的版本：

<?php
$my_true_love_sent_me_for_christmas = array(
    'First day'     =>  'A Partridge in a Pear Tree',
    'Second day'    =>  '2 Turtle Doves',
    'Third day'     =>  '3 French Hens',
    'Fourth day'    =>  '4 Calling Birds',
);

breathe(); // breathe, and then I want to continue my array where I left it.

$my_true_love_sent_me_for_christmas['Fifth day']     =  '5 Golden Rings';
$my_true_love_sent_me_for_christmas['Sixth day']     =  '6 Geese a Laying';
$my_true_love_sent_me_for_christmas['Seventh day']   =  '7 Swans a Swimming';
$my_true_love_sent_me_for_christmas['Eighth day']    =  '8 Maids a Milking';

breathe(); // breathe, and then I want to continue my array where I left it.

$my_true_love_sent_me_for_christmas['Ninth day']     =  '9 Ladies Dancing';
$my_true_love_sent_me_for_christmas['Tenth day']     =  '10 Lords a Leaping';
$my_true_love_sent_me_for_christmas['Eleventh day']  =  '11 Pipers Piping';
$my_true_love_sent_me_for_christmas['Twelfth day']   =  '12 Drummers Drumming';

比上面更好的版本是在某处定义所有数组，然后一次使用一个array_merge。

$my_true_love_sent_me_for_christmas = $chrismas1;

breathe(); // breathe, and then I want to continue my array where I left it.

$my_true_love_sent_me_for_christmas = array_merge($my_true_love_sent_me_for_christmas, $chrismas2);

breathe(); // breathe, and then I want to continue my array where I left it.

$my_true_love_sent_me_for_christmas = array_merge($my_true_love_sent_me_for_christmas, $chrismas3);

Answer 2

老实说，这已经很干净了，但是如果你想让代码更干净，看看是什么反复引起了困难。像这样定义一个辅助函数：

function addRange(&$mainArray, $range) {
    foreach ($range as $k => $v) {
        $mainArray[$k] = $v;
    }
}

然后你可以稍微简化你的代码：

$my_true_love_sent_me_for_christmas = array(
    'First day'     =>  'A Partridge in a Pear Tree',
    'Second day'    =>  '2 Turtle Doves',
    'Third day'     =>  '3 French Hens',
    'Fourth day'    =>  '4 Calling Birds',
);

breathe(); // breathe, and then I want to continue my array where I left it.

addRange($my_true_love_sent_me_for_christmas, array(
    'Fifth day'     =>  '5 Golden Rings',
    'Sixth day'     =>  '6 Geese a Laying',
    'Seventh day'   =>  '7 Swans a Swimming',
    'Eighth day'    =>  '8 Maids a Milking',
));

breathe(); // breathe, and then I want to continue my array where I left it.

addRange($my_true_love_sent_me_for_christmas, array(
    'Ninth day'     =>  '9 Ladies Dancing',
    'Tenth day'     =>  '10 Lords a Leaping',
    'Eleventh day'  =>  '11 Pipers Piping',
    'Twelfth day'   =>  '12 Drummers Drumming',
));

Answer 3

最简单的方法似乎是：

$foo = [
    'First day'  => 'A Partridge in a Pear Tree',
    'Second day' => '2 Turtle Doves',
    'Third day'  => '3 French Hens',
    'Fourth day' => '4 Calling Birds',
];

$foo += [
    'Fifth day'   => '5 Golden Rings',
    'Sixth day'   => '6 Geese a Laying',
    'Seventh day' => '7 Swans a Swimming',
    'Eighth day'  => '8 Maids a Milking',
];

$foo += [
    'Ninth day'    => '9 Ladies Dancing',
    'Tenth day'    => '10 Lords a Leaping',
    'Eleventh day' => '11 Pipers Piping',
    'Twelfth day'  => '12 Drummers Drumming',
];

print_r($foo);

参考：https://php.net/manual/language.operators.array.php

The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored.

随时随地进行数组合并

Array merge on the go

php

arrays

array-merge