过滤平面关联数组以仅保留相关键共享相同后缀的元素

Question

我有一个动态数组

[
    "question" => "test 1",
    "question1" => "hello test 1",
    "question2" => "hello test 2 checked",
    "homepage2" => "homepage",
    "question3" => "3 test checked",
    "homepage3" => "homepage",
    "question4" => "question 4 ? checked",
]

按键是“question”、“question1”...等 和“主页”，“主页1”..等 所以我只想在索引为 Question($number) 并且具有与 homepage($number) 类似的键时仅显示数组中的值

如何让它看起来像下面这样？

[
    "question2" => "hello test 2 checked",
    "homepage2" => "homepage",
    "question3" => "3 test checked",
    "homepage3" => "homepage",
]

Answer 1

您可以首先创建一个由后缀数字作为键的数组，并将键具有该后缀数字的所有键/值对的数组存储为值。然后，您将过滤那些具有两个这样的键/值对的内容，并以您需要的格式排列它们：

$arr = [
  "question"=> "test 1",
  "question1"=> "hello test 1",
  "question2"=> "hello test 2 checked",
  "homepage2"=> "homepage",
  "question3"=> "3 test checked",
  "homepage3"=> "homepage",
  "question4"=> "question 4 ? checked",
];

$temp = [];
foreach($arr as $key => $value) {
    if (preg_match("/^(question|homepage)(\d+)$/", $key, $parts))
        $temp[$parts[2]][$parts[0]] = $value;
}
$result = [];
foreach($temp as $num => $pair) {
    if (count($pair) == 2) $result = array_merge($result, $pair);
}

print_r($result);

$result

将是：

Array (
    "question2" => "hello test 2 checked",
    "homepage2" => "homepage",
    "question3" => "3 test checked",
    "homepage3" => "homepage"
)

查看它在 eval.in 上运行。

更多逻辑结构

但是，我建议采用更符合逻辑的结构，将问题和主页组合成一对（数组），并将其分配给一个键，即该对的编号。在这种情况下，两个循环需要进行微小的更改：

$temp = [];
foreach($arr as $key => $value) {
    if (preg_match("/^(question|homepage)(\d+)$/", $key, $parts))
        $temp[$parts[2]][$parts[1]] = $value;
}
$result = [];
foreach($temp as $num => $pair) {
    if (count($pair) == 2) $result[$num] = $pair;
}

这将给出以下结构：

Array(
    "2" => Array(
        "question" => "hello test 2 checked",
        "homepage" => "homepage"
    ),    
    "3" => Array(
        "question" => "3 test checked",
        "homepage" => "homepage"
    )
)

查看它在 eval.in 上运行。

Answer 2

仅使用一次迭代检查相关键来过滤数组行。

strtr()

用于在执行关键搜索之前交换伙伴词。 演示

$mates = [
    'question' => 'homepage',
    'homepage' => 'question',
];

var_export(
    array_filter(
        $array,
        fn($k) => key_exists(strtr($k, $mates), $array),
        ARRAY_FILTER_USE_KEY
    )
);

array (
  'question2' => 'hello test 2 checked',
  'homepage2' => 'homepage',
  'question3' => '3 test checked',
  'homepage3' => 'homepage',
)

Answer 3

这是对我有用的东西：

<?php
$homePageNum = 2;

$var =  array(
"question"=>
"test 1",
"question1"=>
"hello test 1",
"question2"=>
"hello test 2 checked",
"homepage2"=>
"homepage",
"question3"=>
"3 test checked",
"homepage3"=>
"homepage",
"question4"=>
"question 4 ? checked"
);

die($var['question'.$homePageNum]);

?>