Home >Backend Development >PHP Tutorial >Two-dimensional array selects only target fields

Two-dimensional array selects only target fields

WBOYOriginal: 2016-08-10 09:07:321032browse

I now have more than 1,000 pieces of data in the two-dimensional array, and the fields in each piece of data are redundant. Now I only need the 3 target fields in the red box in each piece of data, and the others are fine. No,
I now know that I need to use a double foreach loop to do it, but I haven’t been able to do it. Please help me with the answer, thank you
The picture is as follows:
Two-dimensional array selects only target fields

Reply content:

Questioner, do you want to extract the field you want from the two-digit array? You don’t need to do it twiceforeachah

<code class="php"><?php

//---构造测试数据 ---
$arry = [];
for ($i=0; $i < 1000; $i++) { 
    $arry[] = [
        'platform_good_id' => mt_rand(1, 2000),
        'good_name' => 'goodname' . $i,
        'xxxxxxx' => 'xxxxx',
        'wadadad' => 'adwawdadwad',
        'remake' => ''
    ];
}
//---构造测试数据 ---



$data = [];

foreach ($arry as $key => $value) {
    $data[] = [
        'platform_good_id' => $value['platform_good_id'],
        'good_name'        => $value['good_name'],
        'remake'           => $value['remake'],
    ];
}


var_dump($data);

</code>

As follows:

<code><!DOCTYPE html>
<html>
<body>

<?php


$arr = array(
    "a"=>array("a"=>"a","b"=>"b","c"=>"c","d"=>"d","e"=>"e"),
    "b"=>array("a"=>"a","b"=>"b","c"=>"c","d"=>"d","e"=>"e"),
    "c"=>array("a"=>"a","b"=>"b","c"=>"c","d"=>"d","e"=>"e"),
    "d"=>array("a"=>"a","b"=>"b","c"=>"c","d"=>"d","e"=>"e"),
    "e"=>array("a"=>"a","b"=>"b","c"=>"c","d"=>"d","e"=>"e"));

$result = array();

foreach ($arr as $k => $v){
    $result[$k] = array();
    foreach($v as $key => $value){
        if($key === "b" || $key === "d" || $key === "e"){
            $result[$k][$key] = $value;
        }
    }
}
print_r($arr);
print("<br/>");
print_r($result);
?>

</body>
</html></code>

The above code extracts the elements whose key value is b d e and then forms a new array.

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：Virtualbox installation iso errorNext article：Virtualbox installation iso error

See more

Two-dimensional array selects only target fields

Reply content:

Related articles