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:
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:
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.
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