How to use primitive functions to extract subarrays that meet the conditions in a two-dimensional array

ababaaid


ab:
    $array=[
        ["id"=>1,"name"=>"name1","value"=>"value1"],
        ["id"=>1,"name"=>"name2","value"=>"value2"],
        ["id"=>2,"name"=>"name3","value"=>"value3"],
        ["id"=>3,"name"=>"name4","value"=>"value4"],
        ["id"=>3,"name"=>"name5","value"=>"value5"],
        .......
    ];
idaid==1:
$end=[
        ["id"=>1,"name"=>"name1","value"=>"value1"],
        ["id"=>1,"name"=>"name2","value"=>"value2"],
];
Php
Mar.17,2021

the function prototypes of most groups of native functions are also looped to the array. Unless your array is extremely large and complex, foreach will not have any efficiency problems

the description of the subject is rather messy. I don't know if I understand it this way or not.
there are two arrays an and b. The array structure is as follows: 

$a = [['id' => '1', 'name' => 'name1'],['id' => '2', 'name' => 'name2']];
$b = [['id' => '1', 'value' => 'value1'],['id' => '2', 'value' => 'value2']];

then the goal is to add some of the data from array b to array a to get a data similar to this: 

$c = [['id' => '1','name' => 'name1' ,'value' => 'value1'],['id' => '2','name' => 'name2', 'value' => 'value2']];

in this case, if both arrays are large, for example, there are about 10000 sets of data, the direct double loop does have performance problems.
this problem can improve performance by setting one of the arrays to key-value based on id. The code is as follows: 

$storage_a = []; 
foreach($a as $value) {
    $storage_a[$value['id']] = $value;
}
foreach($b as $value) {
    if(isset($storage_a[$value['id']])) {
        $storage_a[$value['id']]['value'] = $value['value'];
    }   
}
print_r($storage_a);

whether the native functions of specific PHP achieve similar functions, the subject can check the PHP manual.
because the subject is one-to-many content, the code needs to be adjusted according to the actual situation.
from a performance point of view, the complexity of a direct double loop is O (nimm), so the complexity of writing can be roughly regarded as O (nimm).

if you don't want to loop nesting, use array_reduce ()

Previous: After adding the checked attribute to the input tag through JS, and then calling the removeAttribute () method, why can't you delete it?

Next: How does the Vue-router navigation guard implement an error callback?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e52214-43e43.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e52214-43e43.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?