Specific implementation of PHP two-dimensional array sorting according to a certain field_PHP tutorial

The function to be implemented recorded in this article is similar to ORDER BY in MySQL. Such a requirement was encountered in the previous project.

Requirement: Get 4 pieces of data from two different tables, then integrate (array_merge) into an array, and then sort the first 4 pieces in descending order according to the creation time of the data.

When encountering this requirement, ORDER BY cannot solve the problem. So I looked through the PHP manual and found the following method and made this note. < ;?php
/**
* Sort the two-dimensional array according to a certain field
* Function: Sort by the user’s age in reverse order

* @author ruxing.li */ header('Content-Type: text/html;Charset=utf-8'); $arrUsers = array( array(

'id' => 1,

'name' => '张三',
'age' => 25,
),
array(
'id ' => 2,
'name' => '李思',
'age' => 23,
),
array(
'id' => 3,
'name' => '王五',
'age' => 40,
),
array(
'id' => 4,
>'name' => 'Zhao Liu',
'age' => 31,
),
array(
'id' => 5,
'name' => '黄七',
'age' => 20,
),
);


$sort = array(
'direction' = > 'SORT_DESC', //Sort order flag SORT_DESC descending order; SORT_ASC ascending order
'field' => 'age', //Sort field
);
$arrSort = array();
foreach($arrUsers AS $uniqid => $row){
foreach($row AS $key=>$value){
$arrSort[$key][$uniqid] = $value;
}
}
if($sort['direction']){
array_multisort($arrSort[$sort['field']], constant($sort['direction']), $ arrUsers);
}

var_dump($arrUsers);

/*
Output result:

array (size=5)
0 = >
array (size=3)
'id' => int 5
'name' => string '黄七' (length=6)
'age' => int 20
1 =>
array (size=3)
'id' => int 2
'name' => string '李思' (length=6)
'age' => int 23
2 =>
array (size=3)
'id' => int 1
'name' => string '张三' (length=6)
'age' => int 25
3 =>
array (size=3)
'id' => int 4
'name' = > string '赵六' (length=6)
'age' => int 31
4 =>
array (size=3)
'id' => int 3
'name' => string '王五' (length=6)
'age' => int 40

*/





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The function to be implemented recorded in this article is similar to ORDER BY in MySQL. I encountered this in the previous project A demand. Requirement: Get 4 pieces of data from two different tables, and then...

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