Array PHP multidimensional array sorting problem Sorting according to an item in a two-dimensional array

The PHP built-in function array_multisort requires that each array has the same size. $areas is a two-dimensional array of areas, including the number of people and times. Now we need to sort the two numbers in descending order. Copy the code. The code is as follows:

foreach ($areaArray as &$areas) { $times = $numbers = array(); foreach($areas as $province => $v) { $times[$province] = $v['times'] ; $numbers[$province] = $v['numbers'];

}

array_multisort($times, SORT_DESC, $numbers, SORT_DESC, $areas);
}


For example, there is a multi-array:



Copy code

The code is as follows:

$arr = array( 'd' => array('id' => 5, 'name' => 1, 'age' => 7) , 'b' => array('id' => 2,'name' => 3,'age' => 4), 'a' => array('id' => 8,'name' => 10,'age' => 5), 'c' => array('id' => 1,'name' => 2,'age' => 2)

);

Needs to sort the age items in the two-dimensional array.
You need to use PHP’s built-in function array_multisort(), you can read the manual.
Custom function:

Copy code

The code is as follows:

function multi_array_sort($multi_array,$sort_key,$sort=SORT_ASC){ if(is_array($multi_array)){ foreach ($multi_array as $row_array){ if(is_array($row_array)){ $key_array[] = $row_array[$sort_key];

}else{

return false;
}
}
}else{
return false;
}
array_multisort($key_array,$sort,$multi_array);
return $multi_array;
}
//process
echo “

”; 
print_r(multi_array_sort($arr,'age'));exit; 
//Output 
Array 
( 
[c] => Array 
( 
[id] => 1 
[name] => 2 
[age] => 2 
) 
[b] => ; Array 
( 
[id] => 2 
[name] => 3 
[age] => 4 
) 
[a] => Array 
( 
[id] => 8 
[ name] => 10 
[age] => 5 
) 
[d] => Array 
( 
[id] => 5 
[name] => 1 
[age] => 7 
) 
) 
written by Daewoo
0 


                
                
                

                    The above introduces the sorting problem of multi-dimensional arrays in PHP. Sorting according to an item in a two-dimensional array, including array content, I hope it will be helpful to friends who are interested in PHP tutorials.