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

高洛峰
Release: 2023-03-03 21:28:01
Original
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PHP built-in function array_multisort requires that each array is of the same size
$areas is a two-dimensional array of areas, including the number of people and times. Now we need to sort these two numbers in descending order

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); }
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For example, there is a multi-array:

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

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 $multi_array; } //处理 echo “
”; print_r(multi_array_sort($arr,'age'));exit; //输出 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 大宇 0
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For more PHP multi-dimensional array sorting issues, please pay attention to the PHP Chinese website for related articles sorting according to an item in a two-dimensional array!

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