array_multisort

<?php

$myArray = array(1, 19, 18, 12, 56);

function compare($a, $b) {
    echo "Comparing $a to $b\n";
    if ($a == $b) return 0;
    return ($a < $b) ? -1 : 1;
}

usort($myArray,"compare");
print_r($myArray);
?>


<?php 
function cmp ($a, $b) 
{   
global $w_o; 
if ($a[$w_o] == $b[$w_o]) return 0; 
return ($a[$w_o] < $b[$w_o]) ? -1 : 1; 
} 
# the index is the second element of 
# each row 

$w_o =1; 
usort($my_arry_info,"cmp"); 
?>

this is a new multisort function for sorting on multiple subfield like it will be in sql : 'ORDER BY field1, field2' 
number of sort field is undefined 
<?php 

$array[] = array('soc' => 3, 'code'=>1); 
$array[] = array('soc' => 2, 'code'=>1); 
$array[] = array('soc' => 1, 'code'=>1); 
$array[] = array('soc' => 1, 'code'=>1); 
$array[] = array('soc' => 2, 'code'=>5); 
$array[] = array('soc' => 1, 'code'=>2); 
$array[] = array('soc' => 3, 'code'=>2); 

//usage 
print_r(multiSort($array, 'soc', 'code')); 

function multiSort() { 
    //get args of the function 
    $args = func_get_args(); 
    $c = count($args); 
    if ($c < 2) { 
        return false; 
    } 
    //get the array to sort 
    $array = array_splice($args, 0, 1); 
    $array = $array[0]; 
    //sort with an anoymous function using args 
    usort($array, function($a, $b) use($args) { 

        $i = 0; 
        $c = count($args); 
        $cmp = 0; 
        while($cmp == 0 && $i < $c) 
        { 
            $cmp = strcmp($a[ $args[ $i ] ], $b[ $args[ $i ] ]); 
            $i++; 
        } 

        return $cmp; 

    }); 

    return $array; 

} 
?> 

output: 
Array 
( 
    [0] => Array 
        ( 
            [soc] => 1 
            [code] => 1 
        ) 

    [1] => Array 
        ( 
            [soc] => 1 
            [code] => 1 
        ) 

    [2] => Array 
        ( 
            [soc] => 1 
            [code] => 2 
        ) 

    [3] => Array 
        ( 
            [soc] => 2 
            [code] => 1 
        ) 

    [4] => Array 
        ( 
            [soc] => 2 
            [code] => 5 
        ) 

    [5] => Array 
        ( 
            [soc] => 3 
            [code] => 1 
        ) 

    [6] => Array 
        ( 
            [soc] => 3 
            [code] => 2 
        ) 

)


<?php
$listSort[] = array('email' => '[email protected]', 'name' => 'x', 'umur' => 21);
$listSort[] = array('email' => '[email protected]', 'name' => 'y', 'umur' => 11);
$listSort[] = array('email' => '[email protected]', 'name' => 'z', 'umur' => 33);
foreach ($listSort as $key => $row) {
    $name2[$key] = $row['name'];
    $umur2[$key] = $row['umur'];
}
array_multisort($umur2, SORT_DESC, $name2, SORT_ASC, $listSort);
echo '<pre>';
echo print_r($listSort);
echo '</pre>';