Question

I have an array that needs sorted by ‘yes’ and ‘no’ keys – how might this be done in PHP? Specifically I would like all yes’s to be first index (there will only ever be 1 yes and many no’s)

Array (
[0] => Array
    (
        [no] => Array
            (
                [0] => 379
            )

        [yes] => Array
            (
                [1] => 370
            )

    )

[1] => Array
    (
        [yes] => Array
            (
                [0] => 372
            )

    )

[2] => Array
    (
        [no] => Array
            (
                [0] => 377
            )

        [yes] => Array
            (
                [1] => 374
            )

    )

)

Answer 1

You can use uksort to sort an array according to its keys using a custom comparison function:

<?php
 function yesfirst($a, $b) {
  if ($a === 'yes') {
    return -1;
  } elseif ($b === 'yes') {
    return 1;
  } else {
    return 0;
  }
}

function uksort_yesfirst($ary) {
    uksort($ary, 'yesfirst');
    return $ary;
}

$array = array(
  0 => array( no => array(0 => 379), yes => array(1 => 370)),

  1 => array( yes => array( 0 => 372) ),

  2 => array( no => array( 0 => 377), yes => array( 1 => 374))
);

$array = array_map('uksort_yesfirst', $array);
print_r($array);
?>