PHP: 将关联数组元素移动到 array 的开头

You can use the array union operator (+) to join the original array to a new associative array using the known key (one).

$myArray = array('one' => $myArray['one']) + $myArray;
// or      ['one' => $myArray['one']] + $myArray;

Array keys are unique, so it would be impossible for it to exist in two locations.

See further at the doc on Array Operators:

The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored.

There's a function in the comments of the PHP manual for array_unshift which can be used to add an element, with key, to the beginning of an array:

function array_unshift_assoc(&$arr, $key, $val)
{
$arr = array_reverse($arr, true);
$arr[$key] = $val;
return array_reverse($arr, true);
}

Unset the element and reinsert it again with the above function:

$tmp = $myArray['one'];
unset($myArray['one']);
$myArray = array_unshift_assoc($myArray, 'one', $tmp);

A more general approach may be to use uksort to sort your array by keys and provide a sorting function of your own.

If you have numerical array keys and want to reindex array keys, it would be better to put it into array_merge like this:

$myArray = array_merge(array($key => $value) + $myArray );

A bit late, but in case anyone needs it, I created this little snippet.

function arr_push_pos($key, $value, $pos, $arr)
{
$new_arr = array();
$i = 1;


foreach ($arr as $arr_key => $arr_value)
{
if($i == $pos)
$new_arr[$key] = $value;


$new_arr[$arr_key] = $arr_value;


++$i;
}


return $new_arr;
}

Just adjust it to suit your needs, or use it and unset the index to move. Works with associative arrays too.

Here's another simple one-liner that gets this done using array_splice():

$myArray = array_splice($myArray,array_search('one',array_keys($myArray)),1) + $myArray;

if you have 2 arrays, 1st has elements to move to the top of 2nd array of elements, you can use

$result = \array_replace($ArrayToMoveToTop, $myArray);

Here is a code sample:

//source array
$myArray = [
'two' => 'Blah Blah Blah 2',
'three' => 'Blah Blah Blah 3',
'one' => 'Blah Blah Blah 1',
'four' => 'Blah Blah Blah 4',
'five' => 'Blah Blah Blah 5',
];
// set necessary order
$orderArray = [
'one' => '',
'two' => '',
];
//apply it
$result = \array_replace($orderArray, $myArray);
\print_r($result);