Php – Create an assoc array with equal keys and values from a regular array

arraysphp

I have an array that looks like

$numbers = array('first', 'second', 'third');

I want to have a function that will take this array as input and return an array that would look like:

array(
'first' => 'first',
'second' => 'second',
'third' => 'third'
)

I wonder if it is possible to use array_walk_recursive or something similar…

Best Solution

You can use the array_combine function, like so:

$numbers = array('first', 'second', 'third');
$result = array_combine($numbers, $numbers);

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Java – Create ArrayList from array

new ArrayList<>(Arrays.asList(array));

Javascript – How to extend an existing JavaScript array with another array, without creating a new array

The .push method can take multiple arguments. You can use the spread operator to pass all the elements of the second array as arguments to .push:

>>> a.push(...b)

If your browser does not support ECMAScript 6, you can use .apply instead:

>>> a.push.apply(a, b)

Or perhaps, if you think it's clearer:

>>> Array.prototype.push.apply(a,b)

Please note that all these solutions will fail with a stack overflow error if array b is too long (trouble starts at about 100,000 elements, depending on the browser).
If you cannot guarantee that b is short enough, you should use a standard loop-based technique described in the other answer.

Best Solution

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