Fill array with values without loop in PHP

use array_fill():

$t = array_fill(0, $n, 'val');

I think you can use

$array = array_pad(array(), $n, "val");

to get the desired effect.

See array_pad() on php.net

$a = array('key1'=>'some value', 'KEY_20'=>0,'anotherKey'=>0xC0DEBABE);

/* we need to nullify whole array with keep safe keys*/

$a = array_fill_keys(array_keys($a),NULL);

var_export($a);

/*result:

array(
     'key1'=>NULL, 
     'KEY_20'=>NULL,
     'anotherKey'=>NULL
);
*/

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