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name Punditsdkoslkdosdkoskdo

PHP attach one exhibit to another (not array_push or +)

How to append one array to another without comparing their keys?

$a = array( 'a', 'b' );
$b = array( 'c', 'd' );

At the end it should be: Array( [0]=>a [1]=>b [2]=>c [3]=>d ) If I use something like [] or array_push, it will cause one of these results:

Array( [0]=>a [1]=>b [2]=>Array( [0]=>c [1]=>d ) )
//or
Array( [0]=>c [1]=>d )

It just should be something, doing this, but in a more elegant way:

foreach ( $b AS $var )
    $a[] = $var;

For big array, is better to concatenate without array_merge, for avoid a memory copy.

$array1 = array_fill(0,50000,'aa');
$array2 = array_fill(0,100,'bb');

// Test 1 (array_merge)
$start = microtime(true);
$r1 = array_merge($array1, $array2);
echo sprintf("Test 1: %.06f
", microtime(true) - $start);

// Test2 (avoid copy)
$start = microtime(true);
foreach ($array2 as $v) {
    $array1[] = $v;
}
echo sprintf("Test 2: %.06f
", microtime(true) - $start);


// Test 1: 0.004963
// Test 2: 0.000038
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Another way to do this in PHP 5.6+ would be to use the ... token

$a = array('a', 'b');
$b = array('c', 'd');

array_push($a, ...$b);

// $a is now equals to array('a','b','c','d');

This will also work with any Traversable

$a = array('a', 'b');
$b = new ArrayIterator(array('c', 'd'));

array_push($a, ...$b);

// $a is now equals to array('a','b','c','d');

warning though:

  • in PHP versions before 7.3 this will cause a fatal error if $b is an empty array or not traversable e.g. not an array
  • in PHP 7.3 a warning will be raised if $b is not traversable
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array_merge is the elegant way:

$a = array('a', 'b');
$b = array('c', 'd');
$merge = array_merge($a, $b); 
// $merge is now equals to array('a','b','c','d');

Doing something like:

$merge = $a + $b;
// $merge now equals array('a','b')
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