$arrayOne = array('cat', 'dog', 'turkey');
$arrayTwo = array('peach', 'apple', 'banana');
foreach ($arrayTwo as $aRow) {
    $arrayOne[] = $aRow;
}

And we get this as a result:

Simple, but why do that when you can do this in one line using array_merge:

$newarray = array_merge($arrayOne, $arrayTwo);

and get this:

Array merge works with two or more arrays. Let's do it:

$arrayOne = array('cat', 'dog', 'turkey');
$arrayTwo = array('peach', 'apple', 'banana');
$arrayThree = array('dodge', 'ford', 'mazda');
$threeArrays = array_merge($arrayOne, $arrayTwo, $arrayThree);
new chk ($threeArrays);

And we get this:

As you can see newchk is easy to use, and you get great results. Let's get back to array_merge.

NULL ARRAYS

What if one of the arrays was a null?

$arrayOne = array('cat', 'dog', 'turkey');
$arrayTwo = array();
$arrayThree = array('dodge', 'ford', 'mazda');
$arrayNull = array_merge($arrayOne, $arrayTwo, $arrayThree);

Which results in:

So null arrays are just ignored.

ASSOCIATIVE KEYS

Now let's look at associative arrays.

$arrayOne = array( 'animal1' =>'cat', 'animal2' =>'dog', 'animal3' =>'turkey');
$arrayTwo = array('fruit1' => 'peach', 'fruit2' => 'apple', 'fruit3' => 'banana');
$newarray = array_merge($arrayOne, $arrayTwo);

What we expect:

But what if we had the same key in each of arrays?

$arrayOne = array( 'animal1' =>'cat', 'sameKey' =>'dog', 'animal3' =>'turkey');
$arrayTwo = array('fruit1' => 'peach', 'sameKey' => 'apple', 'fruit3' => 'banana');
$arrayThree = array( 'car1' => 'dodge', 'sameKey' => 'ford', 'car3' => 'mazda');
$newArr = array_merge($arrayOne, $arrayTwo, $arrayThree);

What I've done is put the same associative key in each array, and here are the results;

NUMERIC KEYS

What if we used intergers for keys, would we get the same results?

$arrayOne = array( 0 =>'cat', 2 =>'dog', 4 =>'turkey');
$arrayTwo = array( 0 => 'peach', 2  => 'apple', 4 => 'banana');
$newArr = array_merge($arrayOne, $arrayTwo);

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ARRAY UNION

$arrayOne = array( 0 =>'cat', 2 =>'dog', 4 =>'turkey');
$arrayTwo = array( 0 => 'peach', 2  => 'apple', 4 => 'banana');
$unionArr =  $arrayOne +  $arrayTwo;

And we get:

Notice that the keys that are the same are ignored in the second array.

STRINGS

$arrayOne = 'The quick fox blew it by not turning this into an array";
$arrayTwo = array( 0 => 'peach', 2  => 'apple', 4 => 'banana');
$stringArr =  array_merge( $arrayOne , $arrayTwo);
new chk( $arrayOne, $arrayTwo , $stringMerge );

$arrayOne =  (array) 'The quick fox blew it by not turning this into an array";
$arrayTwo = array( 0 => 'peach', 2  => 'apple', 4 => 'banana');
$stringMerge =  array_merge( $arrayOne , $arrayTwo);
new chk( $arrayOne, $arrayTwo , $stringMerge );

And we get:

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Now that we cast the string as an array, array_merge works as expected.

CLEANING ARRAYS

$arrayOne = array( 'animal1' =>'cat', 'animal2' =>'dog', 'animal3' =>'turkey');
$arrayTwo = array('fruit1' => '', 'sameKey' => '', 'fruit3' => 'banana');
$arrayThree = array( 'animal4' => 'cat', 'animal5' => 'lion', 'animal6' => 'turkey');

$uniqueArr = array_unique($mergeArr);
$filterArr = array_filter($uniqueArr);

And here are the last two arrays: