Using PHP array_unshift, array_push, and array_splice to Insert Elements

1. array_unshift() – inserting elements at the beginning of an array

<code>$fruits = array('apple','pear','banana','orange');
array_unshift($fruits, 'cherry');
pr($fruits);

function pr($str){
    echo "<pre>";
    print_r($str);
    echo "

"; }

Output:

<code>Array(
    [0] => cherry
    [1] => apple
    [2] => pear
    [3] => banana
    [4] => orange
)
</code>

array_unshift can also accept multiple elements:

<code>$fruits = array('apple','pear','banana','orange');
array_unshift($fruits, 'cherry', 'pie');
pr($fruits);
</code>

Output:

<code>Array(
    [0] => cherry
    [1] => pie
    [2] => apple
    [3] => pear
    [4] => banana
    [5] => orange
)
</code>

2. array_push() – inserting elements at the end of an array

<code>$arr = array();
array_push($arr, e1, e2, ... , en);
</code>

3. array_splice() – inserting elements at any position (keys are reindexed)

<code>$fruits = array('apple','pear','banana','orange');
// third parameter is 0 (no removal), second parameter is the index, last parameter is the element or an array of elements
array_splice($fruits, 3, 0, 'pie');
pr($fruits);
</code>

Output:

<code>Array(
    [0] => apple
    [1] => pear
    [2] => banana
    [3] => pie
    [4] => orange
)
</code>

Inserting multiple new elements can be done by passing an array:

<code>$fruits = array('apple','pear','banana','orange');
$new_items = array('pie','pie2');
array_splice($fruits, 3, 0, $new_items);
pr($fruits);
</code>

Output:

<code>Array(
    [0] => apple
    [1] => pear
    [2] => banana
    [3] => pie
    [4] => pie2
    [5] => orange
)
</code>

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