How to add elements to php array

How to add elements to the php array: 1. Use the array_unshift() function to insert new elements to the head of the array; 2. Use the array_push() function to insert one or more new elements to the end of the array; 3. Use the array_splice() function to insert a new element at any position in the array.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

Add to the php array Element

1, array_unshift() inserts a new element into the array header

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

function pr($str){
    echo "<pre class="brush:php;toolbar:false">";
    print_r($str);
    echo "

"; }

Output:

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

can be passed to array_unshift Multiple elements

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

Output:

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

2. The similar function array_push inserts one or more elements to the end of the array.

$arr = array();
array_push($arr, e1, e2 ... en);

3. array_splice() inserts a new element at any position (regardless of key name)

$fruits = array('apple','pear','banana','orange');
//第三个参数固定为0，第二个参数为插入的索引位置,最后一个参数是插入的元素，如果插入多个，写成数组
array_splice($fruits,3,0,'pie');
pr($fruits);

Output:

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

// Insert multiple new elements and write them in array form

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

Output:

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

Recommended learning: "PHP Video Tutorial"

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