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 "
"; 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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