How to delete a number in an array using PHP

In PHP, array is a very important data type, which contains multiple elements. Sometimes, we need to delete some unnecessary elements in the array to ensure the neatness and readability of the array. This article will introduce how to use PHP to delete a number in an array.

1. Use the unset function

PHP built-in functionunset()You can delete an element in the array. If you want to delete a number in the array, you can use the following code:

<?php
  $arr = array(5, 3, 7, 4, 9);
  unset($arr[2]);
  var_dump($arr);
?>

In the above code, an array containing 5 elements is declared, and then deleted using the unset() function The element whose subscript is 2. Finally, the array is output through the var_dump() function.

2. Use the array_splice function

array_splice()The function can delete an element in the array and return the deleted array.

<?php
  $arr = array(5, 3, 7, 4, 9);
  array_splice($arr,2,1);
  var_dump($arr);
?>

array_splice()The first parameter of the function is the array to be deleted, the second parameter is the starting subscript position of the element to be deleted, and the third parameter is is the number to be deleted.

3. Use the array_filter function

array_filter()The function can filter the elements in the array according to custom rules and return a new array. We can use this function to filter out the elements to be deleted and then re-form a new array to achieve the deletion effect.

<?php
  $arr = array(5, 3, 7, 4, 9);
  $arr = array_filter($arr, function($n) {
    return $n != 7;
  });
  var_dump($arr);
?>

In the above code, we use the array_filter() function to filter out the elements that are not equal to 7 in the array, thereby achieving the purpose of deleting the number 7.

Summary:

The above are several methods for deleting a number in an array. You can choose which method to use according to the actual situation. No matter which method is used, the original array will not be changed. If necessary, a new array can be redefined to ensure the neatness and readability of the array.

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