How to remove multiple elements from an array in php

In PHP, we can easily create and manipulate arrays. In some cases we need to remove multiple elements from an array. This article will explain how to remove multiple elements from an array in PHP.

1. Use the unset() function to remove array elements

Use the unset() function to delete a single element in the array. If you need to delete multiple elements, you can use a for loop to traverse the array and use The unset() function removes each element.

Sample code:

// 创建一个数组
$fruits = array("apple", "banana", "orange", "peach", "grape");

// 创建要删除的元素数组
$delete = array(0, 2, 4);

// 遍历 $delete 数组并使用 unset() 函数移除相应位置的元素
foreach ($delete as $i) {
    unset($fruits[$i]);
}

// 输出结果
print_r($fruits);

The above code will delete the elements at positions 0, 2 and 4 (i.e. "apple", "orange" and "grape") in the $fruits array and output the result For:

Array
(
    [1] => banana
    [3] => peach
)

2. Use the array_splice() function to remove array elements

The array_splice() function in PHP can remove array elements without destroying the original array keys. This function takes three parameters: the array being operated on, the starting position, and the number of elements to delete.

Sample code:

// 创建一个数组
$fruits = array("apple", "banana", "orange", "peach", "grape");

// 创建要删除的元素数组
$delete = array(0, 2, 4);

// 遍历 $delete 数组并使用 array_splice() 函数移除相应位置的元素
foreach ($delete as $i) {
    array_splice($fruits, $i, 1);
}

// 输出结果
print_r($fruits);

The above code will delete the elements at positions 0, 2 and 4 (i.e. "apple", "orange" and "grape") in the $fruits array and output the result For:

Array
(
    [1] => banana
    [3] => peach
)

3. Use the array_diff() function to remove array elements

array_diff() function returns a new array that deletes all values ​​that exist in other arrays from the first array. array. Therefore, we can use this function to delete the same elements in multiple arrays.

Sample code:

// 创建多个数组
$fruits1 = array("apple", "banana", "orange", "peach", "grape");
$fruits2 = array("apple", "pineapple", "orange");
$fruits3 = array("grape", "watermelon");

// 合并数组并使用 array_unique() 函数去重
$fruits = array_unique(array_merge($fruits1, $fruits2, $fruits3));

// 输出结果
print_r($fruits);

The above code will merge all elements from $fruits1, $fruits2 and $fruits3, and use the array_unique() function to remove duplicates. The output result is:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => peach
    [4] => grape
    [5] => pineapple
    [6] => watermelon
)

In this example, we did not delete certain elements explicitly, but deleted the same elements in multiple arrays by finding the difference set.

Summary

In PHP, multiple elements of an array can be removed using the unset() function, array_splice() function, and array_diff() function. Choosing which method to use depends on personal preference and specific application scenarios.

The above is the detailed content of How to remove multiple elements from an array in php. For more information, please follow other related articles on the PHP Chinese website!