How to remove specified elements from a one-dimensional array in php

In PHP, array is a very common data type. When we need to operate on certain elements of an array, sometimes we need to remove elements. This article will explain how to use PHP to remove elements from a one-dimensional array.

First of all, we need to understand some functions in PHP. PHP provides the unset() function, which can be used to delete an element in an array, for example:

$arr = array(1,2,3,4,5); // 初始化一个数组
unset($arr[2]); // 删除数组中下标为 2 的元素
print_r($arr); // 输出 [1,2,4,5]

The output result of the above code is [1,2,4, 5], you can see that element 3 has been successfully deleted.

We can also use the array_splice() function to delete an element in the array, as shown below:

$arr = array(1,2,3,4,5); // 初始化一个数组
array_splice($arr, 2, 1); // 删除从下标为 2 开始，长度为 1 的元素
print_r($arr); // 输出 [1,2,4,5]

This code can also successfully delete element 3 , the final output result is the same.

Next, we need to implement the operation of deleting multiple elements from a one-dimensional array. Consider using the unset() function to achieve this, for example:

$arr = array(1,2,3,4,5); // 初始化一个数组
$index = array(1,3); // 需要删除的元素下标
foreach ($index as $value) {
    unset($arr[$value]); // 删除数组中对应的元素
}
print_r($arr); // 输出 [1,3,5]

In this code, we first define an array composed of the indexes of elements that need to be deleted$index, and then use the foreach() loop to delete each element in the original array, and the final output result is [1,3,5].

Of course, we can also use the array_splice() function to delete multiple elements, as shown below:

$arr = array(1,2,3,4,5); // 初始化一个数组
$index = array(1,3); // 需要删除的元素下标
foreach ($index as $value) {
    array_splice($arr, $value, 1); // 删除数组中对应的元素
}
print_r($arr); // 输出 [1,3,5]

This code is the same as the above The implementation of the unset() function is similar, except that it uses another way to delete elements.

Finally, let’s take a look at how to delete elements from an array by value. We can use the array_search() function to find the subscript corresponding to a value in the array, and then combine it with the unset() or array_splice() function to delete it corresponding element. For example:

$arr = array(1,2,3,4,5); // 初始化一个数组
$value = 3; // 需要删除的值
$key = array_search($value, $arr); // 查找值对应的下标
unset($arr[$key]); // 删除对应的元素
print_r($arr); // 输出 [1,2,4,5]

This code implements the operation of deleting the element with value 3 from the array.

To sum up, this article introduces the method of deleting elements from a one-dimensional array in PHP. I hope the content of this article will be helpful to you.

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