How to delete specified key element from php array

When programming in PHP, we often encounter situations where we need to delete specific elements in an array. If you don't know how to delete a specific element from an array, you could be wasting a lot of time and making programming more difficult. In this article, I will show you how to delete specified elements from an array using PHP.

How to delete specified elements in an array in PHP

In PHP, we can use the unset() method to delete specified elements in an array. unset()The method can delete any element from the array, including the specified key value.

The following is a sample code that uses the unset() method to delete specified elements in an array:

$numbers = array(1, 2, 3, 4, 5, 6);
unset($numbers[3]); //删除键为3的元素
print_r($numbers);

In the above code, we first define an array $numbers, which contains 6 elements. Then, we used the unset() method to delete the element with key 3 in the array. Finally, we used the print_r() function to output the new array.

You can also use the array_splice() method to delete specified elements in the array. array_splice()The method can delete elements in the specified range and re-index the array. The following is a sample code that uses the array_splice() method to delete specified elements in an array:

$numbers = array(1, 2, 3, 4, 5, 6);
array_splice($numbers, 2, 1); //删除第3个元素
print_r($numbers);

In the above code, we first define an array $numbers, It contains 6 elements. Then, we used the array_splice() method to delete the third element in the array. Finally, we used the print_r() function to output the new array.

Delete multiple elements

If you need to delete multiple elements from the array, you need to call the key value of the element to be deleted multiple times in the unset() method . Here is a sample code that uses the unset() method to delete multiple elements in an array:

$numbers = array(1, 2, 3, 4, 5, 6);
unset($numbers[3]); //删除键为3的元素
unset($numbers[4]); //删除键为4的元素
print_r($numbers);

If you use the array_splice() method, you can delete it all at once Multiple elements. The following is a sample code that uses the array_splice() method to delete multiple elements in an array:

$numbers = array(1, 2, 3, 4, 5, 6);
array_splice($numbers, 2, 2); //删除第3个和第4个元素
print_r($numbers);

In the above code, we use the array_splice() method to delete The 3rd and 4th elements.

Delete the element with the specified value

If you need to delete the element with the specified value from the array, you need to use the array_search() function to find the key value of the element to be deleted . The element can then be removed using the unset() or array_splice() method. The following is an example code that uses the array_search() function to delete elements with a specified value in an array:

$numbers = array(1, 2, 3, 4, 5, 6);
$key = array_search(3, $numbers); //查找值为3的元素的键值
unset($numbers[$key]); //删除查找到的元素
print_r($numbers);

In the above code, we use the array_search() function The key value of the element with a value of 3 was found, and then the unset() method was used to delete the element.

If you use the array_splice() method, you can use the returned key value directly in the array_search() function to delete elements. Here is a sample code that uses the array_search() and array_splice() functions to remove elements of a specified value from an array:

$numbers = array(1, 2, 3, 4, 5, 6);
$key = array_search(3, $numbers); //查找值为3的元素的键值
array_splice($numbers, $key, 1); //删除查找到的元素
print_r($numbers);

Conclusion

In PHP, you can easily remove specified elements from an array using the unset() method and the array_splice() method. If you need to delete multiple elements, you can call the key value of the element to be deleted multiple times in the unset() method, or use the array_splice() method to delete multiple elements at once. If you need to delete an element with a specified value, you can use the array_search() function to find the key value of the element, and use unset() or array_splice() method to delete the element.

Hope this article can help you easily delete specified elements in an array in PHP programming.

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