How to delete an array from another array in php

In PHP, you can use the array_diff() function to delete an array from another array. This article will introduce how to use this function and provide some practical examples.

The syntax of the array_diff() function is as follows:

array_diff($array1, $array2, $array3, ... , $arrayN)

Among them, $array1, $array2, and other arrays represent the arrays to be compared. This function will return the elements in $array1 that are different from all other arrays.

The following example will explain the use of this function in more detail:

Example 1: Delete an array from another array

Suppose you have two arrays $arr1 and $arr2, you want to remove from $arr1 all elements contained in $arr2. In this case, you can use the array_diff() function to achieve this:

$arr1 = array('apple', 'banana', 'orange', 'pear');
$arr2 = array('banana', 'pear');
$new_arr = array_diff($arr1, $arr2);
print_r($new_arr);

This code will output the following results:

Array
(
    [0] => apple
    [2] => orange
)

In this example, $arr1 contains four elements: 'apple', 'banana', 'orange' and 'pear'. And $arr2 removes 'banana' and 'pear'. After calling the array_diff() function, the array $new_arr is returned, which contains all the elements in $arr1 that are not included in $arr2. Here, the elements 'banana' and 'pear' are excluded from the output.

Example 2: Compare multiple arrays

array_diff() function has the ability to compare multiple arrays. For example, you can compare three arrays and find the unique values ​​in these arrays:

$arr1 = array('apple', 'banana', 'orange', 'pear');
$arr2 = array('banana', 'pear');
$arr3 = array('apple', 'orange', 'mango');
$new_arr = array_diff($arr1, $arr2, $arr3);
print_r($new_arr);

This code will output the following results:

Array
(
    [0] => pineapple
)

Here, $new_arr only contains arr1 and not The elements in $arr2 and $arr3. In this case, 'pineapple' is the only value.

Conclusion

array_diff() function is a very commonly used function in PHP that allows you to remove all elements from one array in another array. It is a value-based comparison, so it does not specify at which position in the array the element is deleted. You can also compare multiple arrays to find unique values. No matter which method you use, the array_diff() function is always a very useful tool.

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