PHP 5.5 version update: How to use the array_diff function to calculate the difference of an array

PHP version 5.5 update: How to use the array_diff function to calculate the difference of an array

In PHP programming, arrays are a very commonly used data structure. In the processing of arrays, sometimes it is necessary to perform some operations on the array, such as calculating the difference of the array. In the update to PHP 5.5, the array_diff function was introduced, which can easily calculate the difference of arrays.

The array_diff function is a very practical function used to calculate the difference of multiple arrays. Its syntax is as follows:
array array_diff (array $array1, array $array2 [, array $...])

Among them, array1 is the first array, array2 is the second array, and then The parameters are other arrays.

Below we use a code example to demonstrate how to use the array_diff function to calculate the difference set of an array.

First, we create an array named $fruits to store the names of the fruits:

$fruits = array("苹果", "香蕉", "橙子", "草莓", "李子");

Then, we create an array named $removed_fruits to store the names of the fruits to be deleted Name of the fruit:

$removed_fruits = array("香蕉", "草莓");

Next, we use the array_diff function to calculate the difference set of the array, and remove the fruit to be deleted from the fruit array:

$result = array_diff($fruits, $removed_fruits);

Finally, we can use the var_dump function to Output the calculated difference array:

var_dump($result);

Running the above code, we can get the following output:

array(3) {
  [0]=>
  string(6) "苹果"
  [2]=>
  string(6) "橙子"
  [3]=>
  string(6) "李子"
}

From the output results, we successfully removed the deleted fruits from the original fruits Removed from the array, the difference array is obtained.

In addition to two arrays, we can also use more parameters to calculate the difference set of multiple arrays, for example:

$result = array_diff($array1, $array2, $array3);

When calculating the difference set, the array_diff function will compare the arrays elements and returns the elements that exist in the first array but not in the other arrays, thus getting the difference set.

It should be noted that the array_diff function uses value comparison to perform calculations, that is, it only compares the values ​​in the array, not the key names. If you need to compare key names, you can use the array_diff_assoc function.

In PHP programming, the array_diff function is very practical. When we need to calculate the array difference, it can provide a simple and effective solution. Using the array_diff function, we can easily process arrays to meet different programming needs.

Summary: In this article, we introduced the array_diff function in the PHP 5.5 version update and how to use this function to calculate the difference of an array. Through the demonstration of code examples, we show how to correctly use the array_diff function to process arrays and obtain the calculated difference results. The array_diff function is a very practical function in PHP programming, which can provide convenient and efficient solutions when processing arrays.

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