How to find the difference between two arrays in php

php method to find the difference between two arrays: 1. Define two arrays `$array1` and `$array2`; 2. Use the `array_diff()` function to combine `$array1` and `$ The difference between array2` is stored in the `$diff` variable; 3. Use the `print_r()` function to print out the difference.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

In PHP programming, we often encounter situations where we need to solve the difference set of two arrays. A difference set is an element that exists in one array but does not exist in another array. In this article, we will explore how to find the difference of two arrays using PHP programming language.

Let us consider how to find the difference between two arrays. In PHP, there are several ways to achieve this goal. The following is one of the methods:

$array1=[1,2,3,4,5];
$array2=[3,4,5,6,7];
$diff=array_diff($array1,$array2);
print_r($diff);
?>

In the above code

1, we define two arrays `$array1` and `$array2`.

2. We use the `array_diff()` function to convert `$array1` The difference from `$array2` is stored in the `$diff` variable.

3. We use the `print_r()` function to print out the difference set.

In the result of running the above code, we will get the following output:

Array
(
[0]=>1
[1]=>2
)

As can be seen from the output result, the elements `1` and `2` in `$array1` are in ` $array2` does not exist, so they are included in the difference set `$diff` middle.

In addition to using the `array_diff()` function, we can also use loops and conditional statements to manually calculate the difference between two arrays. The following is another implementation:

$array1=[1,2,3,4,5];
$array2=[3,4,5,6,7];
$diff=[];
foreach($array1as$element){
if(!in_array($element,$array2)){
$diff[]=$element;
}
}
print_r($diff);
?>

1In the above code, we first create an empty array `$diff`

2, and then, we use `foreach` to loop through` for each element in $array1` and use The `in_array()` function checks whether it exists in `$array2`. If the element is not in `$array2` we add it to `$diff` in the array.

3. We use the `print_r()` function to print out the difference set.

No matter which method is used, the final output result should be the same:

Array
(
[0]=>1
[1]=>2
)

To summarize, we can use `array_diff()` function or use loops and conditional statements to find the difference between two arrays. This method is very useful in PHP programming and can help us solve many practical problems. I hope this article can be helpful to you!

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