How to remove identical elements from an array in php

php method to remove identical elements in an array: 1. Use the "array_unique()" function, which can be used to remove duplicate elements in an array. This function will return a new array containing the original array The only element of Create a new array using the values ​​of the original array as keys, and duplicate values ​​will be automatically removed.

The operating environment of this article: Windows 10 system, php8.1.3 version, dell g3 computer.

PHP is a very popular server-side programming language that is widely used in website development and application development fields. In PHP, an array is a commonly used data structure that is often used to store and process data. Sometimes, we may need to remove duplicate elements from an array to simplify operations or reduce redundant data. This article will introduce several methods to remove identical elements from an array in PHP.

Method 1: Use array_unique() function

PHP provides a built-in function array_unique(), which can be used to remove duplicate elements from an array. This function will return a new array containing the unique elements from the original array.

The sample code is as follows:

<?php
$array = array("apple", "banana", "apple", "orange", "banana");
$result = array_unique($array);
print_r($result);
?>

Output result:

Array
(
[0] => apple
[1] => banana
[3] => orange
)

Method 2: Use a loop to traverse the array

In addition to using built-in functions In addition to array_unique(), we can also use looping through the array to remove duplicate elements. In this method we can use another array to store the unique elements and on each iteration check if the element is already present in the new array.

The sample code is as follows:

<?php
$array = array("apple", "banana", "apple", "orange", "banana");
$result = array();
foreach ($array as $value) {
if (!in_array($value, $result)) {
$result[] = $value;
}
}
print_r($result);
?>

Output result:

Array
(
[0] => apple
[1] => banana
[3] => orange
)

Method 3: Use array_flip() function

We can still Use the array_flip() function to remove duplicate elements from an array. This function creates a new array using the values ​​of the original array as keys.

The sample code is as follows:

<?php
$array = array("apple", "banana", "apple", "orange", "banana");
$result = array_keys(array_flip($array));
print_r($result);
?>

Output result:

Array
(
[0] => apple
[1] => banana
[3] => orange
)

In the above code, the array_flip() function uses the value of the original array as the key, and will automatically remove duplicates value. We then use the array_keys() function to return the keys of the new array and store them in $result.

In summary

There are many ways to remove duplicate elements from an array in PHP. We can achieve this using the array_unique() function, looping over the array, or using the array_flip() function. Depending on the specific situation, we can choose the method that best suits us to handle repeated elements in the array to make subsequent operations more convenient.

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