How to eliminate duplicate options in php array

PHP is a popular web programming language, and its arrays are a very useful feature. However, sometimes we need to eliminate duplicate options from an array. This article will introduce how to use PHP array functions to achieve this function.

First, we need to define an array to demonstrate this process. In this article we will use an array with repeating options. The code is as follows:

$myArray = array('apple', 'banana', 'orange', 'apple', 'cherry', 'cherry', 'kiwi');

Now, we need to eliminate duplicate options in this array. We can use the array_unique function to achieve this goal. This function will return a new array containing only the unique items present in the original array. The code is as follows:

$newArray = array_unique($myArray);

Now we can use the print_r function to print the new array so that we can see the results of eliminating duplicates. The code is as follows:

print_r($newArray);

The output should look like this:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [4] => cherry
    [6] => kiwi
)

We can see that the new array only contains the unique items that appeared in the original array. All duplicates have been removed.

In addition to the array_unique function, we can also use the array_flip function and the array_keys function to achieve this goal. This method has a few extra steps, but it may be more efficient than array_unique in some situations. The code is as follows:

$flipArray = array_flip($myArray);
$newArray = array_keys($flipArray);

Similarly, we can use the print_r function to print the new array. The code is as follows:

print_r($newArray);

The output should be the same as using the array_unique function.

Overall, it is easy to eliminate duplicate options using PHP array functions. We only need to use the array_unique function or the combination of the array_flip function and the array_keys function. These functions are useful if you need to eliminate duplicate options from an array.

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