PHP function introduction—array_combine(): Combine two arrays into an associative array

PHP function introduction—array_combine(): Combine two arrays into an associative array

In PHP, there are many practical functions that can help us process and operate arrays. One very useful function is array_combine(). This article will introduce the usage of this function and its sample code.

The array_combine() function uses the value of one array as the key name and the value of another array as the key value to merge the two arrays into a new associative array. This function is ideal for creating an array of dictionaries or combining two related arrays together.

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

array_combine(array $keys, array $values) : array

Among them, $keys is an array representing key names, and $values ​​is an array representing key values. The function return value is a new associative array. The two arrays must be the same length, otherwise the function will return false.

The following is an example showing how to use the array_combine() function:

$keys = ['apple', 'banana', 'orange'];
$values = ['red', 'yellow', 'orange'];

$fruits = array_combine($keys, $values);
print_r($fruits);

This code will output the following results:

Array
(
    [apple] => red
    [banana] => yellow
    [orange] => orange
)

In this example, we create Two arrays $keys and $values. The $keys array contains the name of the fruit, and the $values ​​array contains the color of the corresponding fruit. Then, we use the array_combine() function to combine these two arrays into a new associative array $fruits. Finally, we use the print_r() function to print out the $fruits array.

Through this example, we can see that the array_combine() function uses the value of the $keys array as the key name and the value of the $values ​​array as the key value, successfully merging the two arrays into one New associative array.

It should be noted that when using the array_combine() function, the lengths of the $keys and $values ​​arrays must be the same, otherwise the function will return false. In addition, if there are duplicate values ​​in the $keys array, only the key value corresponding to the last duplicate value will be retained in the final associative array.

Summary:
In PHP, the array_combine() function is a very practical function that can combine two arrays into a new associative array. We can use this function to create an array of dictionaries, merge two related arrays together, and more. Just remember to make sure the $keys and $values ​​arrays are the same length when using this function, and be careful to handle duplicate values.

I hope the introduction in this article can help you better understand and use the array_combine() function and improve your PHP programming skills.

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