Using PHP's array_values() Function to Reindex and Convert Arrays

In PHP development, arrays are a fundamental data structure, and PHP offers a rich set of functions for array manipulation. This article introduces the array_values() function, which returns a new array containing all the values of the original array with keys re‑indexed starting from 0.

The function is straightforward: pass any array as the argument, and it returns a copy where the keys are reset. This is useful for re‑indexing numeric arrays or converting associative arrays into simple indexed arrays.

Example with a regular indexed array:

<?php
$array = array("apple", "banana", "cherry");
$newArray = array_values($array);
print_r($newArray);
?>

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => cherry
)

Example with an associative array:

<?php
$student = array(
    "name" => "张三",
    "age" => 18,
    "score" => 95
);
$newArray = array_values($student);
print_r($newArray);
?>

Output:

Array
(
    [0] => 张三
    [1] => 18
    [2] => 95
)

Note that array_values() returns a new array, not a reference to the original. Modifying the new array does not affect the original array:

<?php
$array = array("apple", "banana", "cherry");
$newArray = array_values($array);
$newArray[0] = "orange";
print_r($newArray);   // Array ( [0] => orange [1] => banana [2] => cherry )
print_r($array);      // Array ( [0] => apple [1] => banana [2] => cherry )
?>

This demonstrates that changes to the returned array are isolated from the source array.

In summary, array_values() is a practical function for resetting array keys and converting associative arrays to indexed arrays, helping improve code readability and maintainability in PHP projects.

Additional resources: Java learning materials , C language learning materials , Frontend learning materials , and other programming resources.