php convert associative array to index array

In PHP, an associative array is an array composed of key-value pairs, while an index array is an array with integer values as keys. Sometimes we may need to convert an associative array into an indexed array, which can facilitate some array operations.

The following are some methods that can be used to convert an associative array into an indexed array:

1. array_values() function

PHP built-in function array_values() can return All values in the array and reconstruct them into a new indexed array.

Example:

$assocArr = array('a' => 'apple', 'b' => 'banana', 'c' => 'cherry'); $indexedArr = array_values($assocArr); print_r($indexedArr);

Output:

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

With this method the values of the associative array can be rearranged into a new indexed array, but since the key names are discarded , so this method cannot retain the original key-value pairs.

2. Use forced type conversion

We can convert an array into an object first, and then force it into an array, so that we can get a new index array .

Example:

$assocArr = array('a' => 'apple', 'b' => 'banana', 'c' => 'cherry'); $indexedArr = (array) $assocArr; print_r($indexedArr);

Output:

Array ( [a] => apple [b] => banana [c] => cherry )

This method also does not retain the original key name.

3. Manually traverse and construct a new array

This method is the most direct and flexible, we can manually traverse the array and store its values into a new index array middle.

Example:

$assocArr = array('a' => 'apple', 'b' => 'banana', 'c' => 'cherry'); $indexedArr = array(); foreach ($assocArr as $value) { $indexedArr[] = $value; } print_r($indexedArr);

Output:

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

This method can retain the original key names and values, but since it requires manual traversal of the array, the code is lengthy and not concise enough.

To sum up, we can choose a specific method according to the specific situation to convert the associative array into an index array. No matter which method is used, we must pay attention to ensuring the readability and maintainability of the code.

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