How to convert a php array into an array without keys

In PHP programming, array is one of the most commonly used data types, which can save multiple values ​​and access them sequentially. Each value can be referenced by an index (also called a key). But sometimes we need to convert a PHP array into a simple array without keys, this article will show you how to do this.

PHP Array Basics

In PHP, you can declare an array in the following two ways:

• Use the array() function, that is, $array = array (value1, value2, …);
• Use square brackets [], that is, $array = [value1, value2, …].

Among them, value1, value2, etc. represent the values ​​in the array, which can be any PHP data type, such as strings, numbers, arrays, objects, etc. In both methods, keys are assigned automatically starting from 0 by default.

For example, the array $arr created by the following code has three elements:

$arr = array("apple", "banana", "orange");

The keys of this array are 0, 1 and 2, and the corresponding values ​​are "apple" and "banana" " and "orange".

Normally, to access a value in an array, you need to use the corresponding key. For example, the following code will output the second element in the array $arr:

echo $arr[1];     // 输出 "banana"

If you want to loop through each element in the array, you can use a for or foreach loop. For example, the following code outputs each element in the array $arr:

for ($i = 0; $i 
The output results of both pieces of code are "apple banana orange". 
Convert PHP array to an array without keys
Sometimes, we need to convert a PHP array into a simple array without keys. For example, when you need to pass an array to some function, an array without keys is more suitable. In PHP, converting an array to an array without keys is actually easy, just use the array_values() function. This function returns a new array containing all the values ​​in the array, and the keys of the original array will be re-indexed as numbers starting from 0. 
For example, the following code converts the array $arr into a new array $new_arr without a key: 
$arr = array("apple", "banana", "orange");
$new_arr = array_values($arr);
 Outputs the value of the array $new_arr without a key: 
print_r($new_arr);       // 输出 Array ( [0] => apple [1] => banana [2] => orange )
 It can be seen that the keys of array $new_arr are 0, 1 and 2 respectively, which are the same as the keys of original array $arr, but these keys have no meaning. To access each value in the new array, just use their index, for example: 
echo $new_arr[0];        // 输出 "apple"
Summary
Converting a PHP array to an array without keys is very simple, just Just use the array_values() function. This function returns a new array without keys, and the keys of the original array are re-indexed to numbers 0, 1, 2... This method works with any type of PHP array, whether defined via the array() function or square brackets []. 
Arrays without keys are usually used when an array needs to be passed to some functions. This kind of array can simplify the code and improve the readability and maintainability of the program. 

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