How to remove array key in php (two methods)

PHP is an open source server-side scripting language that is widely used for web development. Array is a data type in PHP that allows us to store multiple values ​​in a variable. Arrays usually consist of a number of distinct elements. In some cases, we need to remove the key of the array and only keep the value. This article will introduce how to remove array keys in PHP.

What is an array key

In PHP, an array is an ordered list used to store data. Each element has an index, which can be a number or a string. This is what we call a key. Key is usually used to reference a value in an array.

The following is a simple example:

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

In this example, the keys of the $fruits array are 0, 1, 2. We can access them through the following code:

echo $fruits[0]; //输出 "apple"
echo $fruits[1]; //输出 "banana"
echo $fruits[2]; //输出 "orange"

How to remove key

If we want to remove the key of the array without changing the array value, we can use the following two methods:

Method 1: Use the array_values() function

The array_values() function in PHP can return a new array containing all the values ​​of the array, and the keys in the new array will be re-indexed in numerical form. For example:

$fruits = array("apple" => 1, "banana" => 2, "orange" => 3);
$values = array_values($fruits);
print_r($values);

This will output:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

In this example, we use the array_values() function to return a new array containing only the values ​​of the $fruits array. By printing out this array, we can see that there are no original keys in the new array.

Method 2: Use loop structure

You can also use loop structure to remove the key of the array. For example, the following code can remove the key from the $fruits array:

$fruits = array("apple" => 1, "banana" => 2, "orange" => 3);
$values = array();
foreach ($fruits as $value) {
    $values[] = $value;
}
print_r($values);

This will output:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

In this example, we use a loop structure to store the values ​​​​in the $fruits array into another array $values. Since we did not add a key to the new array, the values ​​in the new array will be re-indexed numerically.

Conclusion

In PHP, array is a very useful data type that can store multiple values ​​​​in one variable. Sometimes, we need to remove the key and only keep the value. We can achieve this using the array_values() function or using a loop structure. Taking one of these methods will return a new array in which the values ​​will be numerically re-indexed.

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