How to remove multidimensional array keys in php

In PHP development, we often use multi-dimensional arrays to store and process data. But in some cases, we need to remove the keys of a multidimensional array and keep only the values. This article will discuss how to implement this function.

1. array_values() function

PHP provides the array_values() function, which can renumber all the values ​​in an array and return a new array. The syntax of this function is as follows:

array array_values ( array $array )

Among them, $array represents the array to be processed.

The example is as follows:

$arr = array(
    'fruit' => array('apple', 'banana', 'orange'),
    'vegetable' => array('tomato', 'potato', 'carrot')
);

$newArr = array_values($arr);

print_r($newArr);

The output result is:

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

    [1] => Array
        (
            [0] => tomato
            [1] => potato
            [2] => carrot
        )

)

It can be seen that the keys of the multi-dimensional array have been removed, leaving only the values.

2. Using loops

In addition to using the array_values() function, we can also remove the keys of multi-dimensional arrays through loops. The specific idea is to iterate each element in the array, remove its key and then put it back into a new array. The sample code is as follows:

function removeArraysKeys($array) {
    $newArray = array();
    foreach($array as $value) {
        if(is_array($value)) {
            $newArray[] = removeArraysKeys($value);
        } else {
            $newArray[] = $value;
        }
    }
    return $newArray;
}

$arr = array(
    'fruit' => array('apple', 'banana', 'orange'),
    'vegetable' => array('tomato', 'potato', 'carrot')
);

$newArr = removeArraysKeys($arr);

print_r($newArr);

The output result is also:

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

    [1] => Array
        (
            [0] => tomato
            [1] => potato
            [2] => carrot
        )

)

It can be seen that the keys of the array have been removed.

Summary

Whether you use the array_values() function or a loop, you can achieve the function of removing the keys of a multi-dimensional array. Which method to choose depends on the specific situation and personal preference. In practical applications, flexible selection of methods based on the structure and requirements of the array can make the code more concise and efficient.

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