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How to remove key names from multidimensional array in PHP
- PHPzOriginal
- 2023-04-19 11:38:15463browse
PHP, as a popular programming language, often uses arrays when processing data. As a container for storing large amounts of data, arrays can store different types of values, including numbers, strings, objects, etc. In PHP, sometimes we need to traverse a multi-dimensional array and remove the keys in the array, leaving only the values. This article will introduce how to remove the key names of multi-dimensional arrays in PHP.
1. Understanding PHP arrays
In PHP, arrays are containers used to store values of different data types. Arrays can be created in two ways:
1. Use the array() function:
$fruits = array("Apple", "Banana", "Pear");
2. Use abbreviation:
$fruits = ["Apple", "Banana", "Pear"];
PHP arrays can contain other arrays (multidimensional arrays), And each array element is assigned a key name. Key names can be integers or strings.
For example:
$person = array("Name" => "Xiao Ming", "Age" => "18", "Gender" => "Male");
Key names can be used to reference and access the value of an element. The following is an example of accessing array elements:
echo $person["name"]; // Output Xiaoming
2. Remove the key name of the PHP multidimensional array
Yes Sometimes, we need to traverse a multi-dimensional array and only retain the values in the array, removing the key names. PHP provides many methods to achieve this function, and this article introduces two of them.
1. Use array_values() function
array_values() function returns a new array containing all the values in the original array, but the key names are reset to numeric indexes starting from 0 . This method does not modify the original array.
For example:
$person = array("Name" => "Xiao Ming", "Age" => "18", "Gender" => "Male");
$values = array_values($person);
print_r($values);
This will output:
Array
(
[0] => 小明 [1] => 18 [2] => 男
)
2. Traverse the array and use the unset() function to remove the key name
Another method is to use a loop to traverse the array and use the unset() function to remove the key name. This method modifies the original array, so use it with caution.
For example:
$person = array("Name" => "Xiao Ming", "Age" => "18", "Gender" => "Male");
foreach ($person as $key => $value) {
unset($person[$key]); $person[] = $value;
}
print_r($person);
This will output:
Array
(
[0] => 小明 [1] => 18 [2] => 男
)
3. Summary
Arrays in PHP are very powerful data structures and support multi-dimensional arrays. When processing data, sometimes it is necessary to remove the key names in the array to facilitate other operations. PHP provides the array_values() function and the traversal method using the unset() function to implement this function. Choose the most suitable method according to actual needs.
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