PHP Array Exercises : Create a multidimensional unique array for any single key index
PHP Array: Exercise-38 with Solution
Write a PHP function to create a multidimensional unique array for any single key index.
Sample Solution:
PHP Code:
<?php
// Define a function to filter unique values based on a specified key in a multidimensional array
function unique_array($my_array, $key) {
$result = array(); // Initialize an empty array to store the unique values
$i = 0; // Initialize a counter
$key_array = array(); // Initialize an array to keep track of encountered keys
// Iterate through each element in the input array
foreach($my_array as $val) {
// Check if the key value is not already present in the key array
if (!in_array($val[$key], $key_array)) {
$key_array[$i] = $val[$key]; // Store the key value in the key array
$result[$i] = $val; // Store the entire element in the result array
}
$i++; // Increment the counter
}
// Return the array containing unique values based on the specified key
return $result;
}
// Define an array of students with associated information
$students = array(
0 => array("city_id"=>"1", "name"=>"Sara", "mobile_num"=>"1111111111"),
1 => array("city_id"=>"2", "name"=>"Robin", "mobile_num"=>"2222222222"),
2 => array("city_id"=>"1", "name"=>"Sonia", "mobile_num"=>"3333333333"),
);
// Display the result of applying the unique_array function to the students array with the "city_id" key
print_r(unique_array($students, "city_id"));
?>
Output:
Array ( [0] => Array ( [city_id] => 1 [name] => Sara [mobile_num] => 1111111111 ) [1] => Array ( [city_id] => 2 [name] => Robin [mobile_num] => 2222222222 ) )
Flowchart:
PHP Code Editor:
Contribute your code and comments through Disqus.
Previous: Write a PHP script to count the total number of times a specific value appears in an array.
Next: Write a PHP program to remove duplicate values from an array which contains only strings or only integers.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.
https://www.w3resource.com/php-exercises/php-array-exercise-38.php
- Weekly Trends and Language Statistics
- Weekly Trends and Language Statistics