PHP Exercises: Filter out the elements of a given array, that have one of the specified values

Last update on April 19 2025 11:49:11 (UTC/GMT +8 hours)

92. Filter Array to Exclude Specified Values

Write a PHP program to filter out the elements of a given array, that have one of the specified values.

Sample Solution:

PHP Code:

<?php
// Licence: https://bit.ly/2CFA5XY

// Function definition for 'without' that takes an array reference and a variable number of parameters as input
function without($items, ...$params)
{
    // Use 'array_diff' to remove elements specified by the parameters from the array
    // Use 'array_values' to reindex the array after removal
    return array_values(array_diff($items, $params));
}

// Call 'without' with an array and specified values to be removed, then display the result using 'print_r'
print_r(without([2, 1, 2, 3], 1, 2));

?>

Explanation:

Function Definition:

The function without is defined to accept an array reference ($items) and a variable number of parameters (...$params).
The ...$params syntax allows the function to accept multiple arguments after the first array parameter.

Removing Specified Elements:

Inside the function, array_diff($items, $params) is used:

This function compares the $items array with the values in $params and returns a new array containing only the values from $items that are not in $params.

Reindexing the Array:

The result of array_diff is passed to array_values(), which reindexes the resulting array, ensuring that the keys are sequential integers starting from 0.

Purpose:

The without function effectively creates a new array that excludes any elements specified in the parameters.

Function Call:

The function is called with an array [2, 1, 2, 3] and the values 1 and 2 to be removed.
The result of this call is print_r(without([2, 1, 2, 3], 1, 2));, which outputs [3], as 1 and 2 are removed from the original array.

Displaying Results:

The final result, which is the array [3], is displayed using print_r.

Output:

Array
(
    [0] => 3
)

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to iterate over an array and filter out elements that are in a given exclusion list.
Write a PHP function to return a new array containing only the elements not matching any value in a specified blacklist.
Write a PHP script to use a custom callback to remove unwanted items from an array and display the result.
Write a PHP script to compare each array element against a set of forbidden values and output the filtered array.

PHP Code Editor:

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