Remove Smallest and Largest Elements from PHP Array
Approach 1: Using sort() and array_shift()/array_pop() functions
The first approach involves sorting the array and removing the first and last elements using array_shift() and array_pop() functions.
- Sort the array: Use the sort() function to sort the array in ascending order.
- Remove the Smallest Element: Use the array_shift() function to remove the first element (smallest element) of the sorted array.
- Remove the Largest Element: Use the array_pop() function to remove the last element (largest element) of the sorted array.
Example: This example shows the implementation of the above-explained approach.
<?php
function removeSmallLarge($arr) {
if (count($arr) <= 2) {
// If array has 2 or fewer elements,
// return an empty array
return [];
}
// Sort array in ascending order
sort($arr);
// Remove the smallest element
array_shift($arr);
// Remove the largest element
array_pop($arr);
return $arr;
}
// Driver code
$arr = [5, 2, 8, 1, 3, 7];
$res = removeSmallLarge($arr);
print_r($res);
?>
Output:
Approach 2: Using max(), min(), and array_filter() functions
This approach uses the PHP max(), min(), and array_filter() functions to remove the smallest and largest elements without sorting the array.
- Find the Smallest and Largest Elements: Use the min() and max() functions to find the smallest and largest elements.
- Filter the Array: Use the array_filter() function to remove the smallest and largest elements from the array.
Example: This example shows the implementation of the above-explained approach.
<?php
function removeSmallLarge($arr) {
if (count($arr) <= 2) {
// If array has 2 or fewer elements,
// return an empty array
return [];
}
$minVal = min($arr);
$maxVal = max($arr);
// Filter out the smallest
// and largest elements
$res = array_filter($arr,
function($val) use ($minVal, $maxVal) {
return $val !== $minVal && $val !== $maxVal;
});
return array_values($res);
}
// Driver code
$arr = [5, 2, 8, 1, 3, 7];
$res = removeSmallLarge($arr);
print_r($res);
?>
Output
Array
(
[0] => 5
[1] => 2
[2] => 3
[3] => 7
)
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