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PHP Exercises: Remove duplicates from a sorted list

PHP: Exercise-35 with Solution

Write a PHP program to remove duplicates from a sorted list.

Input: (1,1,2,2,3,4,5,5)
Output: (1,2,3,4,5)

Sample Solution: -

PHP Code:

<?php
function remove_duplicates_list($list1) {
  $nums_unique = array_values(array_unique($list1));
  return $nums_unique ;
}
$nums = array(1,1,2,2,3,4,5,5);
print_r(remove_duplicates_list($nums));
?>

Sample Output: 

Array                                                       
(                                                           
    [0] => 1                                                
    [1] => 2                                                
    [2] => 3                                                
    [3] => 4                                                
    [4] => 5                                                
)

Flowchart:

Flowchart: Remove duplicates from a sorted list.

PHP Code Editor:

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Previous: Write a PHP program to check if the bits of the two given positions of a number are same or not.
Next: Write a PHP program to test if a given string occurs at the end of another given string.

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC