PHP Array Exercises : Remove a specified duplicate entry from an array
PHP Array: Exercise-44 with Solution
Write a PHP a function to remove a specified duplicate entry from an array.
Sample Solution:
PHP Code:
<?php
function array_uniq($my_array, $value)
{
$count = 0;
foreach($my_array as $array_key => $array_value)
{
if ( ($count > 0) && ($array_value == $value) )
{
unset($my_array[$array_key]);
}
if ($array_value == $value) $count++;
}
return array_filter($my_array);
}
$numbers = array(4, 5, 6, 7, 4, 7, 8);
print_r(array_uniq($numbers, 7));
?>
Sample Output:
Array ( [0] => 4 [1] => 5 [2] => 6 [3] => 7 [4] => 4 [6] => 8 )
Flowchart:
PHP Code Editor:
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Previous: Write a PHP script to merge two commas separated lists with unique value only.
Next: Write a PHP script to do a multi-dimensional difference, i.e. returns values of the first array that are not in the second array.
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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
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