PHP Array Exercises : Delete an element from an array
PHP Array: Exercise-4 with Solution
$x = array(1, 2, 3, 4, 5);
Delete an element from the above array. After deleting the element, integer keys must be normalized.
Sample Solution:
PHP Code:
<?php
$x = array(1, 2, 3, 4, 5);
var_dump($x);
unset($x[3]);
$x = array_values($x);
echo '
';
var_dump($x);
?>
Sample Output:
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) } array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(5) }
Flowchart:
PHP Code Editor:
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Previous: Create a PHP script which displays the capital and country name from the specified array $ceu. Sort the list by the name of the capital.
Next: Write a PHP script to get the first element of the specified array.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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