PHP Array Exercises : Inserts a new item in an array in any position
PHP Array: Exercise-7 with Solution
Write a PHP script that inserts a new item in an array in any position.
Sample Solution:
PHP Code:
<?php
$original = array( '1','2','3','4','5' );
echo 'Original array : '."\n";
foreach ($original as $x)
{echo "$x ";}
$inserted = '$';
array_splice( $original, 3, 0, $inserted );
echo " \n After inserting '$' the array is : "."\n";
foreach ($original as $x)
{echo "$x ";}
echo "\n"
?>
Sample Output:
Original array : 1 2 3 4 5 After inserting '$' the array is : 1 2 3 $ 4 5
Flowchart:
PHP Code Editor:
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Previous: Write a PHP script which decodes the specified JSON string.
Next: Write a PHP script to sort the specified associative 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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