PHP Array Exercises : Create a letter range with arbitrary length
PHP Array: Exercise-30 with Solution
Write a PHP program to create a letter range with arbitrary length.
Sample Solution:
PHP Code:
<?php
function letter_range($length)
{
$data_range = array();
$letters = range('A', 'Z');
for($i=0; $i<$length; $i++)
{
$position = $i*26;
foreach($letters as $ii => $letter)
{
$position++;
if($position <= $length)
$data_range[] = ($position > 26 ? $data_range[$i-1] : '').$letter;
}
}
return $data_range;
}
print_r(letter_range(7));
?>
Sample Output:
Array ( [0] => A [1] => B [2] => C [3] => D [4] => E [5] => F [6] => G )
Flowchart:
PHP Code Editor:
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Previous: Write a PHP program to generate an array with a range taken from a string.
Next: Write a PHP program to get the index of the highest value in an associative array.
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PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($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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