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PHP Array Exercises : Generate an array with a range taken from a string

PHP Array: Exercise-29 with Solution

Write a PHP program to generate an array with a range taken from a string.

Sample Solution:

PHP Code:

<?php
function string_range($str1) 
{
  preg_match_all("/([0-9]{1,2})-?([0-9]{0,2}) ?,?;?/", $str1, $a);
  $x = array ();
  foreach ($a[1] as $k => $v) 
  {
    $x  = array_merge ($x, range ($v, (empty($a[2][$k])?$v:$a[2][$k])));
  }
  return ($x);
}
$test_string = '1-2 18-20 9-11';
print_r(string_range($test_string));
?>

Sample Output: 

Array                                                       
(                                                           
    [0] => 1                                                
    [1] => 2                                                
    [2] => 18                                               
    [3] => 19                                               
    [4] => 20                                               
    [5] => 9                                                
    [6] => 10                                               
    [7] => 11                                               
)

Flowchart:

Flowchart: PHP - Generate an array with a range taken from a string

PHP Code Editor:

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Previous: Write a PHP script to sort an array in reverse order (highest to lowest).
Next: Write a PHP program to create a letter range with arbitrary length.

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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