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Parse a string, and convert it into a series of sequential numbers.
<?php
/**
* Parse a string, and convert it into a series of sequential numbers.
* It works similar to Acrobat's print specified pages input box.
*
* Examples:
*
* input: "1, 2, 3, 4, 5, 6" --> output: 1, 2, 3, 4, 5, 6
* input: "1-6" --> output: 1, 2, 3, 4, 5, 6
* input: "1-6" --> output: 1, 2, 3, 4, 5, 6
* input: "1 - -6" --> output: 1, 2, 3, 4, 5, 6
* input: "0 - 0" --> output: 0
* input: "1, 4-6, 2" --> output: 1, 2, 4, 5, 6
* input: "6,3-1" --> output: 1, 2, 3, 6
*
* // Sample Usage:
* $range = range_string("6, 3-1");
*
* @author Jay Williams <myd3.com>
* @license MIT License
* @link http://gist.github.com/125557
*/
define('RANGE_ARRAY_SORT', 1);
define('RANGE_ARRAY', 2);
define('RANGE_STRING_SORT', 3);
define('RANGE_STRING', 4);
function range_string($range_str, $output_type = RANGE_ARRAY_SORT)
{
// Remove spaces and nother non-essential characters
$find[] = "/[^\d,\-]/";
$replace[] = "";
// Remove duplicate hyphens
$find[] = "/\-+/";
$replace[] = "-";
// Remove duplicate commas
$find[] = "/\,+/";
$replace[] = ",";
$range_str = preg_replace($find, $replace, $range_str);
// Remove any commas or hypens from the end of the string
$range_str = trim($range_str,",-");
$range_out = array();
$ranges = explode(",", $range_str);
foreach($ranges as $range)
{
if(is_numeric($range) || strlen($range) == 1)
{
// Just a number; add it to the list.
$range_out[] = (int) $range;
}
else if(is_string($range))
{
// Is probably a range of values.
$range_exp = preg_split("/(\D)/",$range,-1,PREG_SPLIT_DELIM_CAPTURE);
$start = $range_exp[0];
$end = $range_exp[2];
if($start > $end)
{
for($i = $start; $i >= $end; $i -= 1)
{
$range_out[] = (int) $i;
}
}
else
{
for($i = $start; $i <= $end; $i += 1)
{
$range_out[] = (int) $i;
}
}
}
}
switch ($output_type) {
case RANGE_ARRAY_SORT:
$range_out = array_unique($range_out);
sort($range_out);
case RANGE_ARRAY:
return $range_out;
break;
case RANGE_STRING_SORT:
$range_out = array_unique($range_out);
sort($range_out);
case RANGE_STRING:
default:
return implode(", ", $range_out);
break;
}
}
?>
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