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

<?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));

@php_program

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