My data variable:
1=icon_arrow.gif,2=icon_arrow.gif,3=icon_arrow.gif
I need it to be grouped by the value after =, so in this case it should look like this:
$out = array('icon_arrow.gif' => '1, 2, 3');
The 'icon_arrow.gif' field need to be unique, and can't repeat.
How it can be done?
Initialize an array:
$array = array();
Explode the input by ,, store results as an array based on a sub-explode of it by =:
foreach(explode(',', $string) as $p)
{
list($i, $n) = explode('=',$p);
$array[$n][] = $i;
}
Implode then the result with ,:
foreach($array as &$v)
$v = implode(', ', $v);
unset($v);
Done.
Just for fun. With no special chars this should also work.
$str="1=icon_arrow.gif,2=icon_arrow.gif,3=icon_arrow.gif,4=x.gif";
$str = str_replace(',', '&', $str);
parse_str($str, $array);
$result = array();
foreach($array as $k=>$v)
$result[$v] = (isset($result[$v]) ? $result[$v] . ", " : "") . $k;
