问php -从包含模式的字符串中提取数字

EN

$string = '4-1,4-1,,,1-1,,5-4,2-1,';

preg_match_all('/(\d+)-/', $string, $matches);
// search for 1 or more digits that are followed by a hyphen, and return all matches

print_r($matches[1]);

Array
(
    [0] => 4
    [1] => 4
    [2] => 1
    [3] => 5
    [4] => 2
)

$couples = explode(",", $data);
$values = Array();

foreach ($couples as $couple)
{
    if ($couple != "")
    {
        $split = explode("-", $couple);
        $values[] = $split[0];
    }
}