foreach matches as key value from matches key to matches key foobar fr

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foreach ($matches[1] as $key=>$value)
{
$from = $matches[2][$key];
$to = $matches[4][$key];
$foobar[$from] = 0;
$foobar[$to] = 0;
}
foreach ($foobar as $key=>$value);
{
echo "$key = $value\n";
}