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$a=Array ( '9' => Array ('17' => 17,'18' => 18 ),'10' => Array ( '19' => 19 ));
$ids = "";
foreach($a as $value){
$ids .= $ids?",".join(",",$value):join(",",$value);
}
echo $ids;
$ar = array(
9 => array(
17 => 17,
19 => 18,
),
10 => array(
19 => 19,
),
);
function foo($a) {
$r = '';
if(! is_array($a)) return $a;
foreach($a as $v) {
$r .= ($r ? ',' : '') . foo($v);
}
return $r;
}
echo foo($ar);
输出:17,18,19