php中在foreach中使用foreach ($arr as &$value) 直接赋值的方法

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< ?php
$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
    $value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
?>

< ?php $arr = array(1, 2, 3, 4); foreach ($arr as &$value) { $value = $value * 2; } // $arr is now array(2, 4, 6, 8) ?>

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< ?php
foreach (array(1, 2, 3, 4) as &$value) {
    $value = $value * 2;
}
?>

< ?php foreach (array(1, 2, 3, 4) as &$value) { $value = $value * 2; } ?>