从数组中删除所有值，同时保持键完整

问题描述

我真的必须执行此操作来重置数组吗?

Do I really have to do this to reset an array ??

foreach ($array as $i => $value) {
    unset($array[$i]);
}

这个更有意义，因为前一个等价于$array=array();

this one makes more sense, as the previous one is equivalent to $array=array();

foreach ($array as $i => $value) {
    $array[$i]=NULL;
}

推荐答案

定义此函数并在需要时调用它:

Define this function and call it whenever you need it:

function erase_val(&$myarr) {
    $myarr = array_map(create_function('$n', 'return null;'), $myarr);
}

// It's call by reference so you don't need to assign your array to a variable.
// Just call the function upon it
erase_val($array);

仅此而已！

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