在PHP中删除foreach循环中的项目[重复]

I have a foreach loop where I want to unset an item from an array if certain conditions are met, like this:

foreach ($array as $element) {
    if (conditions) {
        unset($element);
    }
}

But the element is not unset after that. What am I doing wrong? Am I unsetting a reference to the actual element or something like that?

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Simple Solution, unset the element by it's index:

foreach ($array as $key => $element) {
    if (conditions) {
        unset($array[$key]);
    }
}

Just unsetting $element will not work, because this variable is not a reference to the arrays element, but a copy. Accordingly changing the value of $element will not change the array too.

An alternate method, you can pass the array element into the loop by reference by doing the following:

foreach($array as &$var) {
    unset($var);
}

This is useful because you then have direct access to the array element to change or delete as you wish without having to construct a new array or accessing by key. Any changes you make to $var affects the contents of $array.