如何解决每个PHP这个不推荐使用的功能 [英] How to resolve this deprecated function each php

问题描述

在PHP 7.2中，不推荐使用each. 文档说:

With PHP 7.2, each is deprecated. The documentation says:

警告该功能自PHP 7.2.0起已被弃用.强烈建议不要使用此功能.

Warning This function has been DEPRECATED as of PHP 7.2.0. Relying on this function is highly discouraged.

如何更新代码以避免使用它?以下是一些示例:

How can I update my code to avoid using it? Here are some examples:

$ar = $o->me;
reset($ar);
list($typ, $val) = each($ar);

$out = array('me' => array(), 'mytype' => 2, '_php_class' => null);
$expected = each($out);

for(reset($broken);$kv = each($broken);) {...}

list(, $this->result) = each($this->cache_data);

// iterating to the end of an array or a limit > the length of the array
$i = 0;
reset($array);
while( (list($id, $item) = each($array)) || $i < 30 ) {
    // code
    $i++;
}

推荐答案

在前两个示例中，可以使用key()和current()分配所需的值.

For your first two example cases, you could use key() and current() to assign the values you need.

$ar = $o->me;   // reset isn't necessary, since you just created the array
$typ = key($ar);
$val = current($ar);

$out = array('me' => array(), 'mytype' => 2, '_php_class' => null);
$expected = [key($out), current($out)];

在这种情况下，您可以使用next()后移光标，但是如果其余代码不依赖于此，则没有必要.

In those cases, you can use next() to advance the cursor afterward, but it may not be necessary if the rest of your code doesn't depend on that.

1. 对于第三种情况，我建议只使用foreach()循环，然后在循环内分配$kv.

1. For the third case, I'd suggest just using a foreach() loop instead and assigning $kv inside the loop.

    foreach ($broken as $k => $v) {
        $kv = [$k, $v];
    }

1. 对于第四种情况，键似乎在list()中被忽略，因此您可以分配当前值.

1. For the fourth case, it looks like the key is disregarded in list(), so you can assign the current value.

    $this->result = current($this->cache_data);

与前两种情况一样，可能有必要使用next()来移动光标，具体取决于其余代码与$this->cache_data交互的方式.

Like the first two cases, it may be necessary to advance the cursor with next() depending on how the rest of your code interacts with $this->cache_data.

1. 第五个可以替换为for()循环.

    reset($array);
    for ($i = 0; $i < 30; $i++) {
        $id = key($array);
        $item = current($array);
        // code
        next($array);
    }

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