如何在 PHP 中将数组元素转换为字符串？

How to cast array elements to strings in PHP?

提问by acme

If I have a array with objects:

如果我有一个包含对象的数组：

$a = array($objA, $objB);

(each object has a __toString()-method)

（每个对象都有一个__toString()-method）

How can I cast all array elements to string so that array $acontains no more objects but their string representation? Is there a one-liner or do I have to manually loop through the array?

如何将所有数组元素转换为字符串，以便该数组不$a包含更多对象，而是它们的字符串表示形式？是否有单行或我必须手动循环遍历数组？

回答by Alix Axel

A one-liner:

单线：

$a = array_map('strval', $a);
// strval is a callback function

See PHP DOCS:

请参阅 PHP 文档：

array_map

数组映射

strval

斯特瓦尔

Enjoy! ;)

享受！;)

回答by Ben Everard

Not tested, but something like this should do it?

没有经过测试，但这样的事情应该做吗？

foreach($a as $key => $value) {
    $new_arr[$key]=$value->__toString();
}
$a=$new_arr;

回答by YOU

Are you looking for implode?

你在寻找内爆吗？

$array = array('lastname', 'email', 'phone');

$comma_separated = implode(",", $array);

echo $comma_separated; // lastname,email,phone

回答by Pekka

I can't test it right now, but can you check what happens when you implode()such an array? The _toString shouldbe invoked.

我现在不能测试它，但是你能检查一下当你有implode()这样一个数组时会发生什么吗？_toString应该被调用。

回答by Jan Jaso

Alix Axel has the nicest answer. You can also apply anything to the array though with array_map like...

Alix Axel 给出了最好的答案。您也可以使用 array_map 将任何内容应用于数组，例如...

//All your objects to string.
$a = array_map(function($o){return (string)$o;}, $a);
//All your objects to string with exclamation marks!!!
$a = array_map(function($o){return (string)$o."!!!";}, $a);

Enjoy

享受

回答by Martin Bean

Is there any reason why you can't do the following?

有什么理由不能执行以下操作吗？

$a = array(
    (string) $objA,
    (string) $objB,
);