PHP in_array对象比较? [英] PHP in_array object comparing?

问题描述

in_array函数可以比较对象吗?

Can the in_array function compare objects?

例如，我有一个对象数组，我想将它们分别添加到另一个数组中.是否可以像这样检查是否已添加对象:

For example, I have an array of objects and I want to add them distinctly to another array. Is it possible to check if an object has already been added like so:

in_array($distinct, $object);

还是还有其他方法?

推荐答案

The in_array function cannot compare objects.

您应该从对象中创建唯一的键/值对，并且在将新对象插入最终数组时只需要比较这些键即可.

You should create unique key-value pairs from your objects and only need to compare those keys when inserting a new object into your final array.

假设每个对象都有唯一的id属性，可能的解决方案是:

Assuming that each object has an unique id property, a possible solution would be:

$unique_objects = array();

// $data represents your object collection
foreach ($data as $item) {
    if (!array_key_exists($item->id, $unique_objects)) {
        $unique_objects[$item->id] = $obj;
    }
}

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