php foreach

In PHP development, we often iterate an array and modify the values ​​of its elements. If we have experience in other languages, we are likely to make mistakes here.

Take java as an example, because I am still relatively familiar with java. In java, we iterate an array and modify its value. We will use the following method:

	<span>	</span>for(Object item : objectArray){
		<span>	</span>item.setAttribute('value');
	<span>	</span>}

The above code is no problem, everything is as we expected Come. Until I got to PHP and was working on a small project these days, I found that using a method similar to the above to modify the value of an element did not work! The code used is as follows:

		foreach($arrays as $item){
			$item->name = 'value';	
		}
		echo $arrays[0]->name;

I found that the output was the one before modification!

After some debugging, I finally guessed whether the above code passed a value instead of a reference. So I went to the official website to check the documentation and found that this was actually the case, so I modified the code to look like this:

		foreach($arrays as &$item){
			$item->name = 'value';	
		}
		echo $arrays[0]->name;

Or like this:

		foreach($arrays as $key=>$item){
			$arrays[$key]->name = 'value';	
		}
		echo $arrays[0]->name;

The results of both methods are OK. Therefore, I feel that I should read more official documents. At first, I just went through it in general and started working on the project without really reading it thoroughly.

Reference materials:

PHP official website’s explanation of foreach: http://php.net/manual/en/control-structures.foreach.php

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The above introduces php foreach, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.