PHP - foreach，使用方法返回值或变量[重复]

Question

This question already has an answer here:

• Using function call in foreach loop 2 answers

Using the following 2 examples:

foreach($this->fooBar() as $foo => $bar) {
     // do something 
}

versus

$fooBar = $this->fooBar();
foreach($fooBar as $foo => $bar) {
     // do something 
}

Are there any implications of using either over the other or should readability be the only consideration between the two?

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Answer 1

It’s basically the same.

In your first example, the result of $this->fooBar() is stored internally.

The second example only makes sense if you also want to use $fooBar outside the foreach loop.

To learn more about internals of PHP’s foreach and why you shouldn’t care too much about the difference between your examples (and similar other ones), have a look at the following article:

https://nikic.github.io/2011/11/11/PHP-Internals-When-does-foreach-copy.html