What does "array_expression" mean in php?

Question

http://php.net/manual/en/control-structures.foreach.php

Trying to better understand the foreach loop. In the documentation above it states "The first form loops over the array given by array_expression."

What in the world is an array_expression?

Answer 1

An array_expression is any expression that results in an array. So these are expressions that are not arrays themselves but result in an array when evaluated:

foreach(range(1, 5) as $val){}

Or:

foreach($array = range(1, 5) as $val){}

Or:

class Test {
    public static function do_it() {
        return range(1, 5);
    }
}

foreach(Test::do_it() as $val){}