Description:
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Hi.
I'm studying PHP with your online manual 
https://www.php.net/manual/en/language.generators.syntax.php#control-structures.yield
and it has an example "Example #1 A simple example of yielding values"; 
when I copied and pasted it in my test php script I got a lot of parse errors; I found out later that they were caused by the nbsp; character used in the example code instead of plain spaces. 
I recommend you not to use the nbsp character and use plain space instead, in order to ease with trying the examples in the manual. 
nbsp is not required for proper formatting, plain space is enough, provided that a monospace font is used. 

Test script:
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function gen_one_to_three() {

Expected result:
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1 2 3

Actual result:
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Parse error: syntax error, unexpected 'for' (T_FOR)