Re: a question on a PayPal's ReflectionUtil (Was: Re: a question on)

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On Friday, June 3, 2022 at 8:10:54 AM UTC+2, J.O. Aho wrote:
> On 02/06/2022 22.32, Meredith Montgomery wrote: 
> > Sorry about the incomplete subject. I'm fixing that. I think I also 
> > understood a bit more about the code I'm asking, so I'm going to add an 
> > addendum. Sorry about this small mess. 
> > 
> > Meredith Montgomery <[email protected]> writes: 
> > 
> >> The file 
> >> 
> >> PayPal/Common/ReflectionUtil.php 
> >> 
> >> --- whose content I show entirely below --- seems to be a class with 
> >> only static methods and static properties. Now, check the procedure 
> >> 
> >> public static function propertyAnnotations($class, $propertyName) 
> >> 
> >> It contains the chunk 
> >> 
> >> if (!($refl =& self::$propertiesRefl[$class][$propertyName])) { 
> >> $getter = self::getter($class, $propertyName); 
> >> $refl = new \ReflectionMethod($class, $getter); 
> >> self::$propertiesRefl[$class][$propertyName] = $refl; 
> >> } 
> >> 
> >> So $refl is instantiated and it is stored in 
> >> 
> >> self::$propertiesRefl[$class][$propertyName] 
> >> 
> >> which is a private static array. This means it cannot be acessed from 
> >> the ``outside''. Also, no other chunk in this class uses 
> >> $propertiesRefl. 
> >> 
> >> Question. Why are they storing $refl if nobody uses it all, not even 
> >> the very class that defines it? 
> > 
> > Actually, it clearly does use $refl. It's used right at the first line 
> > in the chunk above. It is set merely so the if-inner-code is only 
> > executed once in its lifetime. Why? Can you just clarify to me what's 
> > going on this class? I'm not understanding it too clearly. Thank you!
> Yes, the inner code in this section will be called once for each 
> combination of "class" and "propertyName". 
> The function will return a array of annotations (read a bit about it 
> here: https://www.educba.com/php-annotations ) 
> 
> It's most likely used to setup correct check for input values client 
> side and maybe even for post value validation. 
> 
> -- 
> 
> //Aho