How does the substr function of PHP fully simulate the right function of ASP?

PHP's substr function fully simulates ASP's right function. some people say that substr can completely replace ASP's right function right & nbsp; (x) substr ($ str,-x); & nbsp; however, if x0 is used, it cannot be replaced at all. Is there any way to replace substr with substr when x0? How does the substr function of PHP fully simulate the ASP right function?
Some people say that substr can completely replace ASP's right function
// Right (x)
Substr ($ str,-x );

However, if x = 0, it cannot be replaced at all. Is there any way to replace it with substr when x = 0?

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------ Solution --------------------
If the offset is 0, an empty string is returned.

Function right ($ s, $ n ){
Return $ n? Substr ($ s,-$ n ):'';
}