Doc #80502 [Com]: Comparison of empty string to 0

Edit report at https://bugs.php.net/bug.php?id=80502&edit=1 ID: 80502 Comment by: kimia dot saladdmo9881 at gmail dot com Reported by: craig at craigfrancis dot co dot uk Summary: Comparison of empty string to 0 Status: Verified Type: Documentation Problem Package: *General Issues Operating System: N/A PHP Version: 8.0.0 Block user comment: N Private report: N New Comment: That was so great. (https://www.fmc4me.net/)github.com Previous Comments: ------------------------------------------------------------------------ [2022-11-04 02:46:31] php dot net at sameprecision dot org Why not stick with the most prolific scripting language on earth, javascript? 0 == "" ------------------------------------------------------------------------ [2022-11-04 02:25:50] php dot net at sameprecision dot org Indeed this is causing problems and breaks compatibility with javascript where 0 == "". With PHP 8, 0 != "". What RFC is being referenced with this? Why would coercion to string "0" make sense here to have "0" != "" instead of false == false or 0 == 0? ------------------------------------------------------------------------ [2020-12-10 14:21:19] craig at craigfrancis dot co dot uk https://www.php.net/manual/en/language.operators.comparison.php Operand 1: string, resource, int or float Operand 2: string, resource, int or float Result: Translate strings and resources to numbers, usual math I have a horrible feeling this change is going to cause issues, as PHP is typically working with user input from web forms, where the GET/POST values provided are strings, same with many other sources (e.g. fgetcsv). ------------------------------------------------------------------------ [2020-12-10 12:49:08] cmb@php.net Yes, that is indeed a consequence of that RFC. Since the empty string is not a well-formed numeric string, a string comparison is done, and the empty string is less than any other string. The migration guide should not only mention == comparision, but the other affected operations as well. And of course the respective documentation in the manual proper needs to be updated. ------------------------------------------------------------------------ [2020-12-10 12:27:28] craig at craigfrancis dot co dot uk And the same with ('' == 0)... PHP 7 this would be true, PHP 8 it's false. While I appreciate that's supposed to be false with ('' === 0), the double equals comparison operator is supposed to be equal "after type juggling". ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=80502 -- Edit this bug report at https://bugs.php.net/bug.php?id=80502&edit=1