php-grammarAn open source EBNF grammar for PHP.

Grammar explorer

PHP 8.5 Production

hexadecimal-digit

Read left to right. Select any rule to explore it.

hexadecimal-digit railroad diagramRead left to right. Branches are alternatives, bypasses are optional, and loops repeat. Select a production to explore it. The EBNF and linked references follow below.Explore production: decimal-digitdecimal-digit"a""b""c""d""e""f""A""B""C""D""E""F"
Production LiteralBranch: choiceBypass: optionalLoop: repeat
EBNF source
hexadecimal-digit =
      decimal-digit | "a" | "b" | "c" | "d" | "e" | "f"
    | "A" | "B" | "C" | "D" | "E" | "F" ;

Explore next

decimal-digit
Referenced by 1
hexadecimal-integer-literal

Take it with you

The grammar, in plain text.

For reading, building tools, and exploring PHP.
Free to use under the MIT license.

php.ebnfPHP 8.5 · Canonical EBNF grammar php.mdPHP 8.5 · Grammar & source contract

A shared understanding of PHP.

php-grammar is an open source project documenting PHP syntax in a consistent, tool-independent format. The EBNF describes syntax; the accompanying specification defines lexical rules and contextual constraints.

Explore the project and contribute