php-grammarAn open source EBNF grammar for PHP.

Grammar explorer

PHP 8.5 Production

identifier-part

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

identifier-part 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: identifier-start-characteridentifier-start-characterExplore production: decimal-digitdecimal-digitExplore production: non-ascii-bytenon-ascii-byte
Production LiteralBranch: choiceBypass: optionalLoop: repeat
EBNF source
identifier-part =
      identifier-start-character
    | decimal-digit
    | non-ascii-byte ;

Explore next

identifier-start-character decimal-digit non-ascii-byte
Referenced by 2
identifiername-identifier

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