php-grammarAn open source EBNF grammar for PHP.

Grammar explorer

PHP 8.5 Production

declare-directive

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declare-directive 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: identifieridentifier"="Explore production: constant-expressionconstant-expression
Production LiteralBranch: choiceBypass: optionalLoop: repeat
EBNF source
declare-directive =
    identifier , "=" , constant-expression ;

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identifier constant-expression
Referenced by 1
declare-directive-list

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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.

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