Grammar explorer

PHP 8.5 Production

label

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

label 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
Production LiteralBranch: choiceBypass: optionalLoop: repeat
EBNF source
label =
    identifier ;

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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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