php-grammarAn open source EBNF grammar for PHP.

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PHP 8.5 Production

primary-expression

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primary-expression 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: literalliteralExplore production: array-creation-expressionarray-creation-expressionExplore production: constantconstantExplore production: class-constantclass-constantExplore production: magic-constantmagic-constant"("Explore production: expressionexpression")"Explore production: new-dereferenceablenew-dereferenceable"new"Explore production: class-name-referenceclass-name-referenceExplore production: backtick-stringbacktick-string"isset""("Explore production: isset-variable-listisset-variable-list","")""empty""("Explore production: expressionexpression")""eval""("Explore production: expressionexpression")""exit"Explore production: argument-listargument-list"die"Explore production: argument-listargument-list
Production LiteralBranch: choiceBypass: optionalLoop: repeat
EBNF source
primary-expression =
    literal | array-creation-expression | constant | class-constant | magic-constant
    | "(" , expression , ")" | new-dereferenceable | "new" , class-name-reference
    | backtick-string
    | "isset" , "(" , isset-variable-list , [ "," ] , ")"
    | "empty" , "(" , expression , ")" | "eval" , "(" , expression , ")"
    | "exit" , [ argument-list ] | "die" , [ argument-list ] ;

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literal array-creation-expression constant class-constant magic-constant expression new-dereferenceable class-name-reference backtick-string isset-variable-list argument-list
Referenced by 1
postfix-expression

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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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