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<?php foreach (preg_split('/,\s*/', '__halt_compiler,abstract,and,array,as,break,callable,case,catch,class,clone,const,continue,declare,default, die,do,echo,else,elseif,empty,enddeclare,endfor,endforeach,endif,endswitch,endwhile,eval,exit,extends,final, finally,for,foreach,function,global,goto,if,implements,include,include_once,instanceof,insteadof,interface, isset,list,namespace,new,or,print,private,protected,public,require,require_once,return,static,switch,throw, trait,try,unset,use,var,while,xor,yield' ) as $keyword) { try { printf("%20s: ", $keyword); eval("echo $keyword::class;"); } catch (Throwable $t) { echo $t->getMessage(), "\n"; } }

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Output for 8.3.0 - 8.3.11
__halt_compiler: syntax error, unexpected token "__halt_compiler" abstract: syntax error, unexpected token "abstract" and: syntax error, unexpected token "and" array: syntax error, unexpected token "::", expecting "(" as: syntax error, unexpected token "as" break: syntax error, unexpected token "break" callable: syntax error, unexpected token "callable" case: syntax error, unexpected token "case" catch: syntax error, unexpected token "catch" class: syntax error, unexpected token "class" clone: syntax error, unexpected token "::" const: syntax error, unexpected token "const" continue: syntax error, unexpected token "continue" declare: syntax error, unexpected token "declare" default: syntax error, unexpected token "default" die: syntax error, unexpected token "::", expecting "," or ";" do: syntax error, unexpected token "do" echo: syntax error, unexpected token "echo" else: syntax error, unexpected token "else" elseif: syntax error, unexpected token "elseif" empty: syntax error, unexpected token "::", expecting "(" enddeclare: syntax error, unexpected token "enddeclare" endfor: syntax error, unexpected token "endfor" endforeach: syntax error, unexpected token "endforeach" endif: syntax error, unexpected token "endif" endswitch: syntax error, unexpected token "endswitch" endwhile: syntax error, unexpected token "endwhile" eval: syntax error, unexpected token "::", expecting "(" exit: syntax error, unexpected token "::", expecting "," or ";" extends: syntax error, unexpected token "extends" final: syntax error, unexpected token "final" finally: syntax error, unexpected token "finally" for: syntax error, unexpected token "for" foreach: syntax error, unexpected token "foreach" function: syntax error, unexpected token "::", expecting "(" global: syntax error, unexpected token "global" goto: syntax error, unexpected token "goto" if: syntax error, unexpected token "if" implements: syntax error, unexpected token "implements" include: syntax error, unexpected token "::" include_once: syntax error, unexpected token "::" instanceof: syntax error, unexpected token "instanceof" insteadof: syntax error, unexpected token "insteadof" interface: syntax error, unexpected token "interface" isset: syntax error, unexpected token "::", expecting "(" list: syntax error, unexpected token "::", expecting "(" namespace: syntax error, unexpected token "namespace" new: syntax error, unexpected token "::", expecting "class" or: syntax error, unexpected token "or" print: syntax error, unexpected token "::" private: syntax error, unexpected token "private" protected: syntax error, unexpected token "protected" public: syntax error, unexpected token "public" require: syntax error, unexpected token "::" require_once: syntax error, unexpected token "::" return: syntax error, unexpected token "return" static: Cannot use "static" in the global scope switch: syntax error, unexpected token "switch" throw: syntax error, unexpected token "::" trait: syntax error, unexpected token "trait" try: syntax error, unexpected token "try" unset: syntax error, unexpected token "unset" use: syntax error, unexpected token "use" var: syntax error, unexpected token "var" while: syntax error, unexpected token "while" xor: syntax error, unexpected token "xor" yield: syntax error, unexpected token "::", expecting "," or ";"
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23
__halt_compiler: syntax error, unexpected token "__halt_compiler" abstract: syntax error, unexpected token "abstract" and: syntax error, unexpected token "and" array: syntax error, unexpected token "::", expecting "(" as: syntax error, unexpected token "as" break: syntax error, unexpected token "break" callable: syntax error, unexpected token "callable" case: syntax error, unexpected token "case" catch: syntax error, unexpected token "catch" class: syntax error, unexpected token "class" clone: syntax error, unexpected token "::" const: syntax error, unexpected token "const" continue: syntax error, unexpected token "continue" declare: syntax error, unexpected token "declare" default: syntax error, unexpected token "default" die: syntax error, unexpected token "::", expecting "," or ";" do: syntax error, unexpected token "do" echo: syntax error, unexpected token "echo" else: syntax error, unexpected token "else" elseif: syntax error, unexpected token "elseif" empty: syntax error, unexpected token "::", expecting "(" enddeclare: syntax error, unexpected token "enddeclare" endfor: syntax error, unexpected token "endfor" endforeach: syntax error, unexpected token "endforeach" endif: syntax error, unexpected token "endif" endswitch: syntax error, unexpected token "endswitch" endwhile: syntax error, unexpected token "endwhile" eval: syntax error, unexpected token "::", expecting "(" exit: syntax error, unexpected token "::", expecting "," or ";" extends: syntax error, unexpected token "extends" final: syntax error, unexpected token "final" finally: syntax error, unexpected token "finally" for: syntax error, unexpected token "for" foreach: syntax error, unexpected token "foreach" function: syntax error, unexpected token "::", expecting "(" global: syntax error, unexpected token "global" goto: syntax error, unexpected token "goto" if: syntax error, unexpected token "if" implements: syntax error, unexpected token "implements" include: syntax error, unexpected token "::" include_once: syntax error, unexpected token "::" instanceof: syntax error, unexpected token "instanceof" insteadof: syntax error, unexpected token "insteadof" interface: syntax error, unexpected token "interface" isset: syntax error, unexpected token "::", expecting "(" list: syntax error, unexpected token "::", expecting "(" namespace: syntax error, unexpected token "namespace" new: syntax error, unexpected token "::" or: syntax error, unexpected token "or" print: syntax error, unexpected token "::" private: syntax error, unexpected token "private" protected: syntax error, unexpected token "protected" public: syntax error, unexpected token "public" require: syntax error, unexpected token "::" require_once: syntax error, unexpected token "::" return: syntax error, unexpected token "return" static: Cannot use "static" in the global scope switch: syntax error, unexpected token "switch" throw: syntax error, unexpected token "::" trait: syntax error, unexpected token "trait" try: syntax error, unexpected token "try" unset: syntax error, unexpected token "unset" use: syntax error, unexpected token "use" var: syntax error, unexpected token "var" while: syntax error, unexpected token "while" xor: syntax error, unexpected token "xor" yield: syntax error, unexpected token "::", expecting "," or ";"
Output for 7.4.0 - 7.4.33
__halt_compiler: syntax error, unexpected '__halt_compiler' (T_HALT_COMPILER) abstract: syntax error, unexpected 'abstract' (T_ABSTRACT) and: syntax error, unexpected 'and' (T_LOGICAL_AND) array: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' as: syntax error, unexpected 'as' (T_AS) break: syntax error, unexpected 'break' (T_BREAK) callable: syntax error, unexpected 'callable' (T_CALLABLE) case: syntax error, unexpected 'case' (T_CASE) catch: syntax error, unexpected 'catch' (T_CATCH) class: syntax error, unexpected 'class' (T_CLASS) clone: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) const: syntax error, unexpected 'const' (T_CONST) continue: syntax error, unexpected 'continue' (T_CONTINUE) declare: syntax error, unexpected 'declare' (T_DECLARE) default: syntax error, unexpected 'default' (T_DEFAULT) die: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting ';' or ',' do: syntax error, unexpected 'do' (T_DO) echo: syntax error, unexpected 'echo' (T_ECHO) else: syntax error, unexpected 'else' (T_ELSE) elseif: syntax error, unexpected 'elseif' (T_ELSEIF) empty: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' enddeclare: syntax error, unexpected 'enddeclare' (T_ENDDECLARE) endfor: syntax error, unexpected 'endfor' (T_ENDFOR) endforeach: syntax error, unexpected 'endforeach' (T_ENDFOREACH) endif: syntax error, unexpected 'endif' (T_ENDIF) endswitch: syntax error, unexpected 'endswitch' (T_ENDSWITCH) endwhile: syntax error, unexpected 'endwhile' (T_ENDWHILE) eval: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' exit: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting ';' or ',' extends: syntax error, unexpected 'extends' (T_EXTENDS) final: syntax error, unexpected 'final' (T_FINAL) finally: syntax error, unexpected 'finally' (T_FINALLY) for: syntax error, unexpected 'for' (T_FOR) foreach: syntax error, unexpected 'foreach' (T_FOREACH) function: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' global: syntax error, unexpected 'global' (T_GLOBAL) goto: syntax error, unexpected 'goto' (T_GOTO) if: syntax error, unexpected 'if' (T_IF) implements: syntax error, unexpected 'implements' (T_IMPLEMENTS) include: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) include_once: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) instanceof: syntax error, unexpected 'instanceof' (T_INSTANCEOF) insteadof: syntax error, unexpected 'insteadof' (T_INSTEADOF) interface: syntax error, unexpected 'interface' (T_INTERFACE) isset: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' list: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' namespace: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting \\ (T_NS_SEPARATOR) new: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) or: syntax error, unexpected 'or' (T_LOGICAL_OR) print: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) private: syntax error, unexpected 'private' (T_PRIVATE) protected: syntax error, unexpected 'protected' (T_PROTECTED) public: syntax error, unexpected 'public' (T_PUBLIC) require: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) require_once: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) return: syntax error, unexpected 'return' (T_RETURN) static: Cannot use "static" when no class scope is active switch: syntax error, unexpected 'switch' (T_SWITCH) throw: syntax error, unexpected 'throw' (T_THROW) trait: syntax error, unexpected 'trait' (T_TRAIT) try: syntax error, unexpected 'try' (T_TRY) unset: syntax error, unexpected 'unset' (T_UNSET) use: syntax error, unexpected 'use' (T_USE) var: syntax error, unexpected 'var' (T_VAR) while: syntax error, unexpected 'while' (T_WHILE) xor: syntax error, unexpected 'xor' (T_LOGICAL_XOR) yield: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting ';' or ','
Output for 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
__halt_compiler: syntax error, unexpected '__halt_compiler' (T_HALT_COMPILER) abstract: syntax error, unexpected 'abstract' (T_ABSTRACT) and: syntax error, unexpected 'and' (T_LOGICAL_AND) array: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' as: syntax error, unexpected 'as' (T_AS) break: syntax error, unexpected 'break' (T_BREAK) callable: syntax error, unexpected 'callable' (T_CALLABLE) case: syntax error, unexpected 'case' (T_CASE) catch: syntax error, unexpected 'catch' (T_CATCH) class: syntax error, unexpected 'class' (T_CLASS) clone: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) const: syntax error, unexpected 'const' (T_CONST) continue: syntax error, unexpected 'continue' (T_CONTINUE) declare: syntax error, unexpected 'declare' (T_DECLARE) default: syntax error, unexpected 'default' (T_DEFAULT) die: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting ',' or ';' do: syntax error, unexpected 'do' (T_DO) echo: syntax error, unexpected 'echo' (T_ECHO) else: syntax error, unexpected 'else' (T_ELSE) elseif: syntax error, unexpected 'elseif' (T_ELSEIF) empty: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' enddeclare: syntax error, unexpected 'enddeclare' (T_ENDDECLARE) endfor: syntax error, unexpected 'endfor' (T_ENDFOR) endforeach: syntax error, unexpected 'endforeach' (T_ENDFOREACH) endif: syntax error, unexpected 'endif' (T_ENDIF) endswitch: syntax error, unexpected 'endswitch' (T_ENDSWITCH) endwhile: syntax error, unexpected 'endwhile' (T_ENDWHILE) eval: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' exit: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting ',' or ';' extends: syntax error, unexpected 'extends' (T_EXTENDS) final: syntax error, unexpected 'final' (T_FINAL) finally: syntax error, unexpected 'finally' (T_FINALLY) for: syntax error, unexpected 'for' (T_FOR) foreach: syntax error, unexpected 'foreach' (T_FOREACH) function: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' global: syntax error, unexpected 'global' (T_GLOBAL) goto: syntax error, unexpected 'goto' (T_GOTO) if: syntax error, unexpected 'if' (T_IF) implements: syntax error, unexpected 'implements' (T_IMPLEMENTS) include: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) include_once: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) instanceof: syntax error, unexpected 'instanceof' (T_INSTANCEOF) insteadof: syntax error, unexpected 'insteadof' (T_INSTEADOF) interface: syntax error, unexpected 'interface' (T_INTERFACE) isset: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' list: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting '(' namespace: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting \\ (T_NS_SEPARATOR) new: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) or: syntax error, unexpected 'or' (T_LOGICAL_OR) print: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) private: syntax error, unexpected 'private' (T_PRIVATE) protected: syntax error, unexpected 'protected' (T_PROTECTED) public: syntax error, unexpected 'public' (T_PUBLIC) require: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) require_once: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM) return: syntax error, unexpected 'return' (T_RETURN) static: Cannot use "static" when no class scope is active switch: syntax error, unexpected 'switch' (T_SWITCH) throw: syntax error, unexpected 'throw' (T_THROW) trait: syntax error, unexpected 'trait' (T_TRAIT) try: syntax error, unexpected 'try' (T_TRY) unset: syntax error, unexpected 'unset' (T_UNSET) use: syntax error, unexpected 'use' (T_USE) var: syntax error, unexpected 'var' (T_VAR) while: syntax error, unexpected 'while' (T_WHILE) xor: syntax error, unexpected 'xor' (T_LOGICAL_XOR) yield: syntax error, unexpected '::' (T_PAAMAYIM_NEKUDOTAYIM), expecting ',' or ';'
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