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NullableTypeDeclarationStandard.xml
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<documentation title="Nullable Type Declarations Functions"> <standard> <![CDATA[ In nullable type declarations there MUST NOT be a space between the question mark and the type. ]]> </standard> <code_comparison> <code title="Valid: no whitespace used."> <![CDATA[ public function functionName( ?string $arg1, ?int $arg2 ): ?string { } ]]> </code> <code title="Invalid: superfluous whitespace used."> <![CDATA[ public function functionName( ? string $arg1, ? int $arg2 ): ? string { } ]]> </code> </code_comparison> <code_comparison> <code title="Valid: no unexpected characters."> <![CDATA[ public function foo(?int $arg): ?string { } ]]> </code> <code title="Invalid: unexpected characters used."> <![CDATA[ public function bar(? /* comment */ int $arg): ? // nullable for a reason string { } ]]> </code> </code_comparison> </documentation>