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When graphing HRULE items, 'Only Variables should be passed by reference' error may be seen · Issue #2724 · Cacti/cacti · GitHub
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PHP: Only variables should be passed by reference · Issue #2409 · protocolbuffers/protobuf · GitHub
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PHP 7.0+ - Only variables should be passed by reference · Issue #2550 · squizlabs/PHP_CodeSniffer · GitHub
