Only variables can be passed by reference - Externals
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Only variables should be passed by reference in D:\xamp\htdocs\php \QB\src\Core\Http\Serialization\XmlObjectSerializer.php on line 54 · Issue #180 · intuit/QuickBooks-V3-PHP-SDK · GitHub
PHP 7.0+ - Only variables should be passed by reference · Issue #2550 · squizlabs/PHP_CodeSniffer · GitHub
PHP- PDO Only variables should be passed by reference - Stack Overflow
PHP 7.0+ - Only variables should be passed by reference · Issue #2550 · squizlabs/PHP_CodeSniffer · GitHub
PHP notice: Only variables should be passed by reference | WordPress.org