Code Inspection: Pass parameter by reference
Configure inspections: Settings | Editor | Inspections
Show intention actions: AltEnter
Reports the arguments in a function/method call that cannot be passed by reference.
Only variables and references returned from functions can be passed by reference. See Passing by Reference (php.net) for details.
Place the caret at the highlighted line and press AltEnter or click
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Click the arrow next to the inspection you want to suppress and select the necessary suppress action.