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Not Able to Solve Technical Review Error " PHP syntax error: Can't use function return value in w "

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Not Able to Solve Technical Review Error " PHP syntax error: Can't use function return value in w "

I got a technical review report and that is full of " PHP syntax error: Can't use function return value in write context " this error. 

And not able to under stand what is this error is all about. 

Can anyone let me know what is this and why this is showing for a normal function like 

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