PHP references (ampersand)

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What does it mean to start a PHP function with an ampersand? 2 answers

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Returning by reference is useful when you want to use a function to find to which variable a reference should be bound. Do not use return-by-reference to increase performance. The engine will automatically optimize this on its own. Only return references when you have a valid technical reason to do so. To return references, use this syntax:

From the PHP manual Returning References

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