difference between function and &function

 

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  • What does it mean to start a PHP function with an ampersand? 2 answers
  • Reference — What does this symbol mean in PHP? 18 answers

    • If you put an ampersand before your function name, the function will return a reference to a variable instead of the value.

    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.

    From the PHP Manual on Returning References.

    The difference is how the return value is returned: Without & the return value is returned by value and with & the return value is returned by reference.

    The latter implies that you need to use a variable in the return statement as you can only reference variables.

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