php – 函数和&函数之间的区别

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function fun1();
function &fun1();

这些有什么区别？

解决方法:

如果在函数名前加上&符号,函数将返回对变量的引用而不是值.

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.

从PHP Manual on Returning References.