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However:Īrrow functions support the same features as anonymous functions, except that using variables from the parent scope is always automatic.

Since PHP 7.4 you can find arrow functions which also come in the static/non-static flavours. In PHP 5.3 $this was not automatically bound when defined within a class (intentionally) and has been changed with PHP 5.4 and it is since then $this is automatically bound for the (non-static) anonymous function. So unless you need $this within the function, you can safely use the static variant over the non-static one.Īnonymous functions have been introduced in PHP 5.3, both with and without the static keyword. The reason why you get the suggestion within the IDE is that static anonymous functions give you a slightly better performance over the non-static variant. So an actual difference is that you don't have $this bound / available within the anonymous function when it is static. These are introduced as following in the documentation:īecause static methods are callable without an instance of the object created, the pseudo-variable $this is not available inside methods declared as static. If you compare that with the explanation of the static keyword in the context of class methods, this might make the relation more clear. Objects may also not be bound to them at runtime. This prevents them from having the current class automatically bound to them. You're referring to Static Anonymous Functions which are introduced as following in the documentation:Īnonymous functions may be declared statically.