phpfunctionglobal-variablespass-by-referenceanonymous

Modify a globally scoped variable inside of an anonymous function

I was playing around with anonymous functions in PHP and realized that they don't seem to reach variables outside of them. Is there any way to get around this problem?

Example:

$variable = "nothing";

functionName($someArgument, function() {
  $variable = "something";
});

echo $variable;  //output: "nothing"

This will output "nothing". Is there any way that the anonymous function can access the $variable?

Solution

  • Yes, use a closure:

    functionName($someArgument, function() use(&$variable) {
  $variable = "something";
});

    Note that in order for you to be able to modify $variable and retrieve the modified value outside of the scope of the anonymous function, it must be referenced in the closure using &.