PHP: Using globally defined closure in a class method

Question

I have a closure that is a global variable and I would like to run it in a class I made. However, when I try the following code, I get the error, Exception: Call to undefined method TestClass::globalFunction().

Here is what I'm trying:

$globalFunction = function($var){
    echo "works $var";
};

class TestClass{
    private $globalFunction;
    function __construct(){
        $this->globalFunction = $GLOBALS['globalFunction'];
    }
    function testFunc(){
        $this->globalFunction('a');
    }
}
$arr = new TestClass();
$arr->testFunc();

It's not really related to it being global. Only problem is the syntax of calling it. — Don't Panic, Feb 07 '20 at 00:38
Have you considered using a trait for this? It seems like it might be a good fit. — Don't Panic, Feb 07 '20 at 00:41
I hadn't seen traits before. That is an interesting option, certainly. — JVE999, Feb 07 '20 at 00:57

Nick · Accepted Answer · 2020-02-07T00:55:54.063

0

Because $this->globalfunction is a variable, not a method, you need to wrap it in parentheses to force PHP to evaluate $this->globalfunction before attempting to call it as a function i.e.

function testFunc(){
    ($this->globalFunction)('a');
}

Output:

works a

Demo on 3v4l.org

edited Feb 07 '20 at 00:55

answered Feb 07 '20 at 00:20

Nick

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PHP: Using globally defined closure in a class method

1 Answers1