sandip posted

closure in PHP ?

used JavaScript closure many time


function closure(a,b){
var a=a;
var b=b;
retrun add(){
     return a+b;
}
}

can we define closure as above in PHP also ? if yes than is closure useful in PHP ?

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sec8
answered Apr 24 '23 00:00

In PHP, closures are anonymous functions that allow you to define a function without giving it a name. They were introduced in PHP 5.3 and have become an essential feature of modern PHP programming.

Closures can access variables in their parent scope, even after the parent function has returned. This feature is known as "closing over" the variables in the parent scope.

Let's see an example of a closure in PHP:


function createCounter() {
  $count = 0;
  return function() use (&$count) {
    $count++;
    return $count;
  };
}

$counter = createCounter();
echo $counter(); // Output: 1
echo $counter(); // Output: 2
echo $counter(); // Output: 3

In this example, the createCounter function returns a closure that increments a counter and returns the updated value each time it is called. The $coun t variable is defined in the parent scope and is passed to the closure using the use keyword.

The $counter variable is assigned the returned closure and can be used to increment the counter and retrieve its value.

Closures are widely used in PHP for callbacks, event handlers, and for creating functions that can be passed as arguments to other functions. They provide a powerful and flexible way to define and use functions in PHP.

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sandip posted

closure in PHP ?

sec8 answered Apr 24 '23 00:00

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sec8
answered Apr 24 '23 00:00