Detailed explanation of how to use variable functions in PHP

This article mainly introduces relevant information about the detailed examples of variable functions in PHP. I hope this article can help everyone understand and master variable functions. Friends in need can refer to it

Detailed explanation of examples of variable functions in php

##PHP supports the concept of variadic functions. This means that if there are parentheses after a variable name, PHP will look for a function with the same name as the variable's value and try to execute it. Variable functions can be used to implement some purposes including callback functions and function tables. #########Variable functions cannot be used for echo, print, unset(), isset(), empty(), include, require and similar language constructs. Your own wrapper function is required to use these structures as variadic functions. ###############

class Foo
{
  function Variable()
  {
    $name = 'Bar';
    $this->$name(); // This calls the Bar() method
  }
 
  function Bar()
  {
    echo "This is Bar";
  }
}
 
$foo = new Foo();
$funcname = "Variable";
$foo->$funcname();  // This calls $foo->Variable()
 
class Foo
{
  static $variable = 'static property';
  static function Variable()
  {
    echo 'Method Variable called';
  }
}
 
echo Foo::$variable; // This prints 'static property'. It does need a $variable in this scope.
$variable = "Variable";
Foo::$variable(); // This calls $foo->Variable() reading $variable in this scope.

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