PHP supports the concept of variable functions. This means that if a variable name has parentheses after it, 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 with echo, print, unset(), isset(), empty(), include, require and similar language structures. Your own wrapper function is required to use these structures as variadic functions.
Example #1 Variable function example
<?php function foo () { echo "In foo()<br />\n" ; } function bar ( $arg = '' ) { echo "In bar(); argument was ' $arg '.<br />\n" ; } // 使用 echo 的包装函数 function echoit ( $string ) { echo $string ; } $func = 'foo' ; $func (); // This calls foo() $func = 'bar' ; $func ( 'test' ); // This calls bar() $func = 'echoit' ; $func ( 'test' ); // This calls echoit() ?>
You can also use the syntax of variable function to call the method of an object.
Example #2 Variable method example
<?php 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() ?>
When calling a static method, function calls take precedence over static properties:
Example #3 Variable Method and static property examples
<?php 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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