关于php 可变函数的一些示例

<?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()
?>

<?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()

?>

<?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.

?>