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PHP code:
class B // .... ÂÔ

class A extents B
{
function __construct()
{
if( $a > 1 ) //ÕâÀïÈçºÎÌø³ö£¬ »òÖÕÖ¹Ö´ÐУ¬ ²»ÄÜÓÃexit
}

function a()
{
echo 'this is a.';
}

function b()
{
echo 'this is b.';
}
}


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$test = new A;
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return ;

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PHP code:

<?php
class A
{
function __construct($what = 'aa')
{
($what != 'aa') ? $this->bb() : $this->aa();//¶þÑ¡Ò»Ö®Ò»
method_exists($this,$what) ? $this->$what() : print('no A::'.$what.'()!');//¶þÑ¡Ò»Ö®¶þ
}

function aa()
{
echo 'this is a.';