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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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PHP code:

<?php
class A
{
function __construct($what = 'aa')
{
($what != 'aa') ? $this->bb() : $this->aa();//¶þѡһ֮һ
method_exists($this,$what) ? $this->$what() : print('no A::'.$what.'()!');//¶þѡһ֮¶þ
}

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


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{
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PHP code:

$date = '2009-12-25';
$ptn = '/([\d]{4})[- \/](0?[\d]|1[0-2])[-\/ ](0?[\d]|[1-2][\d]|3[0-1])/';
if (preg_match($ptn,$date,$out))
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