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a.php
class A
{
public function __construct()
{
echo "hello world!";
}

page.php
require("a.php");
$a = new A(); 
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page.php
function __autoload($classname)
{
$class_file = strtolower($classname).".php";
if (file_exists($class_file)){
require_once($class_file);
}
}
$a = new A(); 
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bool spl_autoload_register ( [callback $autoload_function] ) 
page.php
function my_own_loader($classname)
{
$class_file = strtolower($classname).".php";
if (file_exists($class_file)){
require_once($class_file);
}
}
spl_autoload_register("my_own_loader");
$a = new A(); 
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class Loader
{
public static function my_own_loader($classname)
{
$class_file = strtolower($classname).".php";
if (file_exists($class_file)){
require_once($class_file);
}
}
}
// ͨ¹ýÊý×éµÄÐÎʽ´«µÝÀàºÍ·½·¨µÄÃû³Æ
spl_autoload_register(array("my_own_loader","Loader"));
$a = new A(); 


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<?php
$word = new com('word.application') or die('ÎÞ·¨´ò¿ªword');
$word->Visiable = false;
$doc_file = '/path/to/doc';
$word->Open($doc_file);
$text = ' ......

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¡¡¡¡´æÖÁ/home/tmpĿ¼
¡¡¡¡ÃüÁîÁÐ±í£º¡¡
¡¡¡¡cd /home/tmp
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php ÖеÄÅÐ¶Ï ×ܽá

<?php
/* Åжϳ£Á¿ÊÇ·ñ´æÔÚ*/
if (defined('MYCONSTANT')) {
echo MYCONSTANT;
}
//ÅжϱäÁ¿ÊÇ·ñ´æÔÚ
if (isset($myvar)) {
echo "´æÔÚ±äÁ¿$myvar.";
}
//ÅжϺ¯ÊýÊÇ·ñ´æÔÚ
if (function_exists('imap_open')) {
echo "´æÔÚº¯Êýimag_open\n";
} else {
echo "º¯Êýimag_open²»´æÔÚ\n";
}
//ÅжÏÀàÊÇ·ñ ......

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