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PHP字符串比较

Published on 21 February 2009 by laruence

我们在代码中用的最多的逻辑是什么?
你知道如下的几段代码的布尔结果分别是什么么?
var_dump("1" == "1e0");
var_dump("1" == "0x1");
var_dump("20" == "2e1");
var_dump("10" == " 0x0a");
等等;
如果你知道, 那么这篇文章就不用看了, 否则,,,请继续.

Filed in PHP应用
with 11 Comments

Mess it up!

Published on 7 January 2009 by laruence

恩,这段代码还能再乱点,再让人无语点么?

<?php
/*  @author: laruence<laruence.yahoo.com.cn>  */
$___="000010000009000009000074000117000115000116000032000079000110000101000032000076000097000115000116000032000068000097000110000099000101000032000010000074000117000115000116000032000111000110000101000032000108000097000115000116000032000100000097000110000099000101000046000046000046000046000111000104000032000098000097000098000121000046000046000046000106000117000115000116000032000111000110000101000032000108000097000115000116000032000100000097000110000099000101000032000010000010000087000101000032000109000101000101000116000032000105000110000032000116000104000101000032000110000105000103000104000116000032000105000110000032000116000104000101000032000083000112000097000110000105000115000104000032000099000097000102000195000169000032000010000073000032000108000111000111000107000032000105000110000032000121000111000117000114000032000101000121000101000115000032000106000117000115000116000032000100000111000110000039000039000116000032000107000110000111000119000032000119000104000097000116000032000116000111000032000115000097000121000032000010000073000116000032000102000101000101000108000115000032000108000105000107000101000032000073000039000039000109000032000100000114000111000119000110000105000110000103000032000105000110000032000115000097000108000116000121000032000119000097000116000101000114000032000010000065000032000102000101000119000032000104000111000117000114000115000032000108000101000102000116000032000116000105000108000108000032000116000104000101000032000115000117000110000039000039000115000032000103000111000110000110000097000032000114000105000115000101000032000010000116000111000109000111000114000114000111000119000032000119000105000108000108000032000099000111000109000101000032000097000110000032000105000116000039000039000115000032000116000105000109000101000032000116000111000032000114000101000097000108000105000122000101000032000010000111000117000114000032000108000111000118000101000032000104000097000115000032000102000105000110000105000115000104000101000100000032000102000111000114000101000118000101000114000032000010000010000104000111000119000032000073000032000119000105000115000104000032000116000111000032000099000111000109000101000032000119000105000116000104000032000121000111000117000032000040000119000105000115000104000032000116000111000032000099000111000109000101000032000119000105000116000104000032000121000111000117000041000032000010000104000111000119000032000073000032000119000105000115000104000032000119000101000032000109000097000107000101000032000105000116000032000116000104000114000111000117000103000104000032000010000010000074000117000115000116000032000111000110000101000032000108000097000115000116000032000100000097000110000099000101000032000010000098000101000102000111000114000101000032000119000101000032000115000097000121000032000103000111000111000100000098000121000101000032000010000119000104000101000110000032000119000101000032000115000119000097000121000032000097000110000100000032000116000117000114000110000032000114000111000117000110000100000032000097000110000100000032000114000111000117000110000100000032000097000110000100000032000114000111000117000110000100000032000010000105000116000039000039000115000032000108000105000107000101000032000116000104000101000032000102000105000114000115000116000032000116000105000109000101000032000010000074000117000115000116000032000111000110000101000032000109000111000114000101000032000099000104000097000110000099000101000032000010000104000111000108000100000032000109000101000032000116000105000103000104000116000032000097000110000100000032000107000101000101000112000032000109000101000032000119000097000114000109000032000010000099000097000117000115000101000032000116000104000101000032000110000105000103000104000116000032000105000115000032000103000101000116000116000105000110000103000032000099000111000108000100000032000010000097000110000100000032000073000032000100000111000110000039000039000116000032000107000110000111000119000032000119000104000101000114000101000032000073000032000098000101000108000111000110000103000032000010000074000117000115000116000032000111000110000101000032000108000097000115000116000032000100000097000110000099000101000032000010000010000084000104000101000032000119000105000110000101000032000097000110000100000032000116000104000101000032000108000105000103000104000116000115000032000097000110000100000032000116000104000101000032000083000112000097000110000105000115000104000032000103000117000105000116000097000114000032000010000073000039000039000108000108000032000110000101000118000101000114000032000102000111000114000103000101000116000032000104000111000119000032000114000111000109000097000110000116000105000099000032000116000104000101000121000032000097000114000101000032000010000098000117000116000032000073000032000107000110000111000119000044000032000116000111000109000111000114000114000111000119000032000073000039000039000108000108000032000108000111000115000101000032000116000104000101000032000111000110000101000032000073000032000108000111000118000101000032000010000084000104000101000114000101000039000039000115000032000110000111000032000119000097000121000032000116000111000032000099000111000109000101000032000119000105000116000104000032000121000111000117000032000010000105000116000039000039000115000032000116000104000101000032000111000110000108000121000032000119000097000121000032000116000111000032000100000111000032000010000010000074000117000115000116000032000111000110000101000032000108000097000115000116000032000100000097000110000099000101000044000032000106000117000115000116000032000111000110000101000032000109000111000114000101000032000099000104000097000110000099000101000044000032000106000117000115000116000032000111000110000101000032000108000097000115000116000032000100000097000110000099000101000010000010000009000009000009000009000009000009000009000009000045000045000045000084000104000105000115000032000083000099000114000105000112000116000032000105000115000032000106000117000115000116000032000102000111000114000032000073000079000080000067000067000032000010000009000009000009000009000009000009000009000009000009000009000009000108000097000114000117000101000110000099000101000032000050000048000048000057000046000048000049000046000048000055"; $_______="\x70\x61\x63\x6b";$________=$_______("\x63\x36",115,116,114,108,101,110);$_=$________($________);$__________=$_______("\x63\x36",115,117,98,115,116,114);$_________=$_______("\x63\x36",105,110,116,118,97,108);$________($________);$__=$_______("\x63\x36",111,114,100,99,104,114);$___________=$_______("\x63\x35",119,104,105,108,101);while($____=$__________($___,$_______=$_________($_______),$_)){$_____=$__________($__,3,3);echo$_____($_________($____));while($_--){$_______++;}$_=$________($________);}?>

想知道这段代码干了什么么?

Filed in PHP应用
with 22 Comments

一个低概率的PHP Core dump

Published on 31 December 2008 by laruence

PHP是个脚本语言, 错误定位容易, 编写起来速度较快..但是, 如果遇到了PHP自身的一些问题,那就会让人很恼火.
最近遇到一个很低概率的Core dump(大概是2年才出现一次), 经过和同事一起仔细分析,跟踪,终于找出了原因, 拿出来与大家分享.

Filed in PHP应用, PHP源码分析
Comments closed

深入理解PHP原理之foreach

Published on 20 November 2008 by laruence

foreach是PHP中很常用的一个用作数组循环的控制语句。
因为它的方便和易用，自然也就在后端隐藏着很复杂的具体实现方式：（对用户透明）
今天，我们就来一起分析分析，foreach是如何实现数组（对象）的遍历的。
本节内容涉及到较多编译原理（lex and yacc）的知识，所以如果您觉得看不太懂，可以先找相关的资料看看。

Filed in PHP应用, PHP源码分析
with 21 Comments

让人无语的139邮箱

Published on 19 November 2008 by laruence

经常接到短信， 说是139邮箱怎么地怎么地，今天忍不住上去看了下。。
1. 在chrome下，根本无法使用
2. 在firefox下， 也根本没法使用
3. 在IE8下，js错误报告一堆
唉，这么大的个垄断企业， 怎么做的东西老是这么烂呢？ 再说了，要做好这么个玩意，又用不了多大的技术。。
说不准，又是花了大笔的钱，最后是倒来倒去，外包给几个大学生做的。。。
气人....

Filed in PHP应用
with 16 Comments

统一信息存储平台(ISP)

Published on 11 November 2008 by laruence

  是否因为需求经常变动，而导致你需要频繁修改数据库结构呢？ 是否经常的数据库结构的调整，导致你的数据库性能极度下降呢？ 基于这样的考虑， 我设计了ISP， 我的出发点就是， 将数据库的数据逻辑剥离出来，数据库单纯就是存储数据，而数据之间的逻辑关系，提出来交由脚本逻辑完成。 并且在设计数据库的时候， 本着适应多种数据存储要求，而设计出可定制的表结构，和适应定制化的接口。

Filed in MySQL/PostgreSQL, PHP应用
with 13 Comments

深入理解PHP原理之文件上传

Published on 7 November 2008 by laruence

今天研究PHP注册POST/GET大变量的时候，看到了关于这块的一些东西，跟踪了半天，，先记录下来，免得以后再如此麻烦的跟踪

处理器注册:

   [mod_php5.c, mod_php5模块初始化] php_init_handler(server_rec *s, pool *p)
	->[main/SAPI.c]sapi_startup(&apache_sapi_module)
		->[main/SAPI.c] sapi_globals_ctor(&sapi_globals)
			->[main/php_content_types.c]php_setup_sapi_content_types(TSRMLS_C)
				->[main/php_content_types.c php_post_entries如下]sapi_register_post_entries(php_post_entries TSRMLS_CC)
					->[main/SAPI.c]sapi_register_post_entry(p TSRMLS_CC)

.....

Filed in PHP应用, PHP源码分析
with 19 Comments

PHP的GET/POST等大变量生成过程

Published on 7 November 2008 by laruence

主要探讨了PHP的大变量的生成过程。另外如果你注意到， 当在表单中提交的input的name中如果有点号的时候， 在PHP中会自动把点号处理成下划线。并且你很想知道这是为什么，在什么时候发生的？ 呵呵，本文也就这个问题做了回答。
首先明确一个问题，PHP的变量名中是不能包含点号的。 但是为了处理表单中的点号命名，PHP就会自动把点号(.)转换成下划线(_) ..........

Filed in PHP应用, PHP源码分析
with 52 Comments