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深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...异常的 gate 应该设置为 3 级，使得用户程序能够使用断点调试程序。
系统调用：系统调用是 OS 提供给用户访问 OS 服务的接口，因此 gate 必须设置为 3 级。
系统调用在每个 OS 实现上可能是不同的，#BP 异常必定是 vector 3，因...
MySQL OPTIMIZE all tables?
...ZE TABLE command which can be used to reclaim unused space in a MySQL install. Is there a way (built-in command or common stored procedure) to run this optimization for every table in the database and/or server install, or is this something you'd have to script up yourself?
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What is an .inc and why use it?
...nvention.
It does have a possible disadvantage which is that servers normally are not configured to parse .inc files as php, so if the file sits in your web root and your server is configured in the default way, a user could view your php source code in the .inc file by visiting the URL directly.
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Email validation using jQuery
...ming more common this regex may need modifying .systems and .poker etc are all valid TLDs now but would fail the regex check
– Liath
Sep 5 '14 at 7:35
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What does '
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It's a shorthand for this:
<?php echo $a; ?>
They're called short tags; see example #2 in the documentation.
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Difference between if () { } and if () : endif;
... @alex It will work with curly brackets as well, but at least personally I find this way kind of clearer in things like this. Cause they you know that it is the end of an if, and not the end of a loop of some sort or something else. Think you have endfor and endwhile or something similar too....
diff to output only the file names
..."29b". Use instead: rsync -ric --dry-run old/ new/ where the "-i" argument allows to obtain the file list directly via rsync -ric --dry-run old/ new/ | cut -d" " -f 2
– iolsmit
Mar 24 '15 at 17:15
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What is the difference between single-quoted and double-quoted strings in PHP?
...uotes in this syntax.
Nowdoc (since PHP 5.3.0) string syntax works essentially like single quoted strings. The difference is that not even single quotes or backslashes have to be escaped. A nowdoc is identified with the same <<< sequence used for heredocs, but the identifier which follows ...
MySQL check if a table exists without throwing an exception
...is the best way to check if a table exists in MySQL (preferably via PDO in PHP) without throwing an exception. I do not feel like parsing the results of "SHOW TABLES LIKE" et cetera. There must be some sort of boolean query?
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Where is PHP.ini in Mac OS X Lion? Thought it was in /usr/local/php5/lib
...me PHP right on my Mac, uncommented httpd.conf, activated web sharing, installed MySQL etc.
I can't seem to find my PHP files, most importantly, PHP.ini.
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