[PHP] Plugin systems
I'm looking to build a plugin system for my web application. I'm
going to need to handle multiple types of plugin. I know that many of
them exist already, but I'm wanting something that's very object-
clean and PHP5-aware. I was thinking about using multiple interface
implementations, so that I could have a plugin that provides a
particular kind of database access, provides a user interface for
admin purposes, and a simple display unit perhaps for connection
status. In this case I'd define a class like:
class mynewplugin extends pluginbase implements database, admin,
display {
//...
}
I would then be able to introspect (using class_implements etc) to
find, for example, all plugins that implement database access. I
could easily add more plugin types by adding more interface types.
The overall benefit being that all kind of plugin are handled through
a single mechanism.
Does this sound like a solid structure and mechanism?
Marcus
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Re: [PHP] php + cvs
On 31 May 2005, at 09:58, Jochem Maas wrote: Also I hear lots of good things about subversion (SVN), which is a newer alternative for version control - some even say its better. I can definitely vouch for Subversion. I'm using it for all my PHP stuff. I'd not used cvs a great deal, but I'd always found it awkward and svn is certainly easier. The home page is here: http://subversion.tigris.org/ The documentation (an online O'Reilly book) is excellent. It's pretty easy to learn (shares most basic commands with cvs), and there are many helper apps to work with it, not least TortoiseSVN which looks and works just like TortoiseCVS. I'm on OSX with OpenBSD and Linux servers and it's been easy to get it working over HTTPS. There are some OSX clients (notably svnx), but I find that once you figure out the commands, the command line interface is very easy to work with. Consensus seems to be that if you're just starting out in version control, go straight to svn so you can skip all the reasons that made them want an upgrade from cvs! Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] php + cvs
On 31 May 2005, at 15:40, Bostjan Skufca @ domenca.com wrote: is it possible to mount CVS/SVN repository as filesystem? Yes and no. Both keep stuff as normal files, but often as diffs and BDB databases. You really need to go through the appropriate client interface to extract data from it meaningfully. Also, you don't normally work directly on the repository but on a locally checked out version. This is what makes concurrent edits possible. SVN is typically implemented as a WebDAV service (possibly using SSL for security), and you can simply mount the webdav point as you would any other webdav file system. I guess you could check out a version remotely, then mount that area via webdav. Not sure what you'd gain though. Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Plugin systems
On 31 May 2005, at 15:21, Jochem Maas wrote: seems like alot of spreadout functionality to be putting it in a single class (maybe I'm not seeing your example in the proper light). That's possible, and I would only be able to implement a single plugin class within any given file (assuming simplistic namespacing). However, I do think that it's quite likely that any single plugin will likely only implement one or two interfaces so it should not get too messy. Think about photoshop here - you can just chuck plugins in the plugins folder, and they are all handled in the same way, regardless of whether they add file importing, exporting or image processing functions, or even all three at once. it sounds like lots of work, with the possibility that it will become overengineered... which has the affect of: 1. making code slow (introspection and reflection are not the speediest parts of the engine!) 2. make seemingly simple things difficult because of all the hoops you have created for yourself. Built-ins are almost always faster than 'userland' PHP code, and it seems that this approach might hit quite a few sweet spots in that respect. There's no particular reason this should have any great impact on speed as it's not really any different to loading a bunch of classes (something which is massively improved with an accelerator anyway). The plugin system needs to do several things: * locate plugin files (just normal readdir calls) * within located plugins, locate implementations of particular functionality (a simple call to class_implements) * run preferred implementation Smarty has quite a neat plugin mechanism, but it's quite limited in what it tries o do - for example there's no way you can directly build block, modifier and function plugins with identical functionality in a single file (though you could do it using a shared class and a bunch of includes - exactly the complexity I'm trying to avoid). How might I achieve this without using these built-in functions, and why might it be faster and less complex? There are some very complex plugin systems, such as the one recently added to MaxMediaManager which uses this model: http://www.martinfowler.com/articles/injection.html#UsingAServiceLocator but I'm wanting to keep things simpler. but then there is nothing to suggest that you can't make it work - the kind of thing you suggest doing is a good way of utilizing the advantages of the object model. I doubt it will be easy to write it well... but hey thats half the fun right?! :-) by all means hit the list with all your tricky little php5 problems, I for one will be on the look out for them :-) I get the feeling that it will actually be quite simple to write - that's partly why I'm wondering what's wrong with it ;^) 1. what is the objective you wish to accomplish with such a 'system'? The system I'm working on implements large chunks of functionality internally. I want to make it switchable so that I can reconfigure it to use external resources on a dynamic basis. My main aim is to build a kind of host environment and reimplement my internal functions as plugins so that all implementations of the functionality can share the same interfaces. Many applications are built this way - Apache and Dreamweaver MX spring to mind. 2. do you have a very strict definition of 'plugin'? (I have always found the word rather woolly/inexact) That's part of the point. With the mechanism I'm thinking of, I don't have to be too precise about what exactly a plugin might do - I only need to define the different plugin interfaces (which can be very strict) that it might conform to - implementation is wide open. I'd welcome a discussion of plugin mechanisms generally... Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] php + cvs
On 31 May 2005, at 17:57, Bostjan Skufca @ domenca.si wrote: a. It would create a posibility to run application directly from CVS if http server would have access to it It doesn't work that way - there are almost no circumstances under which you would want to access the repository without going through a client. The only case I can think of is for backup. You can automate checkouts from your repository - Subversion provides scripting hooks to do exactly that kind of thing automatically. You can set up a trigger like 'whenever someone makes a commit to this branch, do a checkout to this directory'. Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] PHP5 binaries
It seems that none of the current major Linux distros provide PHP5 binary installation packages. By major I mean, RedHat, Fedora (it will be in F4 when released), Mandriva, Debian, Ubuntu, possibly others. Seriously, none have standard PHP5 packages, even optional ones. Does no-one use PHP5??? It's not exactly bleeding edge, having made a final release nearly a year ago. I'm trying to set up an automatable installation system for such evident rarities as RedHat Enterprise Linux 4, and I just can't find anything workable. Even php4 binaries are rare (especially ones with flexible options including things like pcntl). Perl is massively supported, with binaries for hundreds of extensions widely available. Why does PHP get such second-rate treatment? Is it particularly hard to build packages for? I'm quite used to building PHP5 from source, but it's not the most elegant way of deploying things. The PHP download page says Most Linux distributions come with PHP these days, so if you do not want to compile your own, go to your distribution's download site., but that's no use if no-one actually provides them for current releases. Even in the various rpm repositories PHP5 is a rare beast - for example rpmforge's members don't include it. rpmbone provides some very basic rpms, but they suffer from dependency problems (even when accessed via apt-get). Any other ideas? Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Seeking decent domain registrar
On 14 May 2005, at 07:53, Richard Lynch wrote: For the record, no I haven't tried to go to that URL, because I don't even know how to type that symbol. Ah. I don't think you use a Mac ;^) MacOS (9 and X) has a wonderful system for typing any accented characters very easily (from an English keyboard) that can be explained and easily remembered in about 10 seconds. One simple technique enables me to type áéíóúäëïöüàèìòùöâêîôûñõ without having to remember large numbers of keystrokes or codes. If I did know how to type that non-ASCII symbol, I don't quite understand which of the umpteen extended character sets is going to get used by all the DNS machines, so I'd be kind of surprised if it worked, but, hey, if it all works and everybody is happy, it's all good. It's easy - it's all unicode mapped into ASCII so it works transparently with DNS systems, who don't have to think in anything other than plain ASCII. It's up to individual applications to map the presentational aspect - raw mappings will work in all applications - try going to www.xn--caf-dma.com (the punycode rendering of www.café.com). I feel sorry for anybody who has such a domain name, however, as it's going to be a real bear to get it listed/indexed correctly by search engines, I would guess. Maybe not. Maybe all the search engines are all ready for the non-ASCII domain names. [shrug] I certainly understand that the DNS space is now much bigger, and much nicer for non-English (or, perhaps more accurately, non-ASCII/Roman-alphabet) websites who can now get their domain name in their own native language. And I think that's really great. But it's sure gonna make it hard for a lot of users to figure out how to get there... Bear in mind that in languages that DO make use of accented (or just plain different) characters, they are utterly normal and everyday. Someone who considers cafe to be misspelled relative to café will find it EASIER to use the correct version than to have to translate into the English dumbing down of their language - that you might find it harder is not a consideration. Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Seeking decent domain registrar
On 13 May 2005, at 01:11, Richard Lynch wrote: On Thu, May 12, 2005 3:40 am, Marcus Bointon said: Multilingual domain support e.g. café.com Er. Maybe they changed the rules, but I don't think that's a valid domain name AT ALL. So maybe the reason you are having trouble is you are looking for something that cannot exist... They did change the rules starting in November 2000, with RFCs (3454, 3490, 3491, 3492) finalised in 2003. See http:// www.verisign.com/products-services/naming-and-directory-services/ naming-services/internationalized-domain-names/index.html This page may be of interest too: http://www.imc.org/idna/. Also, have you tried going to www.café.com? It works just fine for me (if you're using an antique browser like IE6 it may not work, though verisign have a free plugin to enable it). http://www.1stdomain.net/ does international registrations (though does not handle .co.uk domains). From a PHP point of view, http://pear.php.net/package/Net_IDNA/ what's needed. Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Seeking decent domain registrar
Somewhat OT - I've had almost entirely poor experiences with domain registrars, so I'm looking for recommendations. I need: .com, .net, .org domains (easy enough!) .co.uk support Multilingual domain support e.g. café.com Online control of DNS server assignment Specification of external DNS at registration time (so you don't have to change it unnecessarily afterwards) Multiple admin accounts (I run domains for other people in their names and I want to keep them separate) Don't need any forwarding, web hosting, email or anything beyond registration Low-cost would help of course! I've been googling for registrars, but as yet I've not found anyone that offers all this. Can anyone recommend a registrar that has a clue and a decent web interface? Thanks, Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Re: Valid email address syntax script?
On 3 May 2005, at 19:18, Matthew Weier O'Phinney wrote:
* Jm [EMAIL PROTECTED]:
Does anyone have a nice email address syntax checking script they'd
like to share? Regular expression-based anyone? TIA.
I use the following regex:
preg_match('/[EMAIL PROTECTED]@([-a-z0-9]+\.)+[a-z]{2,}$/i', $email)
I believe I got it out of the PHP Cookbook, by David Sklar, but I
can't
remember for certain. It's not 100% accurate, but I rarely have
complaints from users whose emails don't validate.
I've used this one quite heavily. It doesn't go as far as checking
TLDs, but it's quite tight on RFC2822 and allows things like numeric
addresses:
preg_match('/^(?:[\w\!\#\$\%\\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\
$\%\\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9](?:[a-zA-Z0-9\-]
(?!\.)){0,61}[a-zA-Z0-9]?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9\-](?!$)){0,61}
[a-zA-Z0-9]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?
\d{1,2}|2[0-4]\d|25[0-5])\]))$/', $email);
I got it from here - they have some more and some commercial products
that go further:
http://www.hexillion.com/samples/#Regex
Marcus
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[PHP] Mac OS X compilation problem
In the past I've had success compiling PHP4 on OS X. However, now I'm trying to get PHP5 working and not having much luck. I'm getting configure to work, and make goes ok until the final linking stage at which point I get this error: ld: unknown flag: -export-symbols make: *** [libs/libphp5.bundle] Error 1 It seems that that flag must be set in a make file somewhere (it's not in my environment), and it's certainly not documented in the OS X ld man pages. Not sure if it makes any difference, but most of the external modules that PHP uses are built from fink. I need some modules that are not supported in any of the pre-built fink PHP5 packages, and I'm used to compiling it without difficulty on Linux and OpenBSD. Anyone else run into this or have any idea how I might fix it? Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] strtotime time zone trouble
How is this not a bug?
?php
print date('Y-m-d H:i:s', strtotime('now UTC')).\n;
print date('Y-m-d H:i:s', strtotime('now PST')).\n;
?
outputs:
2005-01-18 09:58:09 (correct)
2005-01-18 17:58:09 (incorrect)
The time zone correction is applied in the wrong direction. Does it in
both current PHP 4 and 5.
Named time zones like these are supposedly deprecated, but the
suggested alternative in the docs doesn't work at all:
print date('Y-m-d H:i:s', strtotime('now UTC-0800')).\n;
1970-01-01 00:59:59
using 08:00 doesn't work either
Ideas?
Marcus
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Re: [PHP] strtotime time zone trouble
On 18 Jan 2005, at 10:53, Tom wrote:
PST = UTC - 8, therefore if you ask for strtotime in PST it will give
you now + 8. This is standard in most languages, you are just reading
the functionality back to front.
ie when you say strtotome('now PST'), what you are asking for is the
current local time (UTC in your instance) given an input date in PST
OK, I see some logic in that - now how to work around it?
try
print date('Y-m-d H:i:s', strtotime('now') -0800).\n;
That definitely won't work; -0800 will be interpreted as an octal
value, but it's not a legal value. If it was interpreted as a decimal
value, it would subtract 800 minutes, which is no use to anyone.
Numeric offsets are supposed to work inside the strtotime string param,
according to the docs.
Much of the point of using zone names rather than fixed numeric offsets
is that it allows for correct daylight savings calculations (assuming
that locale data is correct on the server).
Let me rephrase the question - how can I get the current time in a
named time zone using strtotime and without using a numeric offset?
Marcus
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Re: [PHP] oop too slow
on 19/8/04 9:49, Krzysztof Gorzelak at [EMAIL PROTECTED] wrote: Hi I'm trying my new php5 script, but it takes about 1.2s to generate my page. That is, how my oop model looks like : [category] ||| [photo] [desc] [products] [products] | [product] ||| [photo] [desc] [keys] [keys] | [key] | [values] | [value] Each object gets data from mysql by itself. The generation time of 1 category [30 products, 10 keys, 5 values ~= 300 mysql queries] takes as I said more than a 1s (on quite fast machine). How can this model be improved? Do I create too many objects ? What are the oop solutions for such problem ? This is something that I've wrestled with too. If you make each item you deal with a clean, self-sufficient object, with self-storage, data hiding etc, it is inevitable that you run into this problem. It is a symptom of a fundamental clash between Relational DB and OO points of view. The only trick I have found to work around it that is OO-clean is to use factory methods or objects that create multiple objects from a single DB query, so as well as having a 'get' method that populates an object from a DB, make another means of creating an object from local data that has been obtained from a larger query that returned sufficient values to populate multiple items. I also use an extra table to create many-to-many relation betwean a product and a key. Is this the only way in mysql ? [product] | [product_id, key_id] | [key] Yes, that's the correct way to represent a M:M relation in a relational DB. The join table is an artefact of a relational model, rather than an OO one, so the answer is to hide the existence of this table within the objects at either end - so have product and key objects, but not product_key objects. Each object should have a method that retrieves instances of all the related objects of the other kind. This is really a different manifestation of the first problem. Ultimately the trick is to create separate factory objects or higher-level methods inside the existing objects that can create multiple instances from a single database query. Having said that, it's difficult to spot the best places to do this. For example, you might normally create multiple product objects from an array of database IDs like so: foreach($productids as $id) $products[] = new product($id); You can see that this would cause a query for each instantiation. With a product factory class, you might do this instead: $products = product_factory::get($productids); Which achieves the same result, but using only a single DB query (hidden inside the factory class, which does NOT call the product class in the same way!). The next problem is keeping your product_factory and product classes in sync - I'm sure there must be a nice pattern to deal with that somewhere. Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] PHP 5 - $_REQUEST undefined???
I'm getting errors like this: Notice: Undefined variable: _REQUEST in /var/www/html/index.php on line 57 This is truly weird - why on earth would this superglobal be undefined? (and there is no unset($_REQUEST) lurking!) As far as I'm aware, there isn't even an ini option to turn it off. I'm in the process of upgrading from PHP4 to 5, and this script works ok in 4 - the error is just in 5. Any ideas? Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Creating a PHP5 RPM
I normally compile PHP straight from the regular source, however, this means that RPM loses track of what PHP version is installed on RedHat Linux (EL3), causing dependency and version mismatch problems. So it appears that I need to build an RPM from the normal source, then install it with RPM. However, I have no idea how to do this - can anyone give me some pointers? Is it as simple as adding a configure switch like --build-rpm? Thanks, Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] mysql and mysqli
I've got mysql 4.1.13 installed on RH EL 3 and I'm trying to build PHP5 against it with both mysql and mysqli extensions. It's quite happy to config and make with --with-mysql=/usr/local or --with-mysqli, but if I specify them both together (in either order), I get thousands of errors like this: /usr/lib/mysql/libmysqlclient.a(my_static.o)(.data+0x6b4): multiple definition of `my_default_record_cache_size' /usr/lib/mysql/libmysqlclient.a(my_static.o)(.data+0x6b4): first defined here Finally ending with: collect2: ld returned 1 exit status make: *** [libphp5.la] Error 1 I installed all of mysql from official RPMs, except for devel and shared modules which I compiled from the source RPM (These 4.1.13 binary RPMs are hard-wired to OpenSSL 0.9.6 so you can't use them on any recent OS). Any ideas to fix this? Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Preventing static method calls in PHP4
[repost, not sure if it worked last time]
If I want to prevent a method from being called statically in PHP4, how can
I do it? So far I've tried these techniques:
?php
class A {
var $Anotstatic;
function A() {
$this-Anotstatic = true;
}
function dynamic() {
if (!isset($this) or !is_a($this, 'A') or !(isset($this-Anotstatic) and
$this-Anotstatic))
echo Method called statically\n;
else
echo dynamic-only function\n;
}
function test ()
{
A::dynamic();
}
}
class B {
function test() {
A::dynamic();
}
}
$a = new A();
$a-dynamic();
A::dynamic();
$b = new B;
$b-test();
$a-test();
?
This works for the first 3 tests (so I'm getting there), but not the fourth,
that is a dynamic method being called statically from an instance of the
same class. Is there something I've missed that will allow me to intercept
this style of call?
I know that this problem goes away in PHP5, and that the setting of $this in
static calls from other instances is not a bug (though it's the root of this
problem)!
Marcus
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Re: [PHP] Re: Preventing static method calls in PHP4
on 22/7/04 10:49, Jason Barnett at [EMAIL PROTECTED] wrote: The easiest way I can think of to prevent static method calls is to use the $this pseudo variable in your method. A method *cannot* be used statically if the method requires use of $this. Unfortunately that doesn't work - it is exactly the case that fails in my example. $this IS set in a static method that's called from any object instance (even one of a different class), and it's a PHP feature, not a bug. Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] run perl script with php
on 22/7/04 10:42, Tassos T at [EMAIL PROTECTED] wrote:
i faced a small problem i have a perl script but i want to execute that
in a php script. unfortunately i cannot convert to php.
No problem, look at:
http://uk2.php.net/manual/en/function.system.php
http://uk2.php.net/manual/en/function.exec.php
http://uk2.php.net/manual/en/function.passthru.php
E.g. system('myperlscript.pl');
Marcus
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[PHP] Preventing static method calls in PHP4
If I want to prevent a method from being called statically in PHP4, how can
I do it? So far I've tried these techniques:
?php
class A {
var $Anotstatic;
function A() {
$this-Anotstatic = true;
}
function dynamic() {
if (!isset($this) or !is_a($this, 'A') or !(isset($this-Anotstatic) and
$this-Anotstatic))
echo Method called statically\n;
else
echo dynamic-only function\n;
}
function test ()
{
A::dynamic();
}
}
class B {
function test() {
A::dynamic();
}
}
$a = new A();
$a-dynamic();
A::dynamic();
$b = new B;
$b-test();
$a-test();
?
This works for the first 3 tests (so I'm getting there), but not the fourth,
that is a dynamic method being called statically from an instance of the
same class. Is there something I've missed that will allow me to intercept
this style of call?
I know that this problem goes away in PHP5, and that the setting of $this in
static calls from other instances is not a bug (though it's the root of this
problem)!
Marcus
--
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Synchromedia Limited: Putting you in the picture
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Re: [PHP] Zend Enc and 0T Q
on 21/7/04 16:59, PHP Gen at [EMAIL PROTECTED] wrote: News to me, I thought each encryptor has its own style of encrypting the phpwill check up but I think thats true. Mmcache says explicitly that its output is compatible with Zend encoder. Also note that encryption is not the same as encoding. Marcus -- Marcus Bointon Synchromedia Limited: Putting you in the picture [EMAIL PROTECTED] | http://www.synchromedia.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
