> On Mon, 06 Aug 2001, [EMAIL PROTECTED] wrote:
> > ID: 12477
> > User updated by: [EMAIL PROTECTED]
> > Reported By: [EMAIL PROTECTED]
> > Status: Closed
> > Bug Type: Feature/Change Request
> > Operating System: Linux and SCO
> > PHP Version: 4.0.6
> > New Comment:
> >
> > I was trying to have to walk the array twice.
> >
> > The following works:
> >
> > $pagevars = str_replace("$","\\\$",$pagevars);
> > $page = preg_replace($template,$pagevars,$page);
> >
> > The reason for using preg_replace is that it does a recursive? replace.
>
> What do you mean, 'recursive' replace?
Example (using shortened arrays):
In my system I build a complete page and then echo it to the browser. All of the
Navigation records and other content pages for the
site are contained in a MySql database.
The only fielsystem files that exist are the main index.php3 script, a site
configuration file that contains defaults for variables
that is imported into a class called "site", and the template pages.
The Navigation record for a page determines what needs to happen to it
programmatically (form, database form, text, upload, download
etc...) and whether the page comes from HTTPS or HTTP servers.
//SETUP PAGE STUFF
$template=array(
"/({PAGEMAIN})/",
"/({PAGELINKS})/",
"/({PAGETEXT})/",
"/({LINKSDATA})/",
"/({PAGEDATA})/"
);
$pagevars=array(
"PAGEMAIN" => get_page($site->page_main),
"PAGELINKS" => get_page($site->page_links),
"PAGETEXT" => get_page($site->page_text),
"LINKSDATA" => "",
"PAGEDATA" => ""
);
$page = "{PAGEMAIN}";
$pagevars = str_replace("$","\\\$",$pagevars); // preserve dollar signs in page text
$page = preg_replace($template,$pagevars,$page);
The get_page() fuinction just grabs a text file and stuffs its contents into the
variable.
PAGEMAIN
--------
<!-- OUTPUT MAIN BODY TABLE -->
<table border='0' cellpadding='0' cellspacing='0' width='{WIDTH}' height='77%'>
<tr valign='top'>{PAGELINKS}{PAGETEXT}</tr>
</table>
<!-- OUTPUT MAIN BODY TABLE -->
PAGELINKS
---------
<!-- OUTPUT LINKS SECTION CELL -->
<td class='background'>
<table class='linkstable' width='160' border='0' cellspacing='0' cellpadding='0'>
{LINKSDATA}
<tr valign='top'>
<td class='linksgap'><img src='/{IMAGES}/clear.gif' width='158' height='3'
border='1'></td>
</tr>
</table>
</td>
<!-- OUTPUT LINKS SECTION CELL -->
PAGETEXT
--------
<!-- OUTPUT PAGE TEXT TABLE -->
<td width='{WIDTH}'>
<table width='99%'>
<tr valign='top'><td><img src='/{IMAGES}/clear.gif' border='0' height='15'
width='99%'></td></tr>
<tr valign='top'>
<td><!--PAGEDATA-->
{PAGEDATA}
<!--PAGEDATA-->
</td></tr>
<tr valign='top'><td><img src='/{IMAGES}/clear.gif' border='0' height='15'
width='99%'></td></tr>
</table>
</td>
<!-- OUTPUT PAGE TEXT TABLE -->
Because preg_replace walks through the array from top to bottom it becomes "sort of"
recursive as the resulting string keeps getting
bigger as each variable replacement occurs.
$page
- starts with "{PAGEMAIN}"
- replaced with PAGEMAIN template which contains "{PAGELINKS}{PAGETEXT}"
- {PAGELINKS} is replaced with PAGELINKS template which contains {LINKSDATA}
- {PAGETEXT} is replace with PAGETEXT template which contains {PAGEDATA}
- {LINKSDATA} is replaced with programmatically built HTML for links on page
- {PAGEDATA} is replaced with programatically built HTML for the text of the page
(form, document etc..)
The end result is a string of HTML.
I hope this is clear. I may have put you wrong with the use of the word "recursive"?
I wasn't really sure what term to use. "Ever
Expanding"?
Regards
Grant Walters
Brainbench 'Most Valuable Professional' for Unix Admin
P O Box 13-043 Johnsonville, Wellington, NEW ZEALAND
Telephone: +64 4 4765175, CellPhone 025488265, ICQ# 23511989
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