<?php
# -------------------------------------------------------------------------------------------------
#
# replaceObjEmbed.php / replaceObjEmbed.js / 2006-07-01
# (C) Gero Zahn, gero@gerozahn.de
#
# -------------------------------------------------------------------------------------------------
#
# Replaces <object ...>...</object> / <applet ...>...</applet> / <embed ...>..</embed> areas
# on the fly by a JavaScript wrapper to prevent "Click to activate" in MSIE 6+ and Opera 9+.
# Can be used with existing PHP files -- with a proper .htaccess also with HTML files.
#
# May be used and copied for free in any environment (free or commercial).
#
# If you like to update or change this code, please keep the original copyright intact --
# and inform me via email about your enhancement.
#
# -------------------------------------------------------------------------------------------------
#
# ========== Usage on PHP files:
#
# 1. Copy replaceObjEmbed.php and replaceObjEmbed.js next to your PHP file.
#
# 2. Add this to the beginning of your PHP file
# <?php
# ob_start();
# ? >
# (remove blank before last ">")
#
# 3. Add this to the eng of your PHP file
# <?
# include_once "replaceObjEmbed.php";
# echo replaceObjEmbed(ob_get_clean());
# ? >
# (remove blank before last ">")
#
# If you plan to put replaceObjEmbed.php and replaceObjEmbed.js in a subfolder, use this instead:
#
# <?
# include_once "yoursubfolder/replaceObjEmbed.php";
# echo replaceObjEmbed(ob_get_clean(),"yoursubfolder");
# ? >
# (remove blank before last ">")
#
# ========== Usage on HTML files:
#
# Basically the same as above, but you need to persuade your Apache to parse plain HTML files for
# PHP. This can be done easily with a proper .htaccess file.
#
# Add the following line to your .htaccess file:
#
# AddType application/x-httpd-php .html
#
# If this doesn't work, try this:
#
# AddType x-mapp-php4 .html
#
# This last one works for 1&1 and Schlund+Partner servers in German. You may want to contact
# the tech-support of your server provider for closer information how to achieve this.
#
# -------------------------------------------------------------------------------------------------
# 2006-06-30 - First release: Could just handle <object ...>...</object> areas
# 2006-07-01 - Adaptation: Can handle object/applet areas as well as single embed tags
function replaceObjEmbed($x,$jsdirprefix=".") {
# @param $x:
# Code to be re-formatted - usually the buffered output ob_get_clean() at the very end of the file
# @param $jsdirprefix
# Path prefix to replaceObjEmbed.js - defaults to "." if omitted
# All tag areas or tags to be processed. Important: Start with <object ...>...</object> areas
# as it could contain an <embed ...>..</embed> area or (perhaps) an unclosed <embed ...> tags
$tags=array('`<object[^>]*>(.*)</object>`isU', # <object ...>...</object> areas
'`<applet[^>]*>(.*)</applet>`isU', # <applet ...>...</applet> areas
'`<embed[^>]*>(.*)</embed>`isU', # <embed ...>..</embed> areas
'`<embed[^>]*>`isU'); # single, unclosed <embed ...> tags outsite object areas
$replacements=array(); # Storage for the elements found to be processed
foreach(array_keys($tags) as $idx) { # Handle all kings of tag areas and tags, one by one
$tmptags=array(); # Storage for the found occurrences
preg_match_all($tags[$idx],$x,$tmptags); # And here they are
if ($tmptags) { # Found some?
foreach(array_keys($tmptags[0]) as $secidx) { # Deal with them, one by one
# We have to move them apart -- especially <object ...>...</object> areas with an internal
# <embed ...>..</embed> area or an unclosed <embed ...> tag -- otherwise they'd be found again.
$tagval=$tmptags[0][$secidx]; # This is the current occurrence to be processed later on
$tagkey="replacetag_".$idx."_".$secidx; # Temporarily replace it by "replacetag_x_y"
# ... where x is 0..3 (object/applet/embed/s.embed) and y is the corresponding number.
$replacements[$tagkey]=$tagval; # Store the occurrence beside it's unique key ...
$x=str_replace($tagval,$tagkey,$x); # ... and actually replace the occurrence with the key
}
}
unset($tmptags); # A bit of dirty work
}
foreach($replacements as $tagkey => $tagval) { # Handle all occurrences, one by one
$jsval=addslashes($tagval); # Handle special characters properly
$jsval=str_replace(chr(13),"",$jsval); # remove CRs - all in one line
$jsval=str_replace(chr(10),"",$jsval); # remove LFs - all in one line
# 1. Embed that tiny little external JS to work as actual embedder.
# 2. Embed the original occurrence inside a JS variable --
# 3. Call the tiny little embedder to dynamically output the variable
# 4. Embed the original, unchanged occurrence in a <noscript>...</noscript> area as fall-back
$jsval= "<script src=\"$jsdirprefix/replaceObjEmbed.js\" type=\"text/javascript\"></script>\n".
"<script language=\"JavaScript\">\n".
"<!--\n".
"var jsval = '$jsval';\n".
# "//document.write(jsval);". # This doesn't work as it's an internal document.write(...)
"writethis(jsval);". # So: Use the external one-liner function to perform the trick
"//-->\n".
"</script>\n".
"<noscript>$tagval</noscript>";
# The original occurrence has been replaced with its unique "key" beforehanded,
# now replace this stored key with is JS wrapper and noscript fallback.
$x=str_replace($tagkey,$jsval,$x);
}
unset($replacements); # A bit of dirty work
return $x; # And we're out!
}
?>
