Articles Site Operation
Site Operation
Cached Dynamic Modules - Page 4
by: JP
|
July 30, 2000
The parse_it function scans the string to see if any tag occurs, and if it does, break
down the tagname in $fun and its optional parameters into the associated array $arglist.
<?php
function parse_it ($str) {
global $loaded;
if (eregi ("<[Mm][Yy]-([A-Za-z0-9]*) ([^>]*)", $str, $regs)) {
$tag = $regs[1];
if (!$loaded[$tag]) {
include "res/$tag/$tag.php";
$loaded[$tag] = 1;
}
$fun = "handle_$tag";
$list = explode (" ", strtolower ($regs[2]));
$cache_file = "cache/$tag";
for ($i = 0; $i < count ($list); $i++) {
if ($argname = strtok ($list[$i], "=")) {
$arglist[$argname] = strtok ("=");
if ($argname != "cache") {
$cache_file .= "_" . $argname . "=" . $arglist[$argname];
}
}
}
$buf = "<!-- $tag start here //-->\n";
$buf .= $fun ($arglist);
$buf .= "\n<!-- $tag ends here //-->\n";
return $buf;
} else {
return $str;
}
}
?>
This function calls the function $tag directly in the file included from res/$tag/$tag.php
and uses the output to return to the parse main loop.
As you notice, the variable $cache_file is also being built pointing to cache/$tag...
where ... is a string combining all parameters to form a unique cache entry for this tag. To
actually use the cache, we must add some code between the end of the for loop and the creation of $buf:
<?php
$read_cache = 0;
$write_cache = 0;
if (!(isset ($arglist["cache"]) && ($arglist["cache"] < 10))) {
$write_cache = 1;
if (file_exists ($cache_file)) {
if (!isset ($arglist["cache"])) {
if ((filemtime ($cache_file) + $default_cache_time) > date ("U")) {
$read_cache = 1;
$write_cache = 0;
}
} else {
if ((filemtime ($cache_file) + $arglist["cache"]) > date ("U")) {
$read_cache = 1;
$write_cache = 0;
}
}
}
}
?>
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