Programming PHP

Example 13-3. Template script (continued)
if (!empty($name)) {
// do something with the supplied values
$template = "thankyou.template";
$bindings['NAME'] = $name;
}
else {
$template = "user.template";
}
echo FillTemplate($template, $bindings);
Example 13-4 shows the FillTemplate( ) function used by the script in Example 13-3.
The function takes a template filename (to be located in the document root in a directory
called templates), an array of values, and an optional instruction denoting what
to do if a marker is found for which no value is given. The possible values are:
"delete", which deletes the marker; "comment", which replaces the marker with a
comment noting that the value is missing; or anything else, which just leaves the
marker alone.
Example 13-4. The FillTemplate( ) function
function FillTemplate($inName, $inValues = array( ),
$inUnhandled = "delete") {
$theTemplateFile = $_SERVER['DOCUMENT_ROOT'] . '/templates/' . $inName;
if ($theFile = fopen($theTemplateFile, 'r')) {
$theTemplate = fread($theFile, filesize($theTemplateFile));
fclose($theFile);
}
$theKeys = array_keys($inValues);
foreach ($theKeys as $theKey) {
// look for and replace the key everywhere it occurs in the template
$theTemplate = str_replace("\{$theKey}", $inValues[$theKey],
$theTemplate);
}
if ('delete' == $inUnhandled ) {
// remove remaining keys
$theTemplate = eregi_replace('{[^ }]*}', '', $theTemplate);
} elseif ('comment' == $inUnhandled ) {
// comment remaining keys
$theTemplate = eregi_replace('{([^ }]*)}', '',
$theTemplate);
}
return $theTemplate;
}
Clearly, this example of a templating system is somewhat contrived. But if you think
of a large PHP application that displays hundreds of news articles, you can imagine
how a templating system that used markers such as {HEADLINE}, {BYLINE}, and
300 | Chapter 13: Application Techniques
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