Regex question

[phpscriptcoder]

Hi,

I'm trying to make a simple templating system for use in another script. I want to have a feature to include another template file, but am not sure how.

This is what I am trying to use ($template is the contents of the template file).

 

$template = preg_replace('/\{\{([^\}]+)\}\}/', file_get_contents('\\\0'), $template);

 

It tries to include the file \\\0 rather than the correct filename.

 

This is supposed to match a string like {{header.html}} and replace it with the contents of the file within the braces.

 

I have tried some different methods, but none of them work.

 

Thanks.

[thebadbad]

Try using preg_replace_callback() if you want a function to be run before replacing content. preg_replace() takes strings as parameters - file_get_contents('\\\0') is not a string. Also, shouldn't you use "\\1" instead of "\\\0"?

 

<?php
function evaluate($matches) {
return file_get_contents($matches[1]);
}
$template = preg_replace_callback('/\{\{([^\}]+)\}\}/', 'evaluate', $template);
?>

[effigy]

Use the /e modifier and quote your function, e.g.:

 

<pre>
<?php
echo $alpha = join('', range('A', 'Z'));
echo '<br>';
echo preg_replace('/[^AEIOU]/e', 'strtolower("\0")', $alpha);

?>
</pre>

[phpscriptcoder]

Try using preg_replace_callback() if you want a function to be run before replacing content. preg_replace() takes strings as parameters - file_get_contents('\\\0') is not a string. Also, shouldn't you use "\\1" instead of "\\\0"?

 

<?php
function evaluate($matches) {
return file_get_contents($matches[1]);
}
$template = preg_replace_callback('/\{\{([^\}]+)\}\}/', 'evaluate', $template);
?>

 

Thanks, that worked.

[phpscriptcoder]

Is it possible to pass additional arguments to the callback function?

 

My code for the templater so far:

<?php
function process_include($matches)
{
return templater(file_get_contents($matches[1]), $vars);
}
function templater($file, $vars)
{
$template = file_get_contents(templates.'/'.$file);
foreach($vars as $k => $v)
{
	$template = str_replace('[$'.$k.']', $v, $template);
}
$template = preg_replace_callback('/\{\{([^\}]+)\}\}/', 'process_include', $template);
echo $template;
}
?>

I am calling the templater function recursively so the additional template files will be processed as well. $vars is set in the file calling the templater, and I need to pass it every time the templater is called recursively. Any help?

[phpscriptcoder]

Probably not the best way but I changed the process_include function to use the variable as a global.

[effigy]

Is it possible to pass additional arguments to the callback function?

 

I don't think so. Would create_function work, as shown in Example #1?