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Writing a Template System in PHP

By: bluephoenix	Search For More Articles! Disclaimer Author Terms
Rating: / 69
2004-01-13

Table of Contents:

Writing a Template System in PHP

The Implementation

The Template File

The Class Skeleton

Constructor and Output

Replacing Tags

Including Dynamic Files

The Final Code

Tricks

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Writing a Template System in PHP - Replacing Tags

(Page 6 of 9 )

Next came time to write the workhorse method of the class, the replace_tags method.

<?php
function replace_tags($tags = array()) {
  if (sizeof($tags) &gt; 0)
    foreach ($tags as $tag =&gt; $data) {
      $data = (file_exists($data)) ? join("", file($data)) : $data;
      $this-&gt;page = eregi_replace("{" . $tag . "}", $data,
                    $this-&gt;page);
    }
  else
    die("No tags designated for replacement.");
}
?>

The method accepts an incoming array of references to replacement data keyed by place holder. A foreach statement cycles through the array.

With each iteration of the foreach, a check is made to see if the value is a filename. If it is then the file's contents is loaded as the replacement data; if it isn't then it's assumed the data was passed as straight text. This allows the method to be a bit more flexible for the end user.

Once it's determined what the replacement data is, the placeholders (along with it's delimiters) are swapped out with the corresponding information. While ereg_replace might be more appropriate, I chose to allow for case insensitivity again as a convenience factor.

Next: Including Dynamic Files >>

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