Template Driven PHP Architecture
By Inforlinx2004-06-23
The variable
+---------------------------------+
| Alvin | Block 112 Bedok Road |
+---------------------------------+
| Robert | 23 Livingstone Road |
+---------------------------------+
:
:
+---------------------------------+
| John | 556 Everton Park Road |
+---------------------------------+
Line 10 (and line 11) of the code simply is a "rule" that instructs the PHP script to replace occurrences of the string <!--NAME-DATA--> with FIELD 1 (array is "zero-based") of the recordset provided in the $recordset_array array
All the work will then be performed by the PHP function: template_parser. The detailed workings of template_parser function is as follows :
Function template_parser
function template_parser ($template_filename, $replacement_rules, $recordset_array)
{
$START_FLAG = 0;
$start_anchor=0;
$end_anchor=0;
$res_arr="";
$fcontents = file (TEMPLATES_PATH . $template_filename);
while (list ($line_num, $line) = each ($fcontents))
{
if ($START_FLAG == 0)
{
if (ereg ('<!--START_ROW-->', $line))
{
$START_FLAG = 1;
$start_anchor = $line_num;
}
}
else
{
if (!ereg ('<!--END_ROW-->', $line))
{
$res_arr .= $line;
}
else
{
$START_FLAG = 0;
$end_anchor = $line_num;
}
}
}
/* Build String-Replacement Rules ... */
$tmp_res_arr = "";
$n = count($data_array);
for ($x=0; $x<$n; $x++)
{
$tmp = $res_arr;
for ($y=0; $y<count($replacement_rules); $y++)
{
$a = $replacement_rules[$y][0];
$b = $replacement_rules[$y][1];
if (ereg ("<!", $a))
{
$data_array[$x][$b] = stripslashes ($data_array[$x][$b]);
eval ("\$tmp = str_replace (\"$a\", \$data_array[\$x][$b], \$tmp);");
$tmp = stripslashes($tmp);
}
}
$tmp_res_arr .= $tmp;
}
$res_arr = $tmp_res_arr;
/* Re-constructing the file-contents ... */
$n = count($fcontents);
for ($x=0; $x<$n; $x++)
{
$y = $start_anchor + ($x - $end_anchor) ;
if (($x >= $start_anchor) and ($x < $end_anchor))
{
if ($n_fcontents[$start_anchor] == "")
$n_fcontents[$x] = $res_arr;
}
elseif ($x > $end_anchor)
$n_fcontents[$y] = $fcontents[$x];
else
$n_fcontents[$x] = $fcontents[$x];
}
return ($n_fcontents);
} // end function template_parser
What the above does is to "reproduce" the HTML codes surrounded by both HTML-comment tags :
<!--START_ROW--> and <!--END_ROW-->
as many times as the number of rows found in the $recordset_array array, yet with the intelligence to replace data fields (columns of $recordset_array array) in places defined in the $replacement_rules array without affecting the original HTML formatting.
When all the necessary replacements have been done, the entire HTML page will be "echoed" out by PHP.
Tutorial pages:
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