I'm experimenting with running xml with php. I have a sample script and a data file which runs fine on the localhost, however the same script produces a whole bunch of Undefined index warnings on the actual server. First accurance is the second statement in the start_element function:
if (($this->field_type[$element] != 0) {...
<html>
<head><title>My Library</title></head>
<body>
<?php
class BookList {
var $parser;
var $records;
var $record;
var $current_field = '';
var $field_type;
var $ends_record;
function BookList ($filename) {
$this->parser = xml_parser_create();
xml_set_object($this->parser, &$this);
xml_set_element_handler($this->parser, 'start_element', 'end_element');
xml_set_character_data_handler($this->parser, 'cdata');
// 1 = single field, 2 = array field, 3 = record container
$this->field_type = array('title' => 1,
'author' => 2,
'isbn' => 1,
'comment' => 1);
$this->ends_record = array('book' => true);
$x = join("", file($filename));
xml_parse($this->parser, $x);
xml_parser_free($this->parser);
}
function start_element ($p, $element, &$attributes) {
$element = strtolower($element);
if ($this->field_type[$element] != 0) {
$this->current_field = $element;
} else {
$this->current_field = '';
}
}
function end_element ($p, $element) {
$element = strtolower($element);
if ($this->ends_record[$element]) {
$this->records[] = $this->record;
$this->record = array();
}
$this->current_field = '';
}
function cdata ($p, $text) {
if ($this->field_type[$this->current_field] === 2) {
$this->record[$this->current_field][] = $text;
} elseif ($this->field_type[$this->current_field] === 1) {
$this->record[$this->current_field] .= $text;
}
}
function show_menu() {
echo "<table border=1>\n";
foreach ($this->records as $book) {
echo "<tr>";
$authors = join(', ', $book['author']);
printf("<th align=left><a href='%s'>%s</a></th><td>%s</td></tr>\n",
$_SERVER['PHP_SELF'] . '?isbn=' . $book['isbn'],
$book['title'],
$authors);
echo "</tr>\n";
}
echo "</table>\n";
}
function show_book ($isbn) {
foreach ($this->records as $book) {
if ($book['isbn'] !== $isbn) {
continue;
}
$authors = join(', ', $book['author']);
printf("<b>%s</b> by %s.<br>", $book['title'], $authors);
printf("ISBN: %s<br>", $book['isbn']);
printf("Comment: %s<p>\n", $book['comment']);
}
?>
Back to the <a href="<?= $_SERVER['PHP_SELF'] ?>">list of books</a>.<p>
<?
}
};
// main program code
$my_library = new BookList ("books.xml");
if ($_GET['isbn']) {
// return info on one book
$my_library->show_book($_GET['isbn']);
} else {
// show menu of books
$my_library->show_menu();
}
?>
</body></html>
And here's the xml file:
<?xml version="1.0" ?>
<library>
<book>
<title>Programming PHP</title>
<authors>
<author>Rasmus Lerdorf</author>
<author>Kevin Tatroe</author>
</authors>
<isbn>1-56592-610-2</isbn>
<comment>A great book!</comment>
</book>
<book>
<title>PHP Pocket Reference</title>
<authors>
<author>Rasmus Lerdorf</author>
</authors>
<isbn>1-56592-769-9</isbn>
<comment>It really does fit in your pocket</comment>
</book>
<book>
<title>Perl Cookbook</title>
<authors>
<author>Tom Christiansen</author>
<author>Nathan Torkington</author>
</authors>
<isbn>1-56592-243-3</isbn>
<comment>Hundreds of useful techniques, most just as applicable to
PHP as to Perl
</comment>
</book>
</library>
Thanks for checking this out.
