How to handle PHP parse errors?

You have to close the PHP context if you use raw HTML output. Instead of …

<?php
global $EM_Event;
<div class="content_left">

    <?php gteventstore_before_loop(); ?>

… close PHP before the div:

<?php
global $EM_Event;
?>
<div class="content_left">

    <?php gteventstore_before_loop(); ?>

Use an IDE with a PHP parser to see such syntax errors early. You code looks in Eclipse PDT like this:

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If you tip the red icon you get an explanation:

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Read more about Eclipse and WordPress.