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In PHP 5.4 and higher the short_open_tag=on directive applies to all short tags except <?= - the echo tag. Since PHP 5.4 and higher the short echo tag <?= is always available and not affected by the short_open_tag ini directive. In PHP 5.4 and higher the short_open_tag=on directive applies to all short tags except <?= - the echo tag. Since PHP 5.4 and higher the short echo tag <?= is always available and not affected by the short_open_tag ini directive. Possible security risk? Byte-shifted code injection see: https://nealpoole.com/blog/2010/07/php-security-tip-beware-the-opening-tags/ <nowiki>PHP <script> Tags</nowiki> - All PHP installations will parse PHP code written with the old HTML style PHP script tags.