What version of PHP introduced the <?php tag?

I'm creating a test server for a new client that has and older version of PHP that only uses the 开发者_开发百科<? tags but the latest version of PHP is expecting <?php tags.

I'm looking for the version I need to install so that I can run the old code without changing any of it.

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You just need to enable short_open_tag to use that short version of the standard PHP tags <?php.

But I wouldn’t do that but just replace the short tags <? with the standard PHP tags <?php for portability.

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To the best of my knowledge, <?php has always been available. <? aka short tags are only available when the directive is allowed in php.ini

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the short tag can be used in any version of PHP. You just need to allow it in the php.ini: http://php.net/manual/en/ini.core.php

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Out of curiosity I downloaded some of the older versions of PHP from the museum, and all of the examples in version 'php-2.0' only used <? to open the tags. So I'm going to assume version 1.0 and 2.0 only used <? and <?php was introduced in either a later version of 2 or 3.0.

I really wouldn't suggest using any of the old versions of PHP though, mess around with the php.ini and you should be able to get the script working on 4.0.