PHP 0 aka "Personal Home Page" was 1994 Perl and never released, nor called PHP.

PHP 1 aka "PHP Tools - Personal Home Page Tools" was C and released 1995.

PHP ? aka "Personal Home Page Construction Kit" (www.php.net/manual/phpfi2.php)

PHP 2 aka "PHP/FI 2.0 - Personal Home Page/Form Interpreter" (like CGI+DBI)