Files with the .phtml extension are most commonly associated with PHP Web pages. The PHTML files contain PHP code that is parsed by a PHP engine. This allows the Web server to generate dynamic HTML that is displayed in a Web browser. The PHTML files are often used to access databases. The pages containing the PHTML code are usually displayed with the .php page extension.
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If you have additional information about the PHTML file format or software that uses files with the PHTML suffix, please do get in touch - we would love hearing from you.