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php's -> symbol confused for ?> symbol in preview mode
The '->' symbol (php), is being treated as the '?>' symbol, for the purpose of "preview mode".
The causes php code to be rendered, not hidden.
Customer support service by UserEcho
Due to restrictions of iOS, Textastic does not include a PHP interpreter. Textastic can locally preview HTML, CSS, JavaScript and Markdown. For PHP files, you can upload the file to a (test) server and enter the url in the remote preview screen.