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By default, my Emacs opens config.php in conf-mode. It looks like conf-mode uses a set of regular expressions to match the filename, but I can't figure out how to make it open in php-mode.

Any idea?

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  • That's because the entries for conf-mode come before the entries for php-mode in auto-mode-alist.
    – legoscia
    Feb 4 '15 at 11:07
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You can add an entry specifically for config.php into auto-mode-alist, as follows:

(add-to-list 'auto-mode-alist (cons (rx bos "config.php" eos) 'php-mode))

(Where bos and eos are shortcuts for string-start and string-end, abbreviated from Beginning/End Of String.)

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