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Returns TRUE if the filename exists and is executable.
is_executable() became available with Windows in PHP version 5.0.0.
Not: The results of this function are cached. See clearstatcache() for more details.
Tips: As of PHP 5.0.0 this function can also be used with some URL wrappers. Refer to Appendix M for a listing of which wrappers support stat() family of functionality.
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is_dir | Upp | is_file |