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www.it-ebooks.infoCHAPTER 2 • CONFIGURING YOUR ENVIRONMENTenable_dl = On | OffScope: PHP_INI_SYSTEM; Default value: OffThe enable_dl() function allows a user to load a PHP extension at run time—that is, during ascript’s execution.Fopen WrappersThis section contains five directives pertinent to the access and manipulation of remote files.allow_url_fopen = On | OffScope: PHP_INI_ALL; Default value: OnEnabling allow_url_fopen allows PHP to treat remote files almost as if they were local. Whenenabled, a PHP script can access and modify files residing on remote servers, if the files have the correctpermissions.from = stringScope: PHP_INI_ALL; Default value: NULLThe title of the from directive is perhaps misleading in that it actually determines the password,rather than the identity, of the anonymous user used to perform FTP connections. Therefore, if from isset like thisfrom = "jason@example.com"the username anonymous and password jason@example.com will be passed to the server whenauthentication is requested.user_agent = stringScope: PHP_INI_ALL; Default value: NULLPHP always sends a content header along with its processed output, including a user agentattribute. This directive determines the value of that attribute.default_socket_timeout = integerScope: PHP_INI_ALL; Default value: 60This directive determines the time-out value of a socket-based stream, in seconds.auto_detect_line_endings = On | OffScope: PHP_INI_ALL; Default value: OffOne never-ending source of developer frustration is derived from the end-of-line (EOL) characterbecause of the varying syntax employed by different operating systems. Enablingauto_detect_line_endings determines whether the data read by fgets() and file() uses Macintosh,MS-DOS, or Linux file conventions.35