PHP contains two dedicated mail functions, which are built into PHP by default. The mail() function allows for the sending of email directly from a script, and ezmlm_hash() provides a hash calculation useful for interfacing a script to an EZMLM mailing list system.
The mail() function requires an installed and working email subsystem for sending mail. The program to be used is defined by configuration directives in the php.ini file. A common pitfall is that these are not set up correctly, rendering mail() inoperable. Note that the first two directives are for use only on Windows systems; the third is for use only on Unix-type systems.
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.