SASL is the Simple Authentication and Security Layer (as defined by RFC 2222). It provides a system for adding plugable authenticating support to connection-based protocols. The SASL Extension for PHP makes the Cyrus SASL library functions available to PHP. It aims to provide a 1-to-1 wrapper around the SASL library to provide the greatest amount of implementation flexibility. To that end, it is possible to build both a client-side and server-side SASL implementation entirely in PHP.
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