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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Introduction</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.ldap.html">LDAP</a></div> <div class="next" style="text-align: right; float: right;"><a href="ldap.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.ldap.html">LDAP</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="intro.ldap" class="preface"> <h1 class="title">Introduction</h1> <p class="para"> LDAP is the Lightweight Directory Access Protocol, and is a protocol used to access "Directory Servers". The Directory is a special kind of database that holds information in a tree structure. </p> <p class="para"> The concept is similar to your hard disk directory structure, except that in this context, the root directory is "The world" and the first level subdirectories are "countries". Lower levels of the directory structure contain entries for companies, organisations or places, while yet lower still we find directory entries for people, and perhaps equipment or documents. </p> <p class="para"> To refer to a file in a subdirectory on your hard disk, you might use something like: </p> <pre class="literallayout"> /usr/local/myapp/docs </pre> <p class="para"> The forwards slash marks each division in the reference, and the sequence is read from left to right. </p> <p class="para"> The equivalent to the fully qualified file reference in LDAP is the "distinguished name", referred to simply as "dn". An example dn might be: </p> <pre class="literallayout"> cn=John Smith,ou=Accounts,o=My Company,c=US </pre> <p class="para"> The comma marks each division in the reference, and the sequence is read from right to left. You would read this dn as: </p> <pre class="literallayout"> country = US organization = My Company organizationalUnit = Accounts commonName = John Smith </pre> <p class="para"> In the same way as there are no hard rules about how you organise the directory structure of a hard disk, a directory server manager can set up any structure that is meaningful for the purpose. However, there are some conventions that are used. The message is that you can not write code to access a directory server unless you know something about its structure, any more than you can use a database without some knowledge of what is available. </p> <p class="para"> Lots of information about LDAP can be found at </p> <ul class="itemizedlist"> <li class="listitem"> <p class="para"> <a href="http://www.mozilla.org/directory/" class="link external">» Mozilla</a> </p> </li> <li class="listitem"> <p class="para"> <a href="http://www.openldap.org/" class="link external">» OpenLDAP Project</a> </p> </li> </ul> <p class="para"> The Netscape SDK contains a helpful <a href="http://www.mozilla.org/directory/csdk-docs/" class="link external">» Programmer's Guide</a> in HTML format. </p> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="book.ldap.html">LDAP</a></div> <div class="next" style="text-align: right; float: right;"><a href="ldap.setup.html">Installing/Configuring</a></div> <div class="up"><a href="book.ldap.html">LDAP</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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