Using the PHP LDAP calls
Before you can use the LDAP calls you will need to know...
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The name or address of the directory server you will use
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The "base dn" of the server (the part of the world directory that is held on this server, which could be "o=My Company,c=US")
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Whether you need a password to access the server (many servers will provide read access for an "anonymous bind" but require a password for anything else)
The typical sequence of LDAP calls you will make in an application will follow this pattern:
ldap_connect() // establish connection to server | ldap_bind() // anonymous or authenticated "login" | do something like search or update the directory and display the results | ldap_close() // "logout"