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The ldap_set_rebind_proc function in PHP is used to set a callback function that will be called whenever a rebind is needed during an LDAP session.

A rebind is required when the original connection credentials expire or change, and the LDAP server requests the client to authenticate again.

Here is an example usage of ldap_set_rebind_proc:

php
// Define the callback function
function my_rebind_callback($ldap, $dn, $password){
// Perform any necessary actions to refresh the connection credentials
// e.g., get new username and password, or renew the existing ones

// Re-authenticate with the LDAP server
ldap_bind($ldap, $dn, $password);

// You can also do additional operations after rebind if needed
// e.g., updating the user's access permissions

// Return true on success, or false on failure
return true;
}

// Set the callback function
// Pass the function name or an anonymous function as the callback
ldap_set_rebind_proc($ldap, "my_rebind_callback");

// Now, any rebind request from the LDAP server will trigger the callback function
// The callback function is responsible for refreshing the connection credentials and re-authenticating with the LDAP server.


In the example above, the my_rebind_callback function receives the LDAP connection, the distinguished name (DN), and the password as parameters. Within the callback, you can perform any necessary actions to renew the connection credentials, such as fetching new username and password from a secure source or renewing existing credentials. Then, you re-authenticate with the LDAP server using ldap_bind. Finally, you can perform additional operations if needed, like updating the user's access permissions.

Remember to return true on success or false if the rebind fails.

This callback function will be called by the LDAP extension whenever a rebind is required, allowing you to seamlessly refresh the connection credentials and continue the LDAP operation.