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# ldap_compare

(PHP 4 >= 4.0.2, PHP 5)

ldap_compare -- Compare value of attribute found in entry specified with DN

## Description

mixed ldap_compare ( resource link_identifier, string dn, string attribute, string value )

Returns `TRUE` if value matches otherwise returns `FALSE`. Returns -1 on error.

ldap_compare() is used to compare value of attribute to value of same attribute in LDAP directory entry specified with dn.

The following example demonstrates how to check whether or not given password matches the one defined in DN specified entry.

Example 1. Complete example of password check
`<?php $ds=ldap_connect("localhost"); // assuming the LDAP server is on this host if ($ds) { // bind if (ldap_bind($ds)) { // prepare data $dn = "cn=Matti Meikku, ou=My Unit, o=My Company, c=FI"; $value = "secretpassword"; $attr = "password"; // compare value $r=ldap_compare($ds, $dn, $attr, $value); if ($r === -1) { echo "Error: " . ldap_error($ds); } elseif ($r === true) { echo "Password correct."; } elseif ($r === false) { echo "Wrong guess! Password incorrect."; } } else { echo "Unable to bind to LDAP server."; } ldap_close($ds); } else { echo "Unable to connect to LDAP server."; } ?>`

Warning
ldap_compare() can NOT be used to compare BINARY values!

> Note: This function was added in 4.0.2.

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