(PHP 4 >= 4.0.2, PHP 5, PHP 7)
ldap_compare — Compare value of attribute found in entry specified with DN
ldap_compare ( resource $ldap , string $dn , string $attribute , string $value [, array|null $controls = null ] ) : bool|int
Compare value of attribute with value of same attribute in an LDAP directory entry.
ldap
An LDAP link identifier, returned by ldap_connect().
dn
The distinguished name of an LDAP entity.
attribute
The attribute name.
value
The compared value.
controls
Array of LDAP Controls to send with the request.
Returns true if value matches otherwise returns false. Returns -1 on error.
| Version | Description |
|---|---|
| 8.0.0 | controls is nullable now; previously, it defaulted to []. |
| 7.3 | Support for controls added |
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.";
}
?> ldap_compare() can NOT be used to compare BINARY values!
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https://www.php.net/manual/en/function.ldap-compare.php