LDAP_COMPARE(3) 1 LDAP_COMPARE(3)ldap_compare - Compare value of attribute found in entry specified with DNSYNOPSIS
mixed ldap_compare (resource $link_identifier, string $dn, string $attribute, string $value)
DESCRIPTION
Compare $value of $attribute with value of same attribute in an LDAP directory entry.
PARAMETERS
o $link_identifier
- An LDAP link identifier, returned by ldap_connect(3).
o $dn
- The distinguished name of an LDAP entity.
o $attribute
- The attribute name.
o $value
- The compared value.
RETURN VALUES
Returns TRUE if $value matches otherwise returns FALSE. Returns -1 on error.
EXAMPLES
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.";
}
?>
NOTES
Warning
ldap_compare(3) can NOT be used to compare BINARY values!
PHP Documentation Group LDAP_COMPARE(3)
Check Out this Related Man Page
LDAP_COMPARE(3) Library Functions Manual LDAP_COMPARE(3)NAME
ldap_compare, ldap_compare_s - Perform an LDAP compare operation
SYNOPSIS
#include <ldap.h>
int ldap_compare_s(ld, dn, attr, value)
LDAP *ld;
char *dn, *attr, *value;
int ldap_compare(ld, dn, attr, value)
LDAP *ld;
char *dn, *attr, *value;
DESCRIPTION
The ldap_compare_s() routine is used to perform an LDAP compare operation synchronously. It takes dn, the DN of the entry upon which to
perform the compare, and attr and value, the attribute type and value to compare to those found in the entry. It returns an LDAP error
code, which will be LDAP_COMPARE_TRUE if the entry contains the attribute value and LDAP_COMPARE_FALSE if it does not. Otherwise, some
error code is returned.
The ldap_compare() routine is used to perform an LDAP compare operation asynchronously. It takes the same parameters as ldap_compare_s(),
but returns the message id of the request it initiated. The result of the compare can be obtained by a subsequent call to ldap_result(3).
ERRORS
ldap_compare_s() returns an LDAP error code which can be interpreted by calling one of ldap_perror(3) and friends. ldap_compare() returns
-1 if something went wrong initiating the request. It returns the non-negative message id of the request if things went ok.
BUGS
There is no way to compare binary values, but there should be.
SEE ALSO ldap(3), ldap_error(3)ACKNOWLEDGEMENTS
OpenLDAP is developed and maintained by The OpenLDAP Project (http://www.openldap.org/). OpenLDAP is derived from University of Michigan
LDAP 3.3 Release.
OpenLDAP 2.0.27-Release 22 September 1998 LDAP_COMPARE(3)
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