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This patch defines a new function and two new constants in ext/ldap:
ldap_escape()
LDAP_ESCAPE_DN
LDAP_ESCAPE_FILTER
Escaping is done according to the relevant RFCs:
http://tools.ietf.org/html/rfc1960 (FIlter)
http://tools.ietf.org/html/rfc2253 (DN)
The function also allows the user to specify a list of characters that will not be escaped.
Resolves https://bugs.php.net/bug.php?id=47607