(PHP 5 >= 5.6.0, PHP 7)
ldap_escape — Escape a string for use in an LDAP filter or DN
ldap_escape ( string $value [, string $ignore = "" [, int $flags = 0 ]] ) : string
Escapes value for use in the context implied by flags.
value
The value to escape.
ignore
Characters to ignore when escaping.
flags
The context the escaped string will be used in: LDAP_ESCAPE_FILTER for filters to be used with ldap_search(), or LDAP_ESCAPE_DN for DNs. If neither flag is passed, all chars are escaped.
Returns the escaped string.
When building an LDAP filter, you should use ldap_escape with LDAP_ESCAPE_FILTER flag.
Example #1 Searching for an email address
<?php
// $ds is a valid link identifier for a directory server
// $mail is an email address provided by the user in a form
$base = "o=My Company, c=US";
$filter = "(mail=".ldap_escape($mail, "", LDAP_ESCAPE_FILTER).")";
$sr = ldap_search($ds, $base, $filter, array("sn", "givenname", "mail"));
$info = ldap_get_entries($ds, $sr);
echo $info["count"]." entries returned\n";
?>
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https://www.php.net/manual/en/function.ldap-escape.php