Description:
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From manual page: https://php.net/function.ldap-count-entries
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When you forget to provide the first argument to ldap_count_entries (i.e. the link to the LDAP connection), it returns NULL instead of FALSE.

As per documentation and consistency with other LDAP functions, it should return FALSE to indicate an error.

Test script:
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$ldapLink = ldap_connect('localhost');

ldap_set_option($ldapLink, LDAP_OPT_PROTOCOL_VERSION, 3);

$memberBase = "ou=members,dc=feministwiki,dc=org";
$userDN = "cn=testuser,$memberBase";
$newUsername = 'whatever';

ldap_bind($ldapLink, $userDN, '[REDACTED]');

$result = ldap_search($ldapLink, $memberBase, 'cn=$newUsername', array());

var_dump(ldap_count_entries($result)); # First argument missing.

Expected result:
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The function should return FALSE to indicate an error, as per documentation and consistency with other LDAP functions.

Actual result:
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The function returns NULL.