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30 lines
997 B
30 lines
997 B
<?php
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/* For licensing terms, see /license.txt */
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/**
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* QuickForm rule to check if a username is available
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*/
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class HTML_QuickForm_Rule_UsernameAvailable extends HTML_QuickForm_Rule
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{
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/**
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* Function to check if a username is available
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* @see HTML_QuickForm_Rule
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* @param string $username Wanted username
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* @param string $current_username
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* @return boolean True if username is available
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*/
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public function validate($username, $current_username = null)
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{
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$user_table = Database::get_main_table(TABLE_MAIN_USER);
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$username = Database::escape_string($username);
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$current_username = Database::escape_string($current_username);
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$sql = "SELECT * FROM $user_table WHERE username = '$username'";
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if (!is_null($current_username)) {
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$sql .= " AND username != '$current_username'";
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}
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$res = Database::query($sql);
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$number = Database::num_rows($res);
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return $number == 0;
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}
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}
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