discuz对PHP7不支持mysql的兼容性处理
PHP7 废除了 ”mysql.dll” ,推荐使用 mysqli 或者 pdo_mysql,discuz对原生mysql函数做了如下处理,通过mysqli代替原mysql函数
if(!function_exists('mysql_pconnect')){ $mysqli = mysqli_connect("$dbhost:$dbport", $dbuser, $dbpass, $dbname); function mysql_pconnect($dbhost, $dbuser, $dbpass){ global $dbport; global $dbname; global $mysqli; $mysqli = mysqli_connect("$dbhost:$dbport", $dbuser, $dbpass, $dbname); return $mysqli; } function mysql_select_db($dbname){ global $mysqli; return mysqli_select_db($mysqli,$dbname); } function mysql_fetch_array($result){ return mysqli_fetch_array($result); } function mysql_fetch_assoc($result){ return mysqli_fetch_assoc($result); } function mysql_fetch_row($result){ return mysqli_fetch_row($result); } function mysql_query($query){ global $mysqli; return mysqli_query($mysqli,$query); } function mysql_escape_string($data){ global $mysqli; return mysqli_real_escape_string($mysqli, $data); } function mysql_real_escape_string($data){ return mysql_real_escape_string($data); } function mysql_close(){ global $mysqli; return mysqli_close($mysqli); } }