php7.4对低版本的mysql内置函数的兼容支持 对一些低版本运行的php程序改造或许会有些用哦//--高版本的mysql支持 $dbhost = DB_HOST; $dbport = 3306; $dbuser = DB_USER; $dbpass = DB_PASSWD; $dbname = DB_NAME; if(!function_exists('mysql_connect')){ function mysql_connect($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); } function mysql_num_rows($result){ return mysqli_num_rows($result); } function mysql_num_fields($result){ return mysqli_num_fields($result); } function mysql_insert_id(){ global $mysqli; return $mysqli->insert_id; } function mysql_error(){ global $mysqli; return mysqli_error($mysqli); } function mysql_errno(){ global $mysqli; return mysqli_errno($mysqli); } function mysql_affected_rows(){ global $mysqli; return mysqli_affected_rows($mysqli); } function mysql_get_server_info(){ global $mysqli; return mysqli_get_server_info($mysqli); } define('MYSQL_ASSOC',0); }