php mysql 连接数据库选择显示所有表

这里主要是讲关于php中数据库连接与数据库选择以及显示当前数据库所有表三个实用函数,有需要的朋友可以看看,php实例代码如下:

<?php
$phpsql_user = "root";
$phpsql_password = "root";
$phpsql_loc = "";
$phpsql_db = "";
function phpsql_connect($location, $username, $password) {
    global $phpsql_loc, $phpsql_user, $phpsql_password;
    if ($phpsql_user != $username || $phpsql_password != $password) phpsql_error("cannot access to phpsql!(wrong username/wrong password)");
    define(phpsql_loc, $location);
    $phpsql_loc = $location;
}
function phpsql_select_db($db) {
    global $phpsql_db;
    define(phpsql_db, $db);
    $phpsql_db = $db;
}
function phpsql_list_table() {
    global $phpsql_loc, $phpsql_db;
    $i = 0;
    if (!($handle = @opendir($phpsql_loc . "/" . $phpsql_db))) return 0;
    while (($file = readdir($handle)) !== false) {
        if ($file != "." && $file != "..") {
            $table[$i++] = $file;
        }
    }
    return $table;
}