<?php
 
function MysqlError()
{
        if (mysql_errno())
        {
                echo "<b>Mysql Error: " . mysql_error() . "</b>\n";
        }
}
 
$username = "root";
$password = "";
$db = "database";
$host = "localhost";
 
$target_charset = "utf8";
$target_collate = "utf8_general_ci";
 
echo "<pre>";
 
$conn = mysql_connect($host, $username, $password);
mysql_select_db($db, $conn);
 
$tabs = array();
$res = mysql_query("SHOW TABLES");
MysqlError();
while (($row = mysql_fetch_row($res)) != null)
{
        $tabs[] = $row[0];
}
 
// now, fix tables
foreach ($tabs as $tab)
{
        $res = mysql_query("show index from {$tab}");
        MysqlError();
        $indicies = array();
 
        while (($row = mysql_fetch_array($res)) != null)
        {
                if ($row[2] != "PRIMARY")
                {
                        $indicies[] = array("name" => $row[2], "unique" => !($row[1] == "1"), "col" => $row[4]);
                        mysql_query("ALTER TABLE {$tab} DROP INDEX {$row[2]}");
                        MysqlError();
                        echo "Dropped index {$row[2]}. Unique: {$row[1]}\n";
                }
        }
 
        $res = mysql_query("DESCRIBE {$tab}");
        MysqlError();
        while (($row = mysql_fetch_array($res)) != null)
        {
                $name = $row[0];
                $type = $row[1];
                $set = false;
                if (preg_match("/^varchar\((\d+)\)$/i", $type, $mat))
                {
                        $size = $mat[1];
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} VARBINARY({$size})");
                        MysqlError();
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} VARCHAR({$size}) CHARACTER SET {$target_charset}");
                        MysqlError();
                        $set = true;
 
                        echo "Altered field {$name} on {$tab} from type {$type}\n";
                }
                else if (!strcasecmp($type, "CHAR"))
                {
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} BINARY(1)");
                        MysqlError();
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} VARCHAR(1) CHARACTER SET {$target_charset}");
                        MysqlError();
                        $set = true;
 
                        echo "Altered field {$name} on {$tab} from type {$type}\n";
                }
                else if (!strcasecmp($type, "TINYTEXT"))
                {
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} TINYBLOB");
                        MysqlError();
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} TINYTEXT CHARACTER SET {$target_charset}");
                        MysqlError();
                        $set = true;
 
                        echo "Altered field {$name} on {$tab} from type {$type}\n";
                }
                else if (!strcasecmp($type, "MEDIUMTEXT"))
                {
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} MEDIUMBLOB");
                        MysqlError();
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} MEDIUMTEXT CHARACTER SET {$target_charset}");
                        MysqlError();
                        $set = true;
 
                        echo "Altered field {$name} on {$tab} from type {$type}\n";
                }
                else if (!strcasecmp($type, "LONGTEXT"))
                {
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} LONGBLOB");
                        MysqlError();
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} LONGTEXT CHARACTER SET {$target_charset}");
                        MysqlError();
                        $set = true;
 
                        echo "Altered field {$name} on {$tab} from type {$type}\n";
                }
                else if (!strcasecmp($type, "TEXT"))
                {
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} BLOB");
                        MysqlError();
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} TEXT CHARACTER SET {$target_charset}");
                        MysqlError();
                        $set = true;
 
                        echo "Altered field {$name} on {$tab} from type {$type}\n";
                }
 
                if ($set)
                        mysql_query("ALTER TABLE {$tab} MODIFY {$name} COLLATE {$target_collate}");
        }
 
        // re-build indicies..
        foreach ($indicies as $index)
        {
                if ($index["unique"])
                {
                        mysql_query("CREATE UNIQUE INDEX {$index["name"]} ON {$tab} ({$index["col"]})");
                        MysqlError();
                }
                else
                {
                        mysql_query("CREATE INDEX {$index["name"]} ON {$tab} ({$index["col"]})");
                        MysqlError();
                }
 
                echo "Created index {$index["name"]} on {$tab}. Unique: {$index["unique"]}\n";
        }
 
        // set default collate
        mysql_query("ALTER TABLE {$tab}  DEFAULT CHARACTER SET {$target_charset} COLLATE {$target_collate}");
}
 
// set database charset
mysql_query("ALTER DATABASE {$db} DEFAULT CHARACTER SET {$target_charset} COLLATE {$target_collate}");
 
mysql_close($conn);
echo "</pre>";