Multiple table back up from MySQL using PHP

Question

I want to make a PHP script that will back up my selected tables from a database. From Stack Overflow I found this:

<?php 
//ENTER THE RELEVANT INFO BELOW
$mysqlUserName      = "root";
$mysqlPassword      = "";
$mysqlHostName      = "localhost";
$DbName             = "test";
$backup_name        = "mybackup.sql";
$tables             = "msc_market";

//or add 5th parameter(array) of specific tables:      array("mytable1","mytable2","mytable3") for multiple tables

Export_Database($mysqlHostName,$mysqlUserName,$mysqlPassword,$DbName,  $tables=false, $backup_name=false );

function Export_Database($host,$user,$pass,$name,  $tables=false, $backup_name=false )
{
    $mysqli = new mysqli($host,$user,$pass,$name); 
    $mysqli->select_db($name); 
    $mysqli->query("SET NAMES 'utf8'");

    $queryTables    = $mysqli->query('SHOW TABLES'); 
    while($row = $queryTables->fetch_row()) 
    { 
        $target_tables[] = $row[0]; 
    }   
    if($tables !== false) 
    { 
        $target_tables = array_intersect( $target_tables, $tables); 
    }
    foreach($target_tables as $table)
    {
        $result         =   $mysqli->query('SELECT * FROM '.$table);  
        $fields_amount  =   $result->field_count;  
        $rows_num=$mysqli->affected_rows;     
        $res            =   $mysqli->query('SHOW CREATE TABLE '.$table); 
        $TableMLine     =   $res->fetch_row();
        $content        = (!isset($content) ?  '' : $content) . "\n\n".$TableMLine[1].";\n\n";

        for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0) 
        {
            while($row = $result->fetch_row())  
            { //when started (and every after 100 command cycle):
                if ($st_counter%100 == 0 || $st_counter == 0 )  
                {
                        $content .= "\nINSERT INTO ".$table." VALUES";
                }
                $content .= "\n(";
                for($j=0; $j<$fields_amount; $j++)  
                { 
                    $row[$j] = str_replace("\n","\\n", addslashes($row[$j]) ); 
                    if (isset($row[$j]))
                    {
                        $content .= '"'.$row[$j].'"' ; 
                    }
                    else 
                    {   
                        $content .= '""';
                    }     
                    if ($j<($fields_amount-1))
                    {
                            $content.= ',';
                    }      
                }
                $content .=")";
                //every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
                if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num) 
                {   
                    $content .= ";";
                } 
                else 
                {
                    $content .= ",";
                } 
                $st_counter=$st_counter+1;
            }
        } $content .="\n\n\n";
    }
    //$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
    $backup_name = $backup_name ? $backup_name : $name.".sql";
    header('Content-Type: application/octet-stream');   
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-disposition: attachment; filename=\"".$backup_name."\"");  
    echo $content;
}
?>

Now in this code I change the $tables value for selecting a single table or more. For more than one table I put an array with table names. But the problem is that every time I get a full backup of all tables even if I change $tables value every time I get same result. How do I get only a backup of the selected tables? Please help me.

Answer 1

As seen, 5th parameter's value in Export_Database() is overridden by false value when it is called, where you need to pass array of database tables because array_intersect() can filter similar value from array parameters only. Corrected code given below...

<?php 
//ENTER THE RELEVANT INFO BELOW
$mysqlUserName      = "root";
$mysqlPassword      = "";
$mysqlHostName      = "localhost";
$DbName             = "test";
$backup_name        = "mybackup.sql";
$tables             = array("msc_market", "mytable1","mytable2","mytable3");

Export_Database($mysqlHostName,$mysqlUserName,$mysqlPassword,$DbName,  $tables, $backup_name );

function Export_Database($host,$user,$pass,$name,  $tables=false, $backup_name=false )
{
    $mysqli = new mysqli($host,$user,$pass,$name); 
    $mysqli->select_db($name); 
    $mysqli->query("SET NAMES 'utf8'");

    $queryTables    = $mysqli->query('SHOW TABLES'); 
    while($row = $queryTables->fetch_row()) 
    { 
        $target_tables[] = $row[0]; 
    }   
    if($tables !== false) 
    { 
        $target_tables = array_intersect( $target_tables, $tables); 
    }
    foreach($target_tables as $table)
    {
        $result         =   $mysqli->query('SELECT * FROM '.$table);  
        $fields_amount  =   $result->field_count;  
        $rows_num=$mysqli->affected_rows;     
        $res            =   $mysqli->query('SHOW CREATE TABLE '.$table); 
        $TableMLine     =   $res->fetch_row();
        $content        = (!isset($content) ?  '' : $content) . "\n\n".$TableMLine[1].";\n\n";

        for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0) 
        {
            while($row = $result->fetch_row())  
            { //when started (and every after 100 command cycle):
                if ($st_counter%100 == 0 || $st_counter == 0 )  
                {
                        $content .= "\nINSERT INTO ".$table." VALUES";
                }
                $content .= "\n(";
                for($j=0; $j<$fields_amount; $j++)  
                { 
                    $row[$j] = str_replace("\n","\\n", addslashes($row[$j]) ); 
                    if (isset($row[$j]))
                    {
                        $content .= '"'.$row[$j].'"' ; 
                    }
                    else 
                    {   
                        $content .= '""';
                    }     
                    if ($j<($fields_amount-1))
                    {
                            $content.= ',';
                    }      
                }
                $content .=")";
                //every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
                if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num) 
                {   
                    $content .= ";";
                } 
                else 
                {
                    $content .= ",";
                } 
                $st_counter=$st_counter+1;
            }
        } $content .="\n\n\n";
    }
    //$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
    $backup_name = $backup_name ? $backup_name : $name.".sql";
    header('Content-Type: application/octet-stream');   
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-disposition: attachment; filename=\"".$backup_name."\"");  
    echo $content;
}
?>

Answer 2

Your problem is that the array_intersect is processing the values, not the keys. Since these are one-dimensional arrays, you need to intersect the keys like this:

$target_tables = array_values(array_intersect(array_keys($target_tables), array_keys($tables)));

Explanation: Basically you're first changing the arrays into arrays of keys, then intersecting them, and then transforming it back to values.