使用PHP從MySQL備份多個表格

Question

我想製作一個PHP腳本來備份數據庫中的所選表格。從堆棧溢出，我發現這一點：

<?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; 
} 
?> 

現在，在這個代碼更改我選擇一個表或多個$表值。對於多個表，我把一個數組與表名。但問題是每次我得到所有表的全部備份時，即使我每次獲得相同的結果時都更改了$表的值。我如何獲得所選表格的備份？請幫幫我。

Answer 1

如圖所示，調用Export_Database（）時，第5個參數的值被false值覆蓋，因爲array_intersect（）只能從數組參數中過濾相似的值。更正後的代碼如下...

<?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

您的問題是array_intersect正在處理的值，而不是密鑰。由於這些都是一維數組，你需要交的鑰匙是這樣的：

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

說明： 基本上你第一次改變陣列成鍵的陣列，然後交叉它們，然後將其轉化回價值。