使用PHP从MySQL备份多个表格

Question

我想制作一个PHP脚本来备份数据库中的所选表格。从堆栈溢出，我发现这一点：

<?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; 
} 
?> 

现在，在这个代码更改我选择一个表或多个$表值。对于多个表，我把一个数组与表名。但问题是每次我得到所有表的全部备份时，即使我每次获得相同的结果时都更改了$表的值。我如何获得所选表格的备份？请帮帮我。

Answer 1

如图所示，调用Export_Database（）时，第5个参数的值被false值覆盖，因为array_intersect（）只能从数组参数中过滤相似的值。更正后的代码如下...

<?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

您的问题是array_intersect正在处理的值，而不是密钥。由于这些都是一维数组，你需要交的钥匙是这样的：

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

说明： 基本上你第一次改变阵列成键的阵列，然后交叉它们，然后将其转化回价值。