php mysqlデータベースライブラリ全体をエクスポートしてsqlファイルを生成する具体的な実装

ネットで検索して、変更があります.
ファイル名:db_backup.php
ソースコードは次のとおりです.

 
  
ini_set("max_execution_time", "180");//       ，         。 
  
 
  
/* 
  
 
  
    ：mysql        
  
  ：    
  
  ： 
  
       mysqladmin     ，        ，       php            . 
  
        ：     :echo get_table_structure($dbname, $table, $crlf).";$crlf$crlf"; 
  
        ：     :echo get_table_content($dbname, $table, $crlf); 
  
 
  
   ：    
  
    ：2009/11/7 
  
    ：    get_table_structure，      get_table_def，               （ ：ENGINE=InnoDB AUTO_INCREMENT=80 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='        '） 
  
*/ 
  
 
  
$host="";//      
  
 
  
$dbname="";//         
  
 
  
$username="";//    
  
 
  
$passw="";//       
  
 
  
$filename=date("Y-m-d_H-i-s")."-".$dbname.".sql"; 
  
header("Content-disposition:filename=".$filename);//        
  
header("Content-type:application/octetstream"); 
  
header("Pragma:no-cache"); 
  
header("Expires:0"); 
  
 
  
//     
  
$i = 0; 
  
$crlf="\r
"; 
  
global $dbconn; 
  
$dbconn = mysql_connect($host,$username,$passw]);//     ，   ，   
  
$db = mysql_select_db($dbname,$dbconn); 
  
mysql_query("SET NAMES 'utf8'"); 
  
$tables =mysql_list_tables($dbname,$dbconn); 
  
$num_tables = @mysql_numrows($tables); 
  
print "-- filename=".$filename; 
  
while($i < $num_tables) 
  
{ 
  
$table=mysql_tablename($tables,$i); 
  
print $crlf; 
  
echo get_table_structure($dbname, $table, $crlf).";$crlf$crlf"; 
  
//echo get_table_def($dbname, $table, $crlf).";$crlf$crlf"; 
  
echo get_table_content($dbname, $table, $crlf); 
  
$i++; 
  
} 
  
 
  
/*          */ 
  
function get_table_structure($db,$table,$crlf) 
  
{ 
  
global $drop; 
  
 
  
$schema_create = ""; 
  
if(!empty($drop)){ $schema_create .= "DROP TABLE IF EXISTS `$table`;$crlf";} 
  
$result =mysql_db_query($db, "SHOW CREATE TABLE $table"); 
  
$row=mysql_fetch_array($result); 
  
$schema_create .= $crlf."-- ".$row[0].$crlf; 
  
$schema_create .= $row[1].$crlf; 
  
Return $schema_create; 
  
} 
  
 
  
/* 
  
//            ，     
  
function get_table_def($db,$table,$crlf) 
  
{ 
  
global $drop; 
  
 
  
$schema_create = ""; 
  
if(!empty($drop)) 
  
$schema_create .= "DROP TABLE IF EXISTS `$table`;$crlf"; 
  
 
  
$schema_create .= "CREATE TABLE `$table` ($crlf"; 
  
$result = mysql_db_query($db, "SHOW full FIELDS FROM $table"); 
  
while($row = mysql_fetch_array($result)) 
  
{ 
  
$schema_create .= " `$row[Field]` $row[Type]"; 
  
 
  
if(isset($row["Default"]) && (!empty($row["Default"]) || $row["Default"] == "0")) 
  
$schema_create .= " DEFAULT '$row[Default]'"; 
  
if($row["Null"] != "YES") 
  
$schema_create .= " NOT NULL"; 
  
if($row["Extra"] != "") 
  
$schema_create .= " $row[Extra]"; 
  
if($row["Comment"] != "") 
  
$schema_create .= " Comment '$row[Comment]'"; 
  
$schema_create .= ",$crlf"; 
  
} 
  
$schema_create = ereg_replace(",".$crlf."$", "", $schema_create); 
  
$result = mysql_db_query($db, "SHOW KEYS FROM $table"); 
  
while($row = mysql_fetch_array($result)) 
  
{ 
  
$kname=$row['Key_name']; 
  
if(($kname != "PRIMARY") && ($row['Non_unique'] == 0)) 
  
$kname="UNIQUE|$kname"; 
  
if(!isset($index[$kname])) 
  
$index[$kname] = array(); 
  
$index[$kname][] = $row['Column_name']; 
  
} 
  
 
  
while(list($x,$columns) = @each($index)) 
  
{ 
  
$schema_create .= ",$crlf"; 
  
if($x == "PRIMARY") 
  
$schema_create .= " PRIMARY KEY (".implode($columns,", ") . ")"; 
  
elseif (substr($x,0,6) == "UNIQUE") 
  
$schema_create .= " UNIQUE ".substr($x,7)." (" . implode($columns, ", ") . ")"; 
  
else 
  
$schema_create .= " KEY $x (" . implode($columns, ", ") . ")"; 
  
} 
  
 
  
$schema_create .= "$crlf)"; 
  
return (stripslashes($schema_create)); 
  
} 
  
*/ 
  
 
  
//      
  
function get_table_content($db, $table, $crlf) 
  
{ 
  
$schema_create = ""; 
  
$temp = ""; 
  
$result = mysql_db_query($db, "SELECT * FROM $table"); 
  
$i = 0; 
  
while($row = mysql_fetch_row($result)) 
  
{ 
  
$schema_insert = "INSERT INTO `$table` VALUES ("; 
  
for($j=0; $j{ 
  
if(!isset($row[$j])) 
  
$schema_insert .= " NULL,"; 
  
elseif($row[$j] != "") 
  
$schema_insert .= " '".addslashes($row[$j])."',"; 
  
else 
  
$schema_insert .= " '',"; 
  
} 
  
$schema_insert = ereg_replace(",$", "",$schema_insert); 
  
$schema_insert .= ");$crlf"; 
  
$temp = $temp.$schema_insert ; 
  
$i++; 
  
} 
  
return $temp; 
  
} 
  
?>