由网上搜到，有更改。
文件名：db_backup.php
源代码如下：
复制代码代码如下:php
/*程序功能：mysql数据库备份功能作者：唐小刚
说明：
本程序主要是从mysqladmin中提取出来，并作出一定的调整，希望对大家在用php编程时备份数据有一定帮助.
如果不要备份结构：请屏掉这句:echo get_table_structure($dbname, $table, $crlf).";$crlf$crlf";如果不要备份内容：请屏掉这句:echo get_table_content($dbname, $table, $crlf);修改者：何锦盛修改时间：2009/11/7修改内容：新增函数get_table_structure，注释掉了函数get_table_def，目的是获得更丰富的建表时的细节（如：ENGINE=InnoDB AUTO_INCREMENT=80 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci COMMENT='商品信息变更信息'）
*/$host="";//数据库地址$dbname="";//这里配置数据库名$username="";//用户名$passw="";//这里配置密码$filename=date("Y-m-d_H-i-s")."-".$dbname.".sql";header("Content-disposition:filename=".$filename);//所保存的文件名header("Content-type:application/octetstream");header("Pragma:no-cache");header("Expires:0");//备份数据$i = 0;$crlf="\r\n";global $dbconn;$dbconn = mysql_connect($host,$username,$passw]);//数据库主机，用户名，密码$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($i {$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++;}/*新增的获得详细表结构*/ 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 $schema_create;}/*//原来别人的取得数据库结构，但不完整function get_table_def($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($schema_create));}*///获得表内容function get_table_content($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;}?>