PHP使用mysqldump命令导出数据库

PHP使用外部命令导出数据库，代码很简单，就不多废话了

<?php

  // $dumpFileName目录要有可写权限
  $DbHost = 'localhost';
$DbUser = 'root';
$DbPwd  = '123456';
$DbName = 'a';
  $fileName = $DbName . '_MySQL_data_backup_' . date('YmdHis) . '.sql';
$dumpFileName= "/var/$fileName";

header("Content-Disposition: attachment; filename=" . $fileName);
header("Content-type: application/octet-stream");
header("Pragma:no-cache"); 
header("Expires:0");
  
echo `mysqldump -h $DbHost -u$DbUser -p$DbPwd $DbName > $dumpFileName`;
  
$hd = fopen($dumpFileName, 'rb');
echo fread($hd, filesize($dumpFileName));
fclose($hd);  
?>

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