how to take backup of mysql database using php - php

Question

I need to export backup of the database using php when I click on the link. I searched so many references and created code. But when I execute this it displays error. Can anyone help me to get the solution? This is my code
BACKUP
Back.php
<?php
include('../database.php');
$dbhost = $_SERVER['SERVER_NAME'];
$dbuser = 'root';
$dbpass = '';
$dbname='marketing';
$backup_file = $dbname . date("Y-m-d-H-i-s") . '.gz';
$command = "mysqldump --opt -h $dbhost -u $dbuser -p $dbpass ". "$dbname | gzip > $backup_file";
$sys=system($command);
if($sys)
{
echo "succc";
}
else{
echo "failed";
}
?>

Answer 1

You may use the following code pattern directly with your task
<?php
$dbhost = $_SERVER['SERVER_NAME'];
$dbuser = 'root';
$dbpass = '';
$dbname = 'marketing';
$connection = mysqli_connect($dbhost, $dbuser, $dbpass, $dbname);
$backupAlert = '';
$tables = array();
$result = mysqli_query($connection, "SHOW TABLES");
if (!$result) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
while ($row = mysqli_fetch_row($result)) {
$tables[] = $row[0];
}
mysqli_free_result($result);
$return = '';
foreach ($tables as $table) {
$result = mysqli_query($connection, "SELECT * FROM " . $table);
if (!$result) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
$num_fields = mysqli_num_fields($result);
if (!$num_fields) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
$return .= 'DROP TABLE ' . $table . ';';
$row2 = mysqli_fetch_row(mysqli_query($connection, 'SHOW CREATE TABLE ' . $table));
if (!$row2) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
$return .= "\n\n" . $row2[1] . ";\n\n";
for ($i = 0; $i < $num_fields; $i++) {
while ($row = mysqli_fetch_row($result)) {
$return .= 'INSERT INTO ' . $table . ' VALUES(';
for ($j = 0; $j < $num_fields; $j++) {
$row[$j] = addslashes($row[$j]);
if (isset($row[$j])) {
$return .= '"' . $row[$j] . '"';
} else {
$return .= '""';
}
if ($j < $num_fields - 1) {
$return .= ',';
}
}
$return .= ");\n";
}
}
$return .= "\n\n\n";
}
$backup_file = $dbname . date("Y-m-d-H-i-s") . '.sql';
$handle = fopen("{$backup_file}", 'w+');
fwrite($handle, $return);
fclose($handle);
$backupAlert = 'Succesfully got the backup!';
}
}
}
}
echo $backupAlert;
?>

Answer 2

I use this Script as sheduled CRON task.
// Edit this section
$dbhost = "SERVER IP OR LOCALHOST";
$dbuser = "DB USER";
$dbpass = "DB PASSWORD";
$dbname = "DB NAME ";
$message = "E-MAIL MESSAGE TEXT";
// Don't need to edit below this section
function compress($filepath) {
$zip = new ZipArchive();
$file=$filepath.".zip";
if($zip->open($file,1?ZIPARCHIVE::OVERWRITE:ZIPARCHIVE::CREATE)===TRUE) {
// Add the files to the .zip file
$zip->addFile($filepath);
// Closing the zip file
$zip->close();
}
}
ini_set('date.timezone', 'Europe/Budapest');
$backupfile = $dbname.'_'.date("Y-m-d_H-i", time()).'.sql';
system("mysqldump -h $dbhost -u $dbuser -p$dbpass $dbname > $backupfile");
compress($backupfile);
// Send E-mail notification
$sendto = "NAME <E-MAIL ADDRESS>";
$sendfrom = "NAME <E-MAIL ADDRESS>";
$sendsubject = "SUBJECT";
// $message="This attachment contains the backup of your database.";
$separator = md5(time());
// attachment name
$filename = $backupfile.".zip";
// Open db file
$file = fopen( $backupfile, "r" );
// Read the file into a variable
$size = filesize($backupfile);
$content = fread( $file, $size);
//$pdfdoc is PDF generated by FPDF
$attachment = chunk_split(base64_encode(file_get_contents($filename)));
// Define the main headers.
$header = "From:$sendfrom\r\n";
$header .= "MIME-Version: 1.0\r\n";
$header .= "Content-Type: multipart/mixed; ";
$header .= "boundary=$separator\r\n";
$header .= "--$num\r\n";
// Define the message section
$header .= "Content-Type: text/plain\r\n";
$header .= "Content-Transfer-Encoding:8bit\r\n\n";
$header .= "$message\r\n";
$header .= "--$separator\r\n";
// Define the attachment section
$header .= "Content-Type: application/octet-stream; ";
$header .= "name=\"$filename\"\r\n";
$header .= "Content-Transfer-Encoding:base64\r\n";
$header .= "Content-Disposition:attachment; ";
$header .= "filename=\"$filename\"\r\n\n";
$header .= "$attachment\r\n";
$header .= "--$separator--";
// Send email now
mail( $sendto, $sendsubject, "", $header );
// Delete the SQL and ZIP file from your server
unlink($backupfile);
unlink($filename);
?>

Answer 3

If you add --verbose 2> output.txt to your command, it will spell out what is happening, line by line as below for example. Obviously you need to look at the contents of output.txt after the command.
-- Connecting to localhost...
-- Retrieving table structure for table users...
-- Sending SELECT query...
-- Retrieving rows...
-- Disconnecting from localhost...
Your full command would then be:
"mysqldump --opt -h $dbhost -u $dbuser -p $dbpass --verbose 2> output.txt". "$dbname | gzip > $backup_file"
Also it may not be correct to test $sys like you have done as an indicator of success, Instead use this form..
system ( string $command, &$return_var);
and then $return will contain the return status of the executed command (mysqldump) which is better for testing actual success of the backup.
Your code might then look like:
int $return_var;
system ($command, &$return_var);
if ($return_var ==0){
echo "success";
}
else{
echo "failed";
}

Answer 4

i changed a bit to support utf8
<title><?php echo "backup MySQL data - " . $_SERVER['SERVER_NAME'] ; ?></title>
<?php
// ref. to https://stackoverflow.com/questions/52530833/how-to-take-backup-of-mysql-database-using-php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$dbname = 'jackycms2019';
$connection = mysqli_connect($dbhost, $dbuser, $dbpass, $dbname);
mysqli_set_charset($connection,"utf8");
$backupAlert = '';
$tables = array();
$result = mysqli_query($connection, "SHOW TABLES");
if (!$result) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
while ($row = mysqli_fetch_row($result)) {
$tables[] = $row[0];
}
mysqli_free_result($result);
$return = '';
foreach ($tables as $table) {
$result = mysqli_query($connection, "SELECT * FROM " . $table);
if (!$result) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
$num_fields = mysqli_num_fields($result);
if (!$num_fields) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
$return .= 'DROP TABLE ' . $table . ';';
$row2 = mysqli_fetch_row(mysqli_query($connection, 'SHOW CREATE TABLE ' . $table));
if (!$row2) {
$backupAlert = 'Error found.<br/>ERROR : ' . mysqli_error($connection) . 'ERROR NO :' . mysqli_errno($connection);
} else {
$return .= "\n\n" . $row2[1] . ";\n\n";
for ($i = 0; $i < $num_fields; $i++) {
while ($row = mysqli_fetch_row($result)) {
$return .= 'INSERT INTO ' . $table . ' VALUES(';
for ($j = 0; $j < $num_fields; $j++) {
$row[$j] = addslashes($row[$j]);
if (isset($row[$j])) {
$return .= '"' . $row[$j] . '"';
} else {
$return .= '""';
}
if ($j < $num_fields - 1) {
$return .= ',';
}
}
$return .= ");\n";
}
}
$return .= "\n\n\n";
}
$backup_file = $dbname . '.sql';
$handle = fopen("{$backup_file}", 'w+');
fwrite($handle, $return);
fclose($handle);
$backupAlert = 'backup MySQL data completed !';
}
}
}
}
echo $backupAlert;
?>