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cp6/pdo_mysql_backup.php

Last active Mar 28, 2021
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PHP PDO MySQL backup script with compression
<?php
$backup_config = array(
'DB_HOST' => '127.0.0.1',////Database hostname
'DB_NAME' => 'test_db',//Database name to backup
'DB_USERNAME' => 'root',//Database account username
'DB_PASSWORD' => '',//Database account password
'INCLUDE_DROP_TABLE' => false,//Include DROP TABLE IF EXISTS
'SAVE_DIR' => '',//Folder to save file in
'SAVE_AS' => 'test_db-',//Prepend filename
'APPEND_DATE_FORMAT' => 'Y-m-d-H-i',//Append date to file name
'TIMEZONE' => 'UTC',//Timezone for date format
'COMPRESS' => true,//Compress into gz otherwise keep as .sql
);
echo backupDB($backup_config);
function backupDB(array $config): string
{
$db = new PDO("mysql:host={$config['DB_HOST']};dbname={$config['DB_NAME']}; charset=utf8", $config['DB_USERNAME'], $config['DB_PASSWORD']);
$db->setAttribute(PDO::ATTR_ORACLE_NULLS, PDO::NULL_NATURAL);
date_default_timezone_set($config['TIMEZONE']);
$do_compress = $config['COMPRESS'];
if ($do_compress) {
$save_string = $config['SAVE_AS'] . $config['SAVE_DIR'] . date($config['APPEND_DATE_FORMAT']) . '.sql.gz';
$zp = gzopen($save_string, "a9");
} else {
$save_string = $config['SAVE_AS'] . $config['SAVE_DIR'] . date($config['APPEND_DATE_FORMAT']) . '.sql';
$handle = fopen($save_string, 'a+');
}
//array of all database field types which just take numbers
$numtypes = array('tinyint', 'smallint', 'mediumint', 'int', 'bigint', 'float', 'double', 'decimal', 'real');
$return = "";
$return .= "CREATE DATABASE `{$config['DB_NAME']}`;\n";
$return .= "USE `{$config['DB_NAME']}`;\n";
//get all tables
$pstm1 = $db->query('SHOW TABLES');
while ($row = $pstm1->fetch(PDO::FETCH_NUM)) {
$tables[] = $row[0];
}
//cycle through the table(s)
foreach ($tables as $table) {
$result = $db->query("SELECT * FROM $table");
$num_fields = $result->columnCount();
$num_rows = $result->rowCount();
if ($config['INCLUDE_DROP_TABLE']) {
$return .= 'DROP TABLE IF EXISTS `' . $table . '`;';
}
//table structure
$pstm2 = $db->query("SHOW CREATE TABLE $table");
$row2 = $pstm2->fetch(PDO::FETCH_NUM);
$ifnotexists = str_replace('CREATE TABLE', 'CREATE TABLE IF NOT EXISTS', $row2[1]);
$return .= "\n\n" . $ifnotexists . ";\n\n";
if ($do_compress) {
gzwrite($zp, $return);
} else {
fwrite($handle, $return);
}
$return = "";
//insert values
if ($num_rows) {
$return = 'INSERT INTO `' . $table . '` (';
$pstm3 = $db->query("SHOW COLUMNS FROM $table");
$count = 0;
$type = array();
while ($rows = $pstm3->fetch(PDO::FETCH_NUM)) {
if (stripos($rows[1], '(')) {
$type[$table][] = stristr($rows[1], '(', true);
} else {
$type[$table][] = $rows[1];
}
$return .= "`" . $rows[0] . "`";
$count++;
if ($count < ($pstm3->rowCount())) {
$return .= ", ";
}
}
$return .= ")" . ' VALUES';
if ($do_compress) {
gzwrite($zp, $return);
} else {
fwrite($handle, $return);
}
$return = "";
}
$counter = 0;
while ($row = $result->fetch(PDO::FETCH_NUM)) {
$return = "\n\t(";
for ($j = 0; $j < $num_fields; $j++) {
if (isset($row[$j])) {
//if number, take away "". else leave as string
if ((in_array($type[$table][$j], $numtypes)) && (!empty($row[$j]))) {
$return .= $row[$j];
} else {
$return .= $db->quote($row[$j]);
}
} else {
$return .= 'NULL';
}
if ($j < ($num_fields - 1)) {
$return .= ',';
}
}
$counter++;
if ($counter < ($result->rowCount())) {
$return .= "),";
} else {
$return .= ");";
}
if ($do_compress) {
gzwrite($zp, $return);
} else {
fwrite($handle, $return);
}
$return = "";
}
$return = "\n\n-- ------------------------------------------------ \n\n";
if ($do_compress) {
gzwrite($zp, $return);
} else {
fwrite($handle, $return);
}
$return = "";
}
$error1 = $pstm2->errorInfo();
$error2 = $pstm3->errorInfo();
$error3 = $result->errorInfo();
echo $error1[2];
echo $error2[2];
echo $error3[2];
if ($do_compress) {
gzclose($zp);
} else {
fclose($handle);
}
return "{$config['DB_NAME']} saved as $save_string";
}
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