如何使用PHP进行数据备份和恢复

<?php
// 获取所有表
$tables = array();
$result = $conn->query("SHOW TABLES");
while ($row = $result->fetch_array()) {
    $tables[] = $row[0];
}

// 循环备份每个表
foreach ($tables as $table) {
    $result = $conn->query("SELECT * FROM " . $table);
    $num_fields = $result->field_count;

    $content .= 'DROP TABLE IF EXISTS ' . $table . ';';
    $row2 = $conn->query("SHOW CREATE TABLE " . $table)->fetch_row();
    $content .= "

" . $row2[1] . ";

";

    for ($i = 0; $i < $num_fields; $i++) {
        while ($row = $result->fetch_row()) {
            $content .= "INSERT INTO " . $table . " VALUES(";
            for ($j = 0; $j < $num_fields; $j++) {
                $row[$j] = addslashes($row[$j]);
                if (isset($row[$j])) {
                    $content .= '"' . $row[$j] . '"';
                } else {
                    $content .= '""';
                }
                if ($j < ($num_fields - 1)) {
                    $content .= ',';
                }
            }
            $content .= ");
";
        }
    }
    $content .= "

";
}

// 将数据写入备份文件
$file_name = "backup_" . date("Y-m-d") . ".sql";
$handle = fopen($file_name, 'w+');
fwrite($handle, $content);
fclose($handle);

echo "备份成功！备份文件名：".$file_name;

<?php
$file_name = "backup_file.sql";

$sql_content = file_get_contents($file_name);
$sql_array = explode(";
", $sql_content);

foreach ($sql_array as $sql) {
    if (trim($sql) != "") {
        $result = $conn->query($sql);
        if (!$result) {
            echo "恢复失败, SQL语句：".$sql;
        }
    }
}

echo "恢复成功！";