第一种方法使用foreach循环

$arr = [    
    [
        'name' => 'testname1',
        'age' => 18,
    ],
    [
        'name' => 'testname2',
        'age' => 19,
    ],
    [
        'name' => 'testname3',
        'age' => 18,
    ],
];

$servername = "localhost";
$port = 3306;
$username = "username";
$password = "password";
$dbname = "mytestdb";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname, $port);

// 检测连接
if ($conn->connect_error) {
 die("connect failed: " . $conn->connect_error);
} 

$costBegin = microtime(true);

foreach($arr as $item) {
    $sql = sprintf("INSERT INTO user_info (name, age) VALUES ( '%s', %d);", $item['name'], (int)$item['age']);   
    if ($conn->query($sql) === TRUE) {
     echo "insert success";
    } else {
     echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

$costEnd = microtime(true);
$cost = round($costEnd - $costBegin, 3);
var_dump($cost);

$conn->close();

对比一下插入少量数据与插入大量数据，使用上面的for循环插入耗费的时间：

第二种使用insert合并插入

mysql里面是可以使用insert语句进行合并插入的，比如
INSERT INTO user_info (name, age) VALUES ('name1', 18), ('name2', 19);表示一次插入两条数据

$arr = [    
    [
        'name' => 'testname1',
        'age' => 18,
    ],
    [
        'name' => 'testname2',
        'age' => 19,
    ],
    [
        'name' => 'testname3',
        'age' => 18,
    ],
    // 此处省略
    ……
    ……
];

$servername = "localhost";
$port = 3306;
$username = "username";
$password = "password";
$dbname = "mytestdb";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname, $port);

// 检测连接
if ($conn->connect_error) {
 die("connect failed: " . $conn->connect_error);
} 

$costBegin = microtime(true);

if (!empty($arr)) {
    $sql = sprintf("INSERT INTO user_info (name, age) VALUES ");

    foreach($arr as $item) {
  $itemStr = '( ';
  $itemStr .= sprintf("'%s', %d", $item['name'], (int)$item['age']);
  $itemStr .= '),';
  $sql .= $itemStr;
  }

 // 去除最后一个逗号，并且加上结束分号
 $sql = rtrim($sql, ',');
 $sql .= ';';

    if ($conn->query($sql) === TRUE) {
    } else {
     echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

$costEnd = microtime(true);
$cost = round($costEnd - $costBegin, 3);
var_dump($cost);

$conn->close();

下面看一下少量数据与大量数据的时间对比。从总体时间上，可以看出insert合并插入比刚才for循环插入节约了很多时间,效果很明显

如果你觉得数组太大，想要减少sql错误的风险，也可以使用array_chunk将数组切成指定大小的块，然后对每个块进行insert合并插入.