如何使用多個準備語句（mysql，PDO）？

Question

像這樣我的PDO語句正常工作：

$pdo = $db->prepare("UPDATE animals SET name =? WHERE id=LAST_INSERT_ID();"); 
$pdo->execute(array($name)); 

如果我使用更多的準備語句，UPDATE語句是不工作了：

$pdo = $db->prepare('INSERT INTO animals (age) values(:age)'); 
$pdo->execute(array(':age' => $_POST['age'],)); 

$pdo = $db->prepare('INSERT INTO people (name) values(:name)'); 
$pdo->execute(array(':name' => $_POST['name'],)); 

$pdo = $db->prepare("UPDATE animals SET age =? WHERE id=LAST_INSERT_ID();"); 
$pdo->execute(array($age)); 

但現在我的「更新」說法是不工作了。

Answer 1

$stmt1 = $db->prepare('INSERT INTO people (name) values(:name)'); 
$stmt1->execute(array(':name' => $_POST['name'],)); 

$stmt2 = $db->prepare("UPDATE animals SET name =? WHERE id=LAST_INSERT_ID();"); 
$stmt2->bindParams(1,$name); 
$stmt2->execute(); 

//did you now that you can do this 
//$name='newvalue'; 
//$stmt2->execute(); 
//$name='nextvalue'; 
//$stmt2->execute();