我使用PHP 7.1.23測試了以下代碼：

$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES,true);

$sth = $pdo->prepare('select now() and this is a bad sql where a - b from c');

if ($sth === false) {

echo "error on prepare()\n";

print_r($pdo->errorInfo());

}

if ($sth->execute() === false) {

echo "error on execute()\n";

print_r($sth->errorInfo());

}

error on execute()

Array

(

[0] => 42000

[1] => 1064

[2] => You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near 'a bad sql where a - b from c' at line 1

)

然后,我測試了相同的代碼,除非禁用了仿真的prepare：

$pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES,false);

error on prepare()

Array

(

[0] => 42000

[1] => 1064

[2] => You have an error in your sql Syntax; check the manual that corresponds to your MysqL server version for the right Syntax to use near 'a bad sql where a - b from c' at line 1

)

Fatal error: Uncaught Error: Call to a member function execute() on boolean

故事的道德啟示：

>使用模擬的準備好的語句時,prepare()是空操作,并且錯誤會延遲到execute()為止.我建議禁用模擬的prepare,除非您使用的數據庫不支持prepared語句(我不知道任何RDBMS產品的任何當前版本都不能執行真正的prepared語句).

>在prepare()上檢查錯誤時,請使用$pdo-> errorInfo().

>在execute()上檢查錯誤時,請使用$stmt-> errorInfo().

總結

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