在布尔值（xampp）上调用成员函数fetch（）

Question

Help me please. PHP returned me error 'Call to a member function fetch() on boolean'`

$sql = $pdo->prepare("select id,name,biography from authors where id=?");
$data = array($_POST['id']);
$result = $sql->execute($data);
$str=$result->fetch(PDO::FETCH_ASSOC);`

The query was made successfully because var_dump($result)=bool(true).

The same result I have with: $sql = $pdo->prepare("select id,name,biography from authors where id=:id"); $result = $sql->execute(array(':id'=>$_POST['id'])); $str=$result->fetch(PDO::FETCH_ASSOC); $sql = $pdo->prepare("select id,name,biography from authors where id=:id"); $result = $sql->execute(array(':id'=>$_POST['id'])); $str=$result->fetch(PDO::FETCH_ASSOC);

Query

$pdo->query("select id,name,biography from authors");

was made successful

Answer 1

execute() returns true or false, thats why you get the error. You should fetch results something like this:

$sql = $pdo->prepare("select id,name,biography from authors where id= ?");
$data = array($_POST['id']);
$sql->execute($data);
$str=$sql->fetch(PDO::FETCH_ASSOC);