PDO errorinfo not returns info - php

Question

I have code:
$stmt = $db->prepare(" bla bla ");
$stmt->execute();
print_r($db->errorInfo());
This returns: Array ( [0] => 00000 [1] => [2] => )
Why not returned error info ?

Answer 1

The following reports the error correctly:
$dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
if (($stmt = $dbh->prepare(" bla bla ")) === false) {
print_r($dbh->errorInfo());
}
if ($stmt->execute() === false) {
print_r($stmt->errorInfo());
}
Note in the above that parse errors caused during prepare() are reported against $dbh. Whereas even if the prepare() succeeds, then execute() may cause an error, but that error is reported against $stmt.
In the test above, I got the error report immediately after the 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 'bla bla' at line 1
)
But this behavior changes if you use emulated prepares.
When you enable that attribute, the prepare() is virtually a no-op. It just saves the query string in the $stmt, and then the actual prepare of the statement is delayed until you call execute(). So the error, if any, is reported against $stmt whether it happens at prepare time or at execute time.
I tested changing the error-reporting line as follows:
$dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
// prepare won't report SQL errors, it's virtually a no-op.
if (($stmt = $dbh->prepare(" bla bla ")) === false) {
print_r($dbh->errorInfo());
}
// execute will report errors of parsing or execution.
if ($stmt->execute() === false) {
print_r($stmt->errorInfo());
}
In this case, no error was reported at prepare(), and but I got the same error as above at execute(). Again, you must examine $stmt to get the error after execute().

Answer 2

SQLSTATE 00000 means "Success". Per the PHP documentation:
If the SQLSTATE error code is not set or there is no driver-specific error, the elements following element 0 will be set to NULL.