How does the Zend Framework form get the reason for IsValid failure?

Hi,all.
I have the following code

$formContent->isValid($_POST){    //pass }

How do I get the wrong information when the validation fails at this time?

Reply content:

Hi,all.
I have the following code

$formContent->isValid($_POST){    //pass }

How do I get the wrong information when the validation fails at this time?

Fix

The element of HTML was deleted by WHO. Led to the absence of that name, which caused the failure to see the name err in err, causing the tragedy to happen ~

