本文介绍了Drupal表单API的工作原理，包括如何生成HTML并安全处理提交的表单数据。通过三个阶段：验证(validation)、提交(submission)及重定向(redirection)，确保了整个表单流程的安全性和有效性。
Drupal Form API
Drupal’s form engine takes care of generating HTML for the forms to be displayed and securely processing submitted forms using three phases: validation, submission, and redirection.
[b]validation function[/b]
form_id plus _validate
[b]submit function[/b]
form_id plus _submit
[b]Alter form before it's built[/b]
form_id plus _alter
hook_form_alter
Drupal’s form engine takes care of generating HTML for the forms to be displayed and securely processing submitted forms using three phases: validation, submission, and redirection.
//identify the form
$form_id
//describing form
$form
//contains form info
$form_state
[b]validation function[/b]
form_id plus _validate
[b]submit function[/b]
form_id plus _submit
[b]Alter form before it's built[/b]
form_id plus _alter
hook_form_alter
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