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我使用名爲form_mods_form_alter的函數構建了一個改變窗體的模塊。 我想只允許jpg，jpeg，png文件類型。我所擁有的不是驗證。這是允許gif，我不想讓gif。使用hook_form_alter的文件附件擴展Drupal file_validate_extensions
<?php
function form_mods_form_alter($form, $form_state, $form_id) {
// Ad form
if($form_id == 'ad_node_form'){
$form['attachments']['wrapper']['new']['upload']['#description'] = 'BBGI test The maximum upload size is 1 MB. Only files with the following extensions may be uploaded: jpg jpeg png.';
$form['attachments']['wrapper']['new']['upload']['#ahah']['#upload_validators']['file_validate_extensions'][0] = 'png jpg jpeg';
}
}
?>
這是我用print_r（$ form）得到的;
[attachments] => Array
(
[#type] => fieldset
[#access] => 1
[#title] => File attachments
[#collapsible] => 1
[#collapsed] => 1
[#description] => Changes made to the attachments are not permanent until you save this post. The first "listed" file will be included in RSS feeds.
[#prefix] =>
[#suffix] =>
[#weight] => 30
[wrapper] => Array
(
[#prefix] =>
[#suffix] =>
[#theme] => upload_form_new
[#cache] => 1
[new] => Array
(
[#weight] => 10
[upload] => Array
(
[#type] => file
[#title] => Attach new file
[#size] => 40
[#description] => BBGI test The maximum upload size is 1 MB. Only files with the following extensions may be uploaded: jpg jpeg png.
[#ahah] => Array
(
[#upload_validators] => Array
(
[file_validate_extensions] => Array
(
[0] => png jpg jpeg
)
)
)
)
[attach] => Array
(
[#type] => submit
[#value] => Attach
[#name] => attach
[#ahah] => Array
(
[path] => upload/js
[wrapper] => attach-wrapper
[progress] => Array
(
[type] => bar
[message] => Please wait...
)
[#upload_validators] => Array
(
[file_validate_extensions] => Array
(
[0] => png jpg jpeg
)
)
)
[#submit] => Array
(
[0] => node_form_submit_build_node
)
)
)
)
)
這裏的一個常見缺陷是隻測試從管理（用戶1）帳戶，爲[file_validate_extensions]（http://api.drupal.org/api/drupal/includes--file。 inc/function/file_validate_extensions/6）跳過該用戶的驗證。 –