CakePHP 3. Validation of uploaded file extension

问题

I am using CakePHP 3. I have the upload field and want to permit uploading only .pdf and .doc(x) files. How can I add that properties to the following validator?

$validator
   ->notEmpty('article');

回答1:

Simply add the extension rule in your validation which is define in http://api.cakephp.org/3.0/class-Cake.Validation.Validation.html

extension( string|array $check , array $extensions ['gif', 'jpeg', 'png', 'jpg'] )

example:

$validator
            ->allowEmpty('profile_image')
            ->add('profile_image', [
                'validExtension' => [
                    'rule' => ['extension',['png']], // default  ['gif', 'jpeg', 'png', 'jpg']
                    'message' => __('These files extension are allowed: .png')
                ]
    ]);

回答2:

You have to add rule to your validator:

$validator
        ->notEmpty('avatar', __('Please enter your cute picture'))
        ->requirePresence('avatar', 'create')
        ->add('avatar', 'validFormat', [
            'rule' => ['custom', '([^\s]+(\.(?i)(pdf|doc|docx))$)'], 
            'message' => __('These files extension are allowed: .pdf, .doc, .docx')
        ]);

回答3:

Using allowEmpty('profile_image') might give you some issues since it's a field of type 'file'.

Maybe you better look at the uploadedFile rule with optional true parameter.

来源：https://stackoverflow.com/questions/33432934/cakephp-3-validation-of-uploaded-file-extension