How validate field only we entered some value into input? For example: I have form with fields: username, password and email I set 'value'=>'' in edit template for password input field When I edit this fields, I want update filed password only when I wrote some new password, but when I lost empty field password, this field will be not updated. This works, but: How validate field when only wrote into?
If field value is empty we not validate, but if field value is not empty we get rules from $validate... How do this?
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