Yii2 : Require at least one of the two fields - yii2

Question

One of the two phone numbers phone_parent or phone_students must be provided AND they must be an integer. When combined, only atLeastValidator works, when I leave it out, the integer works. Out of ideas. Any hint?
[['phone_parent', 'phone_student'], 'integer'],
['phone_student', AtLeastValidator::class, 'in' => ['phone_student', 'phone_parent']],
['phone_parent', AtLeastValidator::class, 'in' => ['phone_student', 'phone_parent']],
update: I've just discovered that integer works when I try to submit (no request is sent yet, I remain on form page); However it should work on focus out - just like all the other validators; It's an instance of ActiveForm.

Answer 1

I don't think you need to have that custom AtLeastValidator, you can use when and whenClient in the following way to work the way you want.
Your rules should look like below
[
['phone_parent'],
'required',
'when' => function ($model) {
return ($model->phone_student == '');
},
'whenClient' => 'function(attribute,value){
return ($("#testform-phone_student").val()=="");
}',
'message' => 'Either Parent or Student Phone must be filled',
],
[
['phone_student'],
'required',
'when' => function ($model) {
return ($model->phone_parent == '');
},
'whenClient' => 'function(attribute,value){
return ($("#testform-phone_parent").val()=="");
}',
'message' => 'Either Parent or Student Phone must be filled',
],
[['phone_parent', 'phone_student'], 'integer'],
Above all i would use a regular expression in order to validate the phone number to be valid rather than just using integer that will allow 0 as a pone number or mobile number which isnt valid. using match validator with a regex in the pattern will make it solid.