How save custom meta type posts multicheck grouped by taxonomy (with CMB2) [closed]

The same way you would in any other HTML form

<input type="text" name="name[]" />
<input type="text" name="email[]" />

<input type="text" name="name[]" />
<input type="text" name="email[]" />

<input type="text" name="name[]" />
<input type="text" name="email[]" />

The above will give you arrays instead of singular values in PHP, so $_POST[‘name’] is an array of 3 values.

The same is true of your checkboxes, give them all the same name with a [] on the end. Use post IDs as their values, and you have your data structure, a simple array of post IDs

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