How to change a user’s role?

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See the WP_User class, you can use this to add and remove roles for a user.

EDIT: I really should have provided more information with this answer initially, so i’m adding more information below.

More specifically, a user’s role can be set by creating an instance of the WP_user class, and calling the add_role() or remove_role() methods.

Example

Change a subscribers role to editor

// NOTE: Of course change 3 to the appropriate user ID
$u = new WP_User( 3 );

// Remove role
$u->remove_role( 'subscriber' );

// Add role
$u->add_role( 'editor' );

Hopefully that’s more helpful than my initial response, which wasn’t necessarily as helpful.

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