Send password to user instead of reset password link

You can use retrieve_password_message hook for that.

That filter is applied as this:

apply_filters( 'retrieve_password_message', string $message, string $key, string $user_login, WP_User $user_data )

So you’ll have access to $user_login of the user. It means, that you can write a filter function that will create random password for that user and then send it.

function my_reset_password_email( $message, $key, $user_login, $user_data ) {
    $user_tmp_password = wp_generate_password(12);  // it will generate pass with length of 12 characters
    wp_set_password( $user_tmp_password, $user_data->ID );

    $message = "Looks like you forgot your password!\n\n";
    $message .= "...\n";
    $message .= 'Your new temporary password: ' . $user_tmp_password . "\n\n";
    $message .= 'Kind Regards';

    return $message;
}
add_filter( 'retrieve_password_message', 'my_reset_password_email', 10, 4 );

So this will do what you wanted to, but…

I would really recommend not to use such approach. Why? Because anybody will be able to reset your password and prevent you from logging in. All I have to know to reset your password is your e-mail address. If I go to “I forgot my password” and put your email in there, your password will get changed and you’ll get email with new one. But if that email goes to spam and you go to the site, you won’t be able to log in and you won’t know why…

Also it’s a very, very bad idea to send passwords in emails and you should never do this.

And if you really, really have to, then at least force user to change his password after first logging in.

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