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problem in isset_par() function in sign up code

kindly explain a little bit what is isset_par() function in this code

if (isset_par('task')) {

    if (!get_par('first_name') || !get_par('last_name') ||

        !get_par('street_addr') || !get_par('state') ||

        !get_par('postal_code') || !get_par('city') ||

        !get_par('country') || !get_par('phone') ||

        !get_par('email') || !get_par('payment_currency') ||

        !get_par('i_time_zone')) {

        $ok = false;


given in this link

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1 Comment

Yes, there seems to be a couple referenced library files.  Could you please add documentation for where these files can be found.

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