Curl cannot post data to php page

It took a while to figure it out - but the code below should repeat the results after searching based on your original request from William Smith as an attorney. Hope this makes sense ...

            define('ROOT','c:/wwwroot');
            $url_base='https://www.clarkcountycourts.us';
            $url_login=$url_base.'/Anonymous/Login.aspx?ReturnUrl=/Anonymous/default.aspx';
            $url_start=$url_base.'/Anonymous/default.aspx';
            $url_search=$url_base.'/Anonymous/Search.aspx?ID=200&NodeID=101,103,104,105,500,600,601,602,603,604,605,606,607,608,609,610,611,612,613,614,615,616,617,618,619,699,700,701,702,703,704,705,706,707,708,709,710,711,712,713,714,715,716,717,718,719,720,721,722,723,724,725,726,727,728,729,730,731,797,798&NodeDesc=All%20Courts';
            $cookiejar=tempnam( sys_get_temp_dir(), 'cookiejar_' );

            $lastname='smith';
            $firstname='william';

            $formparams=array(
                '__VIEWSTATEGENERATOR',
                '__EVENTVALIDATION',
                '__EVENTTARGET',
                '__EVENTARGUMENT',
                '__VIEWSTATE'
            );
            $stdparams=array(
                'SearchBy' => '2',
                'AttorneySearchMode' => 'Name',
                'LastName' => $lastname,
                'FirstName' => $firstname,
                'MiddleName' => '',
                'CaseStatusType' => '0',
                'SortBy' => 'fileddate',
                'DateFiledOnAfter' => '',
                'DateFiledOnBefore' => '',                  
                'SearchSubmit' => 'Search',
                'CaseSearchMode' => 'CaseNumber',
                'CaseSearchValue' => '',
                'CitationSearchValue' => '',
                'CourtCaseSearchValue' => '',
                'PartySearchMode' => 'Name',
                'cboState' => 'AA',
                'DateOfBirth' => '',
                'DriverLicNum' => '',
                'chkCriminal' => 'on',
                'chkFamily' => 'on',
                'chkCivil' => 'on',
                'chkProbate' => 'on',
                'chkDtRangeCriminal' => 'on',
                'chkDtRangeFamily' => 'on',
                'chkDtRangeCivil' => 'on',
                'chkDtRangeProbate' => 'on',
                'chkCriminalMagist' => 'on',
                'chkFamilyMagist' => 'on',
                'chkCivilMagist' => 'on',
                'chkProbateMagist' => 'on',
                'DateSettingOnAfter' => '',
                'DateSettingOnBefore' => '',
                'SearchType' => 'PARTY',
                'SearchMode' => 'NAME',
                'NameTypeKy' => 'ALIAS',
                'BaseConnKy' => 'AT',
                'StatusType' => 'true',
                'ShowInactive' => '',
                'AllStatusTypes' => 'true',
                'CaseCategories' => '',
                'RequireFirstName' => 'False',
                'CaseTypeIDs' => '',
                'HearingTypeIDs' => ''
            );
            /* A fudge I know, manually build this param - I think it might be constructed using javascript on submission */
            $stdparams['SearchParams']='SearchBy~~Search+By:~~Attorney~~Attorney||AttorneyNameOption~~Party+Search+Mode:~~Name~~Name||LastName~~Last+Name:~~'.$lastname.'~~'.$lastname.'||FirstName~~First+Name:~~'.$firstname.'~~'.$firstname.'||AllOption~~Case+Status:~~0~~All||selectSortBy~~Sort+By:~~Filed+Date~~Filed+Date ';




            /* Initialise curl and set basic options */
            $curl=curl_init();
            if( parse_url( $url_base,PHP_URL_SCHEME )=='https' ){
                curl_setopt( $curl, CURLOPT_SSL_VERIFYHOST, 2 );
                curl_setopt( $curl, CURLOPT_SSL_VERIFYPEER, false );
                curl_setopt( $curl, CURLOPT_CAINFO, realpath( ROOT . '/cacert.pem' ) );
            }
            curl_setopt( $curl, CURLINFO_HEADER_OUT, true );
            curl_setopt( $curl, CURLOPT_RETURNTRANSFER, true );
            curl_setopt( $curl, CURLOPT_FOLLOWLOCATION, true );
            curl_setopt( $curl, CURLOPT_AUTOREFERER, true );
            curl_setopt( $curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0' );
            curl_setopt( $curl, CURLOPT_HTTPHEADER, array('Host: '.parse_url( $url_login,PHP_URL_HOST ),'Connection: keep-alive') );


            /* Stage 1 - Get initial page to obtain session cookies etc and store in cookiejar...mmmmm, cookies! */
            curl_setopt( $curl, CURLOPT_URL, $url_login );
            curl_setopt( $curl, CURLOPT_COOKIEJAR, $cookiejar );
            curl_setopt( $curl, CURLOPT_COOKIESESSION, true );
            $res=curl_exec( $curl );



            /* Step 2 - GET form page and analyse input elements */
            curl_setopt( $curl, CURLOPT_URL, $url_search );
            curl_setopt( $curl, CURLOPT_AUTOREFERER, true );
            curl_setopt( $curl, CURLOPT_COOKIEFILE, $cookiejar );
            curl_setopt( $curl, CURLOPT_COOKIESESSION, false );
            $res=curl_exec( $curl );



            /* utility class that simplifies getting DOMDocument with error checking etc */
            $dom=new htmldom( $res );
            $html=$dom->gethtml();
            $col=$html->getElementsByTagName('input');

            /* we need to know values for specific fields - add to array of params to be submitted */
            foreach( $col as $index => $node ){
                if( in_array( $node->getAttribute('name'), $formparams ) ) {
                    $stdparams[ $node->getAttribute('name') ]=$node->getAttribute('value');
                }
            }
            /* Not sure how the 'SearchParams' field value is calculated so calculated manually above..... */




            /* Stage 3 - POST */
            /* Prepare search query */
            $info=$res='';
            $querystring=http_build_query( $stdparams, '', '&' );
            curl_setopt( $curl, CURLOPT_URL, $url_search );
            curl_setopt( $curl, CURLOPT_REFERER, $url_search );
            curl_setopt( $curl, CURLOPT_COOKIEFILE, $cookiejar );
            curl_setopt( $curl, CURLOPT_COOKIESESSION, false );
            curl_setopt( $curl, CURLOPT_POST, true );
            curl_setopt( $curl, CURLOPT_POSTFIELDS, $querystring );
            $res=curl_exec( $curl );
            $info=curl_getinfo( $curl );


            /* The final search results - you could manipulate the dom to get specific items if you wished */
            echo '<pre>';
            print_r( $res );
            echo '</pre>';

            /* Close curl */
            curl_close( $curl );

      

        
        
        
      

    

For completeness, the above utility class.

class htmldom{
    private $html;
    public function __construct( $data=false, $convert=true ){
        try{
            if( !$data ) return false;
            libxml_use_internal_errors( true );
            $this->html = new DOMDocument('1.0','utf-8');
            $this->html->validateOnParse=false;
            $this->html->standalone=true;
            $this->html->preserveWhiteSpace=true;
            $this->html->strictErrorChecking=false;
            $this->html->substituteEntities=false;
            $this->html->recover=true;
            $this->html->formatOutput=false;

            $this->html->loadHTML( $convert ? mb_convert_encoding( $data, 'utf-8' ) : $data );

            $parse_errs=serialize( libxml_get_last_error() );
            libxml_clear_errors();

        }catch( Exception $e ){
            die( $e->getMessage() );    
        }
    }
    public function gethtml(){
        return $this->html;
    }
}