html - symbol issue in php -

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is there way convert symbol – in php 

    $payment_url = "https://www.paypal.com/cgi-bin/webscr";     $currencycode = get_option('wpoupon_currency');     $countrycode = get_option('wpoupon_country');     $paypalid = get_option('wpoupon_payment_email');      $notifylink = getpermalink('&mode=notifyurl&user_id='.$current_user->id,$itemid);     $returnlink = getpermalink('&mode=returnurl',$itemid);     $cancellink = getpermalink('&mode=cancel',$itemid);      $form_custom = '';     $form_custom .= '<input type="hidden" name="cmd" value="_xclick">';     $form_custom .= '<input type="hidden" name="business" value="'. $paypalid .'">';     $form_custom .= '<input type="hidden" name="item_name" value="'. htmlspecialchars($itemname) .'">';     $form_custom .= '<input type="hidden" name="item_number" value="'. $itemid .'">';     $form_custom .= '<input type="hidden" name="amount" value="'. $itemprice .'">';     $form_custom .= '<input type="hidden" name="quantity" value="'. $quantity .'">';     $form_custom .= '<input type="hidden" name="currency_code" value="'. $currencycode .'">';     $form_custom .= '<input type="hidden" name="no_shipping" value="1">';     $form_custom .= '<input type="hidden" name="notify_url" value="'. $notifylink .'">';     $form_custom .= '<input type="hidden" name="cbt" value="return coupon!">';     $form_custom .= '<input type="hidden" name="return" value="'. $returnlink .'">';     $form_custom .= '<input type="hidden" name="rm" value="2">';     $form_custom .= '<input type="hidden" name="cancel_return" value="'. $cancellink .'">';     $form_custom .= '<input type="hidden" name="lc" value="'. $countrycode .'">';     $form_custom .= '<input type="hidden" name="bn" value="pp-buynowbf">';      echo '<form action="'. $payment_url .'" method="post" name="payment" id="payment">'. $form_custom .'</form>';

because when hidden value submitting paypal

charisma beauty – save 51% buy

is there way solve issue

so use 

$form_custom .= '<input type="hidden" name="item_name" value="'. htmlspecialchars($itemname) .'">';  showing in paypal **"charisma beauty &#8211; save 51% buy now"**

use urlencode before submitting data paypal.

$form_custom .= '<input type="hidden" name="item_name" value="'. urlencode($itemname) .'">';

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