make a cost of repair all item

error: "Call to a member function getDamage() on array" (EXCEPTION) in "plugins/.../repair/Repair" at line 63


CODE:

case "fixall":
if (!($sender instanceof Player)) {
$sender->sendMessage("Run this command ingame.");
return true;
}
$item = $sender->getInventory()->getContents();
$cost = (int)($this->getConfig()->get("cost")) * $sender->getInventory()->getContents()->getDamage();
$eco = EconomyAPI::getInstance();
if ($eco->myMoney($sender) < $cost) {
$sender->sendMessage("• §cNot enough money. ($cost)");
return true;
}else if (!isset(self::$pending[$sender->getName()]) || self::$pending[$sender->getName()] < time()) {
self::$pending[$sender->getName()] = time() + 10;
$sender->sendMessage("• §eAre you sure to repair all item? This will cost you §c" . $eco->getMonetaryUnit() . $cost . "§e. Type §c/fix§e again to confirm.");
return true;
}else {
unset(self::$pending[$sender->getName()]);
$eco->reduceMoney($sender, $cost);
foreach($sender->getInventory()->getContents() as $index => $item){
if($item->getDamage() > 0){
$sender->getInventory()->setItem($index, $item->setDamage(0));
}
}
foreach($sender->getArmorInventory()->getContents() as $index => $item){
if($item->getDamage() > 0){
$sender->getArmorInventory()->setItem($index, $item->setDamage(0));
}
}
$sender->sendMessage("• §aDone. §c(-" . $eco->getMonetaryUnit() . $cost . ")");
}
return true;

 

The error is pretty self explanatory. What do you expect

PHP:

$sender->getInventory()->getContents()->getDamage();


to return?

 

damaged total of inventory

 

$totaldamage = 0;
foreach($sender->getInventory()->getContents() as $index => $item){
if(($damage = $item->getDamage()) > 0){
$totaldamage = $totaldamage + $damage;
}
$cost = (configcost) * $totaldamage;

 

thanks