php foreach迭代对象属性数组不递增值

问题描述：

Please help! I have been staring at this for too long. I have a property of an object that is an array of objects. I want to pass in an object to a method of the parent object and search through that array property for a match, and if one is found return the index. Otherwise, I need it to return -1. For some reason, it is not iterating. If I echo out what should be the $order->product property (where the index is pointing during the loop), it is unchanging. I have dumped the array and I know it contains different values. I can show you a big var dump, but I figured I would first ask if there is a simple error or something else that is obvious to you that I have missed.

public function getItemIndex($prod) {
    if (isset($this->orders)){
      foreach($this->orders as $key => $order) {
        if ($order->product == $prod) { //if I echo this $order->product to the screen, it is unchanging
          return $key;
        } else { return -1; }
      }
    }
    else {
      return -1;
    } 
  }

If anyone has any ideas, I am open to discuss and post more information as needed. Thank you for your time.

答

You are ALWAYS returning a value on the first iteration, either the $key or -1. Try removing the else statement that you currently have. This will allow you to fully iterate over the entire array.

public function getItemIndex($prod) {
    if (isset($this->orders)){
        foreach($this->orders as $key => $order) {
            if ($order->product == $prod) { //if I echo this $order->product to the screen, it is unchanging
                return $key;
            }
        }
    }

    return -1;
}

This will ONLY return -1 once it has iterated over everything and found nothing to match. It will still return $key if it finds a match.

php foreach迭代对象属性数组不递增值

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