HealthBoost.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class HealthBoost : MonoBehaviour
{
	//public Animator anim;
	public GameObject player;
	public GameObject healthItem;
	public PlayerHealth ph;
	public Slider hs;

	void OnTriggerEnter (Collider other)
	{
		if(other.tag == "Player")
		{
			if (ph.currentHealth > 50) {
				ph.currentHealth = 100;
				hs.value = ph.currentHealth;
			} 
			else 
			{
				ph.currentHealth += 50;
				hs.value = ph.currentHealth;
			}

			Destroy (healthItem);
		}
	}
}