pub fn clear(&mut self) {
        unsafe { zend_hash_clean(self) }
    }
Clears the hash table, removing all values.

# Example

```no_run
use ext_php_rs::types::ZendHashTable;

let mut ht = ZendHashTable::new();

ht.insert("test", "hello world");
assert_eq!(ht.is_empty(), false);

ht.clear();
assert_eq!(ht.is_empty(), true);
```
src/types/array.rs