How to convert Hashtable to array

This looks a lot like XML, which is why you could use PHP's SimpleXML extension:

$hash = '<hashtable>
  <entry>
    <string>actiontypedesc</string>
    <string>Deletion of IP Address [148.56.25.133] from Child Nameserver ns4.pankajwelcome.com</string
>
  </entry>
  <entry>
    <string>entityid</string>
    <string>61389936</string>
  </entry>
  <entry>
    <string>actionstatus</string>
    <string>Success</string>
  </entry>
</hashtable>';

$asXML = new SimpleXMLElement($hash);
var_dump($asXML);

This creates an object and you can easily access its fields.

A generic conversion will not provide the best result. XML is a data structure, a generic conversion usually results in the loss of information and functionality.

If you like to read this specific data into a simple array, you can use DOM+XPath:

$document = new DOMDocument();
$document->loadXml($xml);
$xpath = new DOMXpath($document);

$array = [];
foreach ($xpath->evaluate('/hashtable/entry') as $entry) {
  $key = $xpath->evaluate('string(string[1])', $entry);
  $value = $xpath->evaluate('string(string[2])', $entry);
  $array[$key] = $value;
}

var_dump($array);

Output:

array(3) {
  ["actiontypedesc"]=>
  string(82) "Deletion of IP Address [148.56.25.133] from Child Nameserver ns4.pankajwelcome.com"
  ["entityid"]=>
  string(8) "61389936"
  ["actionstatus"]=>
  string(7) "Success"
}

/hashtable/entry returns a list of all entry nodes. string[1] would return the first string element child node (in a list), but the function string() casts it into a string.