Need help in reading XML data

<po-response xsi:schemaLocation="http://seller.xxxxxxx.xxx.com/xx/xx https://seller.xxxxxxx.xxx.com/xx/xx-v2.xsd">
−
<purchase-order>
<po-number>55555</po-number>
<po-date>2011-01-27</po-date>
<expected-ship-date>2011-01-31</expected-ship-date>
−
<shipping-detail>
<ship-to-name>John Smith</ship-to-name>
<address>123 SUNRISE AVE NY</address>
<city>NEW YORK</city>
<state>NY</state>
<zipcode>98311</zipcode>
<phone>11111111</phone>
<shipping-method>Ground</shipping-method>
</shipping-detail>
<customer-name>John Smith</customer-name>
−
<po-line>
−
<po-line-header>
<line-number>1</line-number>
<item-id>cC-W2W61</item-id>
<item-name>Fabric - XXXXXX</item-name>
<item-sell-price>14.99</item-sell-price>
<order-quantity>1</order-quantity>
</po-line-header>
−
<po-line-detail>
<po-line-status>NEW</po-line-status>
<quantity>1</quantity>

Code (markup):

Can you please help me in reading values from this XML file

I am trying using following code.

$str = "https://www.example.com/xml/";
	$output = file_get_contents($str);
	$xmlOBJ = simplexml_load_string($output);
$ord_no = (string) $xmlOBJ->purchase-order->po-number;

PHP:

getting this error
syntax error, unexpected T_OBJECT_OPERATOR, expecting ',' or ';'

Can you please help me getting vaule "55555"

 

It should be

$ord_no = (string) $xmlOBJ->{"purchase-order"}->{"po-number"};

PHP:

you cannot use sign "-" in property name.

 

Thanks Greg Carnegie. It worked. Rep added