# Error ‘php.exe’ is not recognized as an internal or external command when calling phpunit on Windows XP/Vista/7

This may be caused by the PHP_PEAR_PHP_BIN environment variable not being set correctly.

To fix this go to Advanced System Settings in Control Panel/System & Maintenance/System.

Select Environment Variables.

Find variable PHP_PEAR_PHP_BIN and change the value from ./php.exe to the correct path\to\php.exe on your system.

# Reference the next sibling node in a SimpleXMLElement object in PHP

To reference the next sibling nodes in a SimpleXMLElement object in PHP you can use the xpath axes “following-sibling” as shown below:

$nextSibling =$element->xpath("following-sibling::ElementName");

To reference the first sibling following the element:

$firstSiblingElement =$nextSibling[0];

Reference: XPath Axes