EDIT

<?php

if(empty($_ENV['LD_LIBRARY_PATH'])){

  print('environment variable "LD_LIBRARY_PATH" should contain the path to the php executables.');

  exit(-1);

}

$php_bin= $_ENV['LD_LIBRARY_PATH'];

// assemble the required command arguments for to be delegated to phpunit

// we have to skip the first arguemnt since this is containing this very

// script!

$args = $GLOBALS['argv'];

array_shift($args);

$arg_str = implode(' ', $args);

// execute phpunit, we are using here the backtick operator:

// see http://php.net/manual/language.operators.execution.php

$execute = `$php_bin/phpunit $arg_str`;

echo $execute;