memory_get_peak_usage() is always available in PHP >= 5.2.7.

Author: sebastianbergmann

PHPUnit/TextUI/ResultPrinter.php

@@ -340,21 +340,15 @@ protected function printHeader($timeElapsed)
             );
         }
 
-        if (function_exists('memory_get_peak_usage')) {
-            $memory = sprintf(
-              ', Memory: %4.2fMb',
-              memory_get_peak_usage(TRUE) / 1048576
-            );
-        } else {
-            $memory = '';
-        }
-
         $this->write(
           sprintf(
             "%sTime: %s%s\n\n",
             $this->verbose ? "\n" : "\n\n",
             $timeElapsed,
-            $memory
+            sprintf(
+              ', Memory: %4.2fMb',
+              memory_get_peak_usage(TRUE) / 1048576
+            )
           )
         );
     }