src/Dev/Install/InstallRequirements.php
public function requireNoClasses($classNames, $testDetails)
    {
        $this->testing($testDetails);
        $badClasses = array();
        foreach ($classNames as $className) {
            if (class_exists($className)) {
                $badClasses[] = $className;
            }
        }
        if ($badClasses) {
            $message = $testDetails[2] . ".  The following classes are at fault: " . implode(', ', $badClasses);
            $this->error($testDetails, $message);
            return false;
        }
        return true;
    }
public function requireNoClasses($classNames, $testDetails)
    {
        $this->testing($testDetails);
        $badClasses = array();
        foreach ($classNames as $className) {
            if (class_exists($className)) {
                $badClasses[] = $className;
            }
        }
        if ($badClasses) {
            $message = $testDetails[2] . ".  The following classes are at fault: " . implode(', ', $badClasses);
            $this->error($testDetails, $message);
            return false;
        }
        return true;
    }
public function requireNoClasses ( $ classNames , $ testDetails ) { $ this -> testing ( $ testDetails ) ; $ badClasses = array ( ) ; foreach ( $ classNames as $ className ) { if ( class_exists ( $ className ) ) { $ badClasses [ ] = $ className ; } } if ( $ badClasses ) { $ message = $ testDetails [ 2 ] . ".  The following classes are at fault: " . implode ( ', ' , $ badClasses ) ; $ this -> error ( $ testDetails , $ message ) ; return false ; } return true ; }
Require that the given class doesn't exist

@param array $classNames
@param array $testDetails
@return bool
Require that the given class doesn t exist