Zend\Code\Generator\ClassGenerator::hasMethod PHP Method

    public function hasMethod($methodName)
    {
        return isset($this->methods[strtolower($methodName)]);
    }

 /**
  * @inherit Zend\Code\Generator\GeneratorInterface
  */
 public function generate()
 {
     $output = '';
     $indent = $this->getIndentation();
     $traits = $this->getTraits();
     if (empty($traits)) {
         return $output;
     }
     $output .= $indent . 'use ' . implode(', ', $traits);
     $aliases = $this->getTraitAliases();
     $overrides = $this->getTraitOverrides();
     if (empty($aliases) && empty($overrides)) {
         $output .= ";" . self::LINE_FEED . self::LINE_FEED;
         return $output;
     }
     $output .= ' {' . self::LINE_FEED;
     foreach ($aliases as $method => $alias) {
         $visibility = null !== $alias['visibility'] ? current(Reflection::getModifierNames($alias['visibility'])) . ' ' : '';
         // validation check
         if ($this->classGenerator->hasMethod($alias['alias'])) {
             throw new Exception\RuntimeException(sprintf('Generation Error: Aliased method %s already exists on this class', $alias['alias']));
         }
         $output .= $indent . $indent . $method . ' as ' . $visibility . $alias['alias'] . ';' . self::LINE_FEED;
     }
     foreach ($overrides as $method => $insteadofTraits) {
         foreach ($insteadofTraits as $insteadofTrait) {
             $output .= $indent . $indent . $method . ' insteadof ' . $insteadofTrait . ';' . self::LINE_FEED;
         }
     }
     $output .= self::LINE_FEED . $indent . '}' . self::LINE_FEED . self::LINE_FEED;
     return $output;
 }