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class Example {
  public function firstMethod($parameter) {
      // logic here
      $this->secondMethod($parameter);
  }

  public function secondMethod($parameter) {
      // logic here
  }
}

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class Example {
  public function firstMethod($parameter) {
      if ($this->instance) {
          $this->secondMethod($parameter);
      }
  }

  public function secondMethod($parameter) {
      // logic here
  }
}

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class Example {
  public function firstMethod($parameter) {
      try {
          $this->secondMethod($parameter);
      } catch (Exception $e) { 
           // handle exception              
      }
  }

  public function secondMethod($parameter) {
      // logic here
  }
}

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class Example {

  protected $dependency;

  public function __construct(Dependency $dependency) {
      $this->dependency = $dependency;
  }

  public function firstMethod() {
      $this->dependency->doSomething();
  }
}

$dependencyInstance = new Dependency;

$exampleInstance = new Example($dependencyInstance);
$exampleInstance->firstMethod();

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