我必须检查ArrayCollection中是否已存在Email实体,但我必须将电子邮件检查为字符串(实体包含ID以及与其他entites的某些关系,因此我使用单独的表来保留所有电子邮件).
现在,在第一次我写了这段代码:
/** * A new Email is adding: check if it already exists. * * In a normal scenario we should use $this->emails->contains(). * But it is possible the email comes from the setPrimaryEmail method. * In this case,the object is created from scratch and so it is possible it contains a string email that is * already present but that is not recognizable as the Email object that contains it is created from scratch. * * So we hav to compare Email by Email the string value to check if it already exists: if it exists,then we use * the already present Email object,instead we can persist the new one securely. * * @var Email $existentEmail */ foreach ($this->emails as $existentEmail) { if ($existentEmail->getEmail()->getEmail() === $email->getEmail()) { // If the two email compared as strings are equals,set the passed email as the already existent one. $email = $existentEmail; } }
但是阅读ArrayCollection类我看到了方法exists
,这似乎是我做同样事情的一种更加优雅的方式.
但我不知道如何使用它:有人可以解释我如何使用这个方法给出上面的代码?
当然,在PHP中,Closure是一个简单的
Anonymous functions.您可以重写您的代码如下:
$exists = $this->emails->exists(function($key,$element) use ($email){ return $email->getEmail() === $element->getEmail()->getEmail(); } );
希望这有帮助
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