PHP integral arguments such as in curl_setopt and filter_var -


I am constantly browsing the document, but I can not seem to know that the function is an argument in which there is an int datatype I for example, in filter_var: 

  filter_var ('bob@example.com ', FILTER_VALIDATE_EMAIL);   
 ... or in curl  
  curl_setopt ($ curl, CURLOPT_URL, 'http://example.com');   
 What is FILTER_VALIDATE_EMAIL and CURLOPT_URL?   
 
 
 They are called.  
 This is just a variable, but because it is stable, it should be written as the only capital letters to separate it from other types of variables. This is the naming convention.  
  Define ('YOUR_CONSTANT', '894616466'); Echo YOUR_CONSTANT; // 894616466

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