PHP Class construct with three optional parameters but one required? -


तो मूल रूप से मैं यह समझता हूं ... 

  class उपयोगकर्ता {function __construct ($ id ) {}} $ U = नया उपयोगकर्ता (); // PHP इस

की अनुमति नहीं देगा I उपयोगकर्ता को निम्न पैरामीटर में से किसी एक को देखने में सक्षम होना चाहता है, लेकिन कम से कम एक की आवश्यकता है, जबकि डिफ़ॉल्ट त्रुटि हैंडलिंग PHP यदि कोई पैरामीटर पारित नहीं होता है ... 

  वर्ग उपयोगकर्ता {फ़ंक्शन __construct ($ id = FALSE, $ email = FALSE, $ username = FALSE) {}} $ u = नया उपयोगकर्ता () ; // PHP इस

को ऐसा करने का एक तरीका है?

आप किसी विशिष्ट पैरामीटर को संबोधित करने के लिए एक सरणी का उपयोग कर सकते हैं: 

  फ़ंक्शन __construct ($ param) {$ id = null; $ ईमेल = शून्य; $ Username = null; अगर (is_int ($ परम)) {// संख्यात्मक आईडी दिया गया था $ id = $ param; } Elseif (is_array ($ param)) {यदि (isset ($ param ['id'])) {$ id = $ param ['id']; } If (isset ($ param ['email'])) {$ email = $ param ['email']; } If (isset ($ param ['username'])) {$ username = $ param ['username']; }}}

और आप इसे कैसे उपयोग कर सकते हैं: 

  // आईडी नया उपयोगकर्ता (12345); // ईमेल नए उपयोगकर्ता (सरणी ('ईमेल' = & gt; 'user@example.com')); // उपयोगकर्ता नाम नया उपयोगकर्ता (सरणी ('उपयोगकर्ता नाम' = & gt; 'जॉन डो')); // एकाधिक नए उपयोगकर्ता (सरणी ('उपयोगकर्ता नाम' = & gt; 'जॉन डो', 'ईमेल' = & gt; 'user@example.com'));

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