Double not (!!) operator in PHP -

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डबल नहीं ऑपरेटर PHP में क्या करता है?

उदाहरण के लिए :

<पूर्व> वापसी! $ पंक्ति;

ऊपर कोड क्या होगा?

यह नहीं है "डबल ऑपरेटर नहीं", यह नहीं ऑपरेटर दो बार लागू हुआ है सही ! एक बूलियन का परिणाम होगा, चाहे ऑपरेंड की फिर बाईं ! उस बूलियन को नकार देगा

इसका अर्थ है कि किसी भी सच्चे मान (शून्य से शून्य, गैर-खाली स्ट्रिंग्स और एरेज़ आदि) के लिए आपको बूलियन मान TRUE मिलेगा, और किसी भी गलत मान के लिए (0, 0.0, NULL , खाली स्ट्रिंग्स या खाली एरेज़) आपको बूलियन मान FALSE प्राप्त होगा।

यह एक कलाकार के लिए कार्यात्मक रूप से समतुल्य है बूलियन : 

  रिटर्न (बूल) $ पंक्ति;

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