php - A strange question about echo output -

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नीचे दिए गए कोड को देखें 

  "$ _SERVER ['HTTP_HOST']" गूंज;   
 यह 'पार्स त्रुटि' दिखाता है, जबकि अगले शो ठीक  
  $ str = $ _SERVER ['HTTP_HOST']; "$ Str" गूंज;   
 यह मेरे लिए बहुत अजीब था।   
 
 
 एक संदर्भ एक स्ट्रिंग के अंदर एसोसिएटिव सरणी, आपको या तो घुंघराले ब्रेसिज़ जोड़ना होगा या उद्धरणों को निकालना होगा: 
 दोनों  
  "{$ _SERVER ['HTTP_HOST']}"; गूंज "$ _SERVER [HTTP_HOST]";   
 काम करेगा  
 & lt; -  अत्यंत उपयोगी रीडिंग

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