Not understanding php code -

-

इस कोड 32 का आउटपुट क्यों है? 

  & lt;? Php $ a = 4 & lt; & lt; 2 + 1; प्रतिध्वन करें $ a; ? & Gt;    
 
 
 अंकगणित php में bitwise ऑपरेटरों पर पूर्वता है।  
 के रूप में परिणामस्वरूप, 1 + 2 पहले क्रियान्वित किया जाता है।  
 4 & lt; & lt; (1 + 2)  
 ==  
 4 & lt; & lt; 3  
 ==  
 2 ** 2 & lt; & lt; 3  
 ==  
 2 ** 5  
 ==  
 32  
।

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