PHP median Operator

 

PHP median Operator

Bitwise operations are performed in units of bit, and 0 and 1 are performed in the computer. We usually perform operations in decimal format to conform to the reading habits of ordinary people, but the computation is still expressed as 0 and 1 in the computer. Bitwise operators include the following: Bitwise operators (sorted by operator priority) Integration direction Logical operators Name Example Non-Integration ~ Non-bitwise ~ $ Left < > Move left Right Shift $ A <$ B $ A> $ B Left & Bitwise AND $ A & $ B Left ^ Bitwise OR $ A ^ $ B Left | By bit or $ A | $ B The left link in "link direction" indicates that the expression is evaluated from left to right, and the right link is opposite. In the era of logical operations, 1 represents truth, and 0 represents false. The preceding table is as follows: ~(Not by bit): reverse $ ~ $ 0 1 1 0 &(Bitwise AND): both are 1Time is 1Otherwise, the value is 0. $ $ B $ A & $ B 0 0 0 0 1 0 1 0 0 1 1 1 ^(Bitwise OR): the two values are not the same as 1., The two are the same as 0 $ $ B $ A ^ $ B 0 0 0 0 1 1 1 0 1 1 1 0 |(By bit or): one of the two is 1.It is 1.Otherwise, the value is 0. $ $ B $ A | $ B 0 0 0 0 1 1 1 0 1 1 1 1 Example: <? PHP $ A = 12; // 12 = 00001100 $ B = 3; // 3 = 00000011 Echo $ A & $ B. "<br/>"; // The displayed result is: 0. Echo $ A ^ $ B. "<br/>"; // The displayed result is: 15 Echo $ A | $ B. "<br/>"; // The displayed result is: 15 Echo $ A <$ B. "<br/>"; // The result is 96. Echo $ A >>$ B. "<br/>"; // The result is 1. Echo ~ $ A; // The displayed result is-13. ?> $ A & $ B: If both values are 1, the value is 1. Otherwise, the value is 0. Set the bits whose values are 1 in both $ A and $ B to 1; otherwise, set them to 0. 0000 1100 RMB $ & Amp; 0000 0011 RMB $ B -------------------------------------- 0000, 0000 = 0 $ A ^ $ B: the two values are not the same as 1, and the two values are the same as 0. Set the bitwise of $ A and $ B to 1 and the same bitwise to 0. 0000 1100 RMB $ ^ 0000 0011 rows $ B -------------------------------------- 0000 1111 = 15 $ A | $ B: one of the two is 1, otherwise it is 0. Set the bit where $ A or $ B is 1 to 1; otherwise, set it to 0. 0000 1100 RMB $ | 0000 0011 bytes $ B -------------------------------------- 0000 1111 = 15 $ A <$ B: Move the bits in $ A to the left for $ B (each movement represents "multiplied by 2", that is, "multiplied by 2 $ B "). 0000 1100 RMB $ <0110 0000 move three to the left, and fill in 0 for the empty location -------------------------------------- 0110 0000 = 96 $ A >> B B: Move the bits in $ A to the right $ B (each movement means "divided by 2", that is, "multiplied by 2-$ B "). 0000 1100 RMB $ <0000 0001 shifted three to the right, and the extra positions are truncated. -------------------------------------- 0000 0001 = 1 this article from: http://hi.baidu.com/e9151/blog/item/5af3fb39c5f236c5d46225ec.html/cmtid/c58cba18d6233975dbb4bd4d