PHP Base bit operations

PHP bit arithmetic

$a & $b and (bitwise AND)

$a | $b or (bitwise OR)

$a ^ $b Xor (Bitwise XOR)

~ $a not (bitwise non)

$a << $b shift left

$a >> $b shift right

Detailed

$a & $b Bitwise and set the bit to 1 in both $ A and $b to 1;

Example: & 12 = 8

10 1010

12 1100

1000 8

$a | $b bitwise OR put a $ A or $b in one of 1 for the set to 1;

Example: 10 | 12 = 14

10 1010

12 1100

1110 14

$a ^ $b Bitwise XOR OR

Example: 10 ^ 12

10 1010

12 1100

0110 6

~a is set to 0 for the 0 of the per-digit

Example: ~ =

10 1010 1111111111111111111111111111111111111111111111111111111111110101-11

$a << $b left move the $b of $ A to the left (each move represents a multiply by 2);

Example: 1 << 10 = 1024

1 (1) shift left 10 bit 10000000000 (1024)

Equivalent to the 1*2 10 times, PHP is not a power operation is really depressed.

$a >> $b Right Move the $b in $ A to the right (each move is represented by 2);

Example: 1024x768 << 2 = 1256

10000000000 (1024) Shift right 2 bits is 100000000 (256)

PHP for Operation $ A & $b and (bitwise VS) $a | $b or (bitwise OR) $a ^ $b Xor (Bitwise XOR) ~ $a not (bitwise non) $a << $b shift left $a >> $b shift right

Detailed $ A & $b bitwise set to 1 for Bits 1 in $ A and $b; Example: & 12 = 810 101012 1100 1000 8

$a | $b bitwise OR put a $ A or $b in one of 1 for the set to 1; Example: 10 | 12 = 1410 101012 1100 1110 14

$a ^ $b Bitwise XOR: 10 ^ 1210 101012 1100 0110 6

~a is set to 0 for the 0 of the per-bit non-set of $ A: ~ = 10 1010 1111111111111111111111111111111111111111111111111111111111110101-11

$a << $b left move the $b in $ A to the left (each move is multiplied by 2), for example: 1 << 10 = 10241 (1) Shift left 10 bits 10000000000 (1024) is equivalent to 1*2 10 times, PHP is not a power operation is really depressed.

$a >> $b Right Move the $b in $ A to the right (each move is represented by 2); For example: 2 << 2 = 125610000000000 (1024) Right-shift to the left-hand side is 100000000 (256)

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