位运算符用于对操作数执行位级操作。运算符首先转换为位级，然后对操作数执行计算。可以在位级别执行加法、减法、乘法等数学运算，以加快处理速度。在PHP中，在位级别工作的运算符有：
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- &（按位和）： 这是一个二进制运算符，即它在两个操作数上工作。PHP中的按位AND运算符将两个数字作为操作数，并对两个数字的每一位进行AND运算。只有当两位都为1时，AND的结果才为1。
语法 :
$First & $Second This will return another number whose bits are set if both the bit of first and second are set.
例子：
Input: $First = 5, $Second = 3 Output: The bitwise & of both these value will be 1. Explanation: Binary representation of 5 is 0101 and 3 is 0011. Therefore their bitwise & will be 0001 (i.e. set if both first and second have their bit set.)
- |（按位或）： 这也是一个二进制运算符，即对两个操作数起作用。按位OR运算符将两个数作为操作数，并对两个数的每一位执行OR。或的结果是1，两位中的任何一位都是1。
语法 :
$First | $Second This will return another number whose bits are set if either the bit of first or second are set.
例子：
Input: First = 5, Second = 3 Output: The bitwise | of both these value will be 7. Explanation: Binary representation of 5 is 0101 and 3 is 0011. Therefore their bitwise | will be 0111 (i.e. set if either first or second have their bit set.)
- ^（按位异或）： 这也是一个二进制运算符，即对两个操作数起作用。这也被称为异或运算符。按位异或将两个数字作为操作数，并对两个数字的每一位进行异或。如果两位不同，则异或的结果为1。
语法 :
$First ^ $Second This will return another number whose bits are set if one of the bit in first or second is set but not both.
例子：
Input: First = 5, Second = 3 Output: The bitwise ^ of both these value will be 6. Explanation: Binary representation of 5 is 0101 and 3 is 0011. Therefore their bitwise ^ will be 0110 (i.e. set if either first or second have their bit set but not both.)
- ~（按位不） ：这是一个一元运算符，即只作用于一个操作数。按位NOT运算符取一个数字并将其所有位反转。
语法 :
~$number This will invert all the bits of $number.
例子：
Input: number = 5 Output: The bitwise '~' of this number will be -6. Explanation: Binary representation of 5 is 0101. Therefore the bitwise ~ of this will be 1010 (inverts all the bits of the input number)
- < 这是一个二进制运算符，即工作在两个操作数上。按位左移位运算符接受两个数字，左移位第一个操作数的位，第二个操作数决定移位的位数。
语法 :
$First << $Second This will shift the bits of $First towards the left. $Second decides the number of time the bits will be shifted.
例子：
Input: First = 5, Second = 1 Output: The bitwise << of both these value will be 10. Explanation: Binary representation of 5 is 0101 . Therefore, bitwise << will shift the bits of 5 one times towards the left (i.e. 01010 )
注： 一位的按位左移相当于2的乘法。
- >>（按位右移）： 这也是一个二进制运算符，即对两个操作数起作用。按位右移运算符接受两个数字，第一个操作数的位右移，第二个操作数决定要移位的位数。
语法 :
$First >> $Second This will shift the bits of $First towards the right. $Second decides the number of time the bits will be shifted.
例子：
Input: First = 5, Second = 1 Output: The bitwise >> of both these value will be 2. Explanation: Binary representation of 5 is 0101 . Therefore, bitwise >> will shift the bits of 5 one times towards the right(i.e. 010)
注： 按位右移一位相当于2除。
以下是PHP中按位运算符的实现：
<?php // PHP code to demonstrate Bitwise Operator. // Bitwise AND $First = 5; $second = 3; $answer = $First & $second ; print_r( "Bitwise & of 5 and 3 is $answer" ); print_r( "" ); // Bitwise OR $answer = $First | $second ; print_r( "Bitwise | of 5 and 3 is $answer" ); print_r( "" ); // Bitwise XOR $answer = $First ^ $second ; print_r( "Bitwise ^ of 5 and 3 is $answer" ); print_r( "" ); // Bitwise NOT $answer = ~ $First ; print_r( "Bitwise ~ of 5 is $answer" ); print_r( "" ); // Bitwise Left shift $second = 1; $answer = $First << $second ; print_r( "5 << 1 will be $answer" ); print_r( "" ); // Bitwise Right shift $answer = $First >> $second ; print_r( "5 >> 1 will be $answer" ); print_r( "" ); ?> |
输出：
Bitwise & of 5 and 3 is 1 Bitwise | of 5 and 3 is 7 Bitwise ^ of 5 and 3 is 6 Bitwise ~ of 5 is -6 5 << 1 will be 10 5 >> 1 will be 2
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