What does xor mean in php

Comparison Operators ». Submit a Pull Request Report a Bug. Bitwise Operators Bitwise operators allow evaluation and manipulation of specific bits within an integer. I could easily include a variable for each of them, but as always, code has a way to get unweildy pretty fast. A more intelligent approach always seems to be the answer, even if it seems to be overkill at first. Below is a simple extension called User -- which is severely truncated for clarity. Notice I am defining const variables AND methods to use them.

With the User class, you can now see how easy and intuitive bitwise flag operations become. Initially, I found bitmasking to be a confusing concept and found no use for it. Just remember to raise each value by the power of two to avoid problems. Just learning Bitwise Shift Operators. Actually, this is not an issue with the implementation of XOR, but a lot more to do with the lose-typing policy that PHP adopts. Freely switching between int and float is good for most cases, but problems happen when your value is near the word size of your machine.

Which is to say, bit machines will encounter problems with values that hover around 0x - primarily because PHP does not support unsigned integers. Here is an example for bitwise leftrotate and rightrotate.

Note that this function works only with decimal numbers - other types can be converted with pack. Perl vs. By default, Perl treats the variables as floats and PHP as integers.

I was able to verify the PHP use of the operator by stating "use integer;" within the Perl module, which output the exact same result as PHP was using. However, this will not yield the same results. After about a half hour of banging my head against the wall, I discovered a gem and wrote a function using the binary-decimal conversions in PHP.

More referencing this for myself than anything In order to get the result I expected 01 , it was necessary to AND the result with the number of bits I wanted: in this case, 2 the number 3, in decimal.

Be aware that all return values will have zeros removed from the left until they reach a bit that is set to 1. This is probably a good thing. There are plenty of good explanations of two's complement online, so I won't go into that question here. Bitwise NOT operator takes one number and inverts all bits of it.

Skip to content. Change Language. Related Articles. Table of Contents. Save Article. Improve Article. Like Article. Last Updated : 05 Dec, Next PHP Operators. Recommended Articles. Xor operator will return true for this if condition because one condition returns true.

Xor operator will return false for this if condition because both conditions return false. Xor operator will return false for this if condition because both conditions return true. The following example shows the Use of the xor operator to check the Boolean logic on numeric data. The following example shows the Use of the xor operator for bitwise operation.