Swapping variable values is important in sorting algorithms when you want to swap a higher value with a lower one. The usual action of variable assignment is to take the first value, put the value of this variable in a temporary variable and then assign the value of the second variable to the first one. As in the following code:
$tmp = $a;
$a = $b;
$b = $tmp;
This can be rewritten using the bitwise Xor (exclusive or) operator.
$a = $a ^ $b;
$b = $b ^ $a;
$a = $a ^ $b;
This can also be written in the shorthand notation as follows:
I was writing unit tests for a API mapping function recently and came across this interesting issue. The code I was writing tests for was in a legacy codebase that I was making changes to, and it made sense to have some unit tests in there before I started work to ensure everything worked before and after.
Embedding image within pages of content helps both within the design of the page and when shared on social media. If you set up meta tags to point at a particular image then that image will appear when the page is shared on social media. This makes your page stand out more.
Reflection is used to gather more information about code during the runtime of the program. This allows code to inspect itself and to make small modifications, which is useful in a variety of situations.