PHP Unset() vs Unlink() Function
PHP unset( ) is an inbuilt function mainly used to unset a specified variable. The function of that variable depends upon various factors. Suppose a certain function is called inside of a user-declared function. In that case, it will unset the variable associated value and leave the value initiated outside, which means the function can only unset local variables. Still, we have to $ GLOBAL array to unset global targets to perform the task.
Although both the PHP unlink( ) function and the unset( ) functions are used for undo operations, there is a vast difference between the situation where we have to implement those as both operate differently. The unset( ) function is mostly used when we want to make a certain file empty by only deleting the contents of the file, not the complete file, whereas the unlink( ) function is used in a situation when we need to completely delete a whole file not just the content of the file.
PHP Unlink( ) Function
The unlink( ) function is a PHP inbuilt function, which is mostly used when we have to delete a certain file, not only the content completely.
The unlink( ) function holds two parameters, the filename of the file which has to be eradicated is set in this parameter, and the function reads the parameter. After completing the operation, it either returns a TRUE on successful file deletion or a FALSE if it faces any error while deleting the same file.
PHP Unlike() function has the following syntax:
The above code output is:
PHP Unset( ) Function
The unset( ) function is a PHP inbuilt function, which is mostly used when we only have to delete certain content of a file, not the entire file, i.e., it helps the developer clear the content of a file.
The unlink( ) function holds only a single parameter, the $ variable, which is the context that will be used as unset and cleared from the files. The function reads the parameter, and after completing the operation, it does not return any value.
PHP Unset() function follows this syntax:
The above code gives the following output.
The value of variable ' $ variable ' before the unset ( ) function - - - > Hello world ! ! ! ! ! The value of variable ' $ variable ' after the unset ( ) function - - - >
Difference between Unlink() and Unset() Function
Below are some major differences between Unlike() and Unset() function.