unlink() Function:

• This function is used for file system handling.
• It deletes the file used in context. For example:

unlink('demo.txt');

The above line will delete the file unlink completely.

• It includes two parameters: filename which is required parameter and the other is context which is optional parameter.
• It will return true on success else returns false.
• Syntax: unlink(filename,context)

unset() Function:

• This function is used for variable management.
• It undefined a variable.

<?php  
$demo='hello';  
echo 'Before using unset() value of $demo is : '. $demo.'<br>';  
unset($demo);  
echo 'After using unset() the value of $demo is : '. $demo;  
?>  

The above code will give the following output:

Before using unset() value of $demo is : hello
After using unset() the value of $demo is :

• It includes one more parameter which are the variables names.
• It does not return any value.
• Syntax: unset(var1, var2,.......);