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Definition and Usage. The unset () function unsets a variable. Syntax. unset ( variable, .... ); Parameter Values. Technical Details. PHP Variable Handling Reference. W3schools Pathfinder. Track your progress - it's free! Log in Sign Up.
unset () destroys the specified variables. The behavior of unset () inside of a function can vary depending on what type of variable you are attempting to destroy. If a globalized variable is unset () inside of a function, only the local variable is destroyed.
Learn how to delete specific fields in MongoDB documents using the $unset operator.
Apr 9, 2018 · In this article, we will discuss freeing the memory with unset() and using NULL value to any variable. unset(): The unset() function is an inbuilt function in PHP that is used to unset a specified variable.
unset($a); echo "The value of variable 'a' after unset: " . $a; ?> </body> </html> The value of variable 'a' before unset: Hello world! The value of variable 'a' after unset:
Deleting Multiple Array Elements. If you want to delete multiple array elements and don’t want to call unset() or array_splice() multiple times you can use the functions array_diff() or array_diff_key() depending on whether you know the values or the keys of the elements to remove from the array.
Definition and Usage. The function unset () destroys the specified variables. The behavior of unset () inside of a function can vary depending on what type of variable you are attempting to destroy. If a globalized variable is unset () inside of a function, only the local variable is destroyed.
The PHP documentation states the following about the unset() language construct: destroys the specified variables. Unset a given variable. What does this really mean? Just destroy the variable content; empty out a variable and give it the value null? Or does it mean, wipe out the variable not just it's content but everything? I wrote the following:
References Explained. Change language: Unsetting References ¶. When you unset the reference, you just break the binding between variable name and variable content. This does not mean that variable content will be destroyed. For example: <?php. $a = 1; $b =& $a; unset($a); . ?> won't unset $b, just $a.
unset() destroys the specified variables. The behavior of unset() inside of a function can vary depending on what type of variable you are attempting to destroy. If a globalized variable is unset() inside of a function, only the local variable is destroyed.
