title: Are variables used in PHP functions automatically unset after function execution?
body: <p>I have a question regarding the variables/arrays used in PHP functions. After executing the function, are all the variables automatically unset? If not, when do they unset exactly, after executing the whole PHP page? After a certain time?</p>
  
  <p>Is it useful to unset all variables used in a function at the end of the function to release from memory?</p>
  
  <p>Thank you in advance for your help and comments!</p>