How to verify if GET exists

Question

So  I have some PHP code that looks a bit like this    lt body gt      The ID is        lt  php     echo   GET  id                gt    lt  body gt    Now  when I pass an ID like http   localhost myphp php id 26 it works alright  but if there is no ID like just http   localhost myphp php then it outputs   The ID is Notice  Undefined index  id in C  xampp htdocs myphp php on line 9     I have searched for a way to fix this but I cannot find any way to check if a URL variable exists  I know there must be a way though

User · Answer

You are use PHP isset  Example   if  isset   GET  id           echo   GET  id

User · Answer

You can use the array key exists   built-in function   if  array key exists  id     GET         echo   GET  id        or the isset   built-in function   if  isset   GET  id           echo   GET  id

User · Answer

Normally it is quite good to do   echo isset   GET  id        GET  id      wtf     This is so when assigning the var to other variables you can do defaults all in one breath instead of constantly using if statements to just give them a default value if they are not set

User · Answer

if  isset   GET  id                do stuff

User · Answer

Please try it   if isset   GET  id     amp  amp   empty   GET  id         echo   GET  id

User · Answer

Use and empty   whit negation  for test if not empty   if  empty   GET  id              if get id is not empty

User · Answer

You can use isset function  if isset   GET  id              id index exists    You can create a handy function to return default value if index doesn t exist  function Get  index   defaultValue        return isset   GET  index       GET  index     defaultValue        prints  quot invalid id quot  if   GET  id   is not set echo Get  id    invalid id     You can also try to validate it at the same time  function GetInt  index   defaultValue        return isset   GET  index    amp  amp  ctype digit   GET  index                  int   GET  index                  defaultValue        prints 0 if   GET  id   is not set or is not numeric echo GetInt  id   0

[php] How to verify if $_GET exists?

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