How can we determine whether a variable is set?

  • isset() function
  • empty() function
  • is_null() function
  • is_set() function
In PHP, the isset() function is used to determine whether a variable is set and not null. It returns true if the variable is set and has a non-null value, and false otherwise. Learn more: http://php.net/manual/en/function.isset.php
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