How to determine whether a variable is set in PHP

• You can use isset() method to determine whether a variable is set.
• Returns true if variable exists, false otherwise.

Syntax

Bool isset(mixed $var[,mixed $var…])

Example

</php
$str = “Hello World”;
If(isset($str))
{
  echo “variable is set.”;
}
else
{
  echo “variable is not set.”;
}
?>