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Function parameters are declared after the function name and inside parentheses. They are declared much like a typical variable would be -

Syntax:

<?php
   // multiply a value by 5 and return it to the caller
   function multiply ($value) {
      $value = $value * 5;
      return $value;
   }
   
   $retval = multiply (10);
   Print "Return value is $retval\n";
?>

Output:

This will produce the following result

Return value is 50

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