PHP define() function, run and write PHP code.

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The define() php function defines a constant. This function returns true on success or false on failure.
Syntax:
define(name,value,case_insensitive);

Example :
define () - returns true on success or false on failure.

  <?php

      define("GREETINGS","Hi to you! Nice day today?");

      echo constant("GREETINGS"); // outputs "Hi to you! Nice day today?""
    echo "<br /><br />";

      define("CONSTANT", "Hello Europe.");

      echo CONSTANT; // outputs "Hello Europe."

      echo "<br />";

      echo Constant; // outputs "Constant" and issues a notice.
    echo "<br /><br />";
    define("GREETING", "Hi to you.", true);

      echo GREETING; // outputs "Hi to you."

      echo "<br />";

      echo Greeting; // outputs "Hi to you."

      echo "<br /><br />";

      // Works as of PHP 7

      define('animals', array('Dog', 'Cat', 'Monkey'));

      echo animals[1]; // outputs "Cat"
?>

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