Predefined Constants in PHP

  •  __FILE__ The name of the script file being parsed. 
  •  __LINE__ The number of the line in the script being parsed. 
  •  PHP_VERSION The version of PHP in use. 
  •  PHP_OS The operating system using PHP.

echo "<br>This file is ".__FILE__;
echo "<br>This is line number ".__LINE__;
echo "<br>I am using ".PHP_VERSION;
echo "<br>This test is being run on ".PHP_OS;

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