How to compare file name with a string

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LEARN ABOUT PHP

defined

DEFINED(3)								 1								DEFINED(3)

defined - Checks whether a given named constant exists

SYNOPSIS

       bool defined (string  $name)

DESCRIPTION

	Checks whether the given constant exists and is defined.

       Note

	       If  you	want  to  see if a variable exists, use isset(3) as defined(3) only applies to constants. If you want to see if a function
	      exists, use function_exists(3).

PARAMETERS

	      o $name
		- The constant name.

RETURN VALUES

	Returns TRUE if the named constant given by $name has been defined, FALSE otherwise.

EXAMPLES

       Example #1

	      Checking Constants

	      <?php
	      /* Note the use of quotes, this is important.  This example is checking
	       * if the string 'TEST' is the name of a constant named TEST */
	      if (defined('TEST')) {
		  echo TEST;
	      }
	      ?>

SEE ALSO

       define(3), constant(3), get_defined_constants(3), function_exists(3), The section on Constants.

PHP Documentation Group 														DEFINED(3)

Shell Programming and Scripting