php man page for apc_exists

APC_EXISTS(3)								 1							     APC_EXISTS(3)

apc_exists - Checks if APC key exists

SYNOPSIS
       mixed apc_exists (mixed	$keys)

DESCRIPTION
	Checks if one or more APC keys exist.

PARAMETERS
	      o $keys
		- A string, or an array of strings, that contain keys.

RETURN VALUES
	Returns  TRUE  if the key exists, otherwise FALSE Or if an array was passed to $keys, then an array is returned that contains all existing
       keys, or an empty array if none exist.

EXAMPLES
       Example #1

	      apc_exists(3) example

	      <?php
	      $fruit  = 'apple';
	      $veggie = 'carrot';

	      apc_store('foo', $fruit);
	      apc_store('bar', $veggie);

	      if (apc_exists('foo')) {
		  echo "Foo exists: ";
		  echo apc_fetch('foo');
	      } else {
		  echo "Foo does not exist";
	      }

	      echo PHP_EOL;
	      if (apc_exists('baz')) {
		  echo "Baz exists.";
	      } else {
		  echo "Baz does not exist";
	      }

	      echo PHP_EOL;

	      $ret = apc_exists(array('foo', 'donotexist', 'bar'));
	      var_dump($ret);

	      ?>

	      The above example will output something similar to:

	      Foo exists: apple
	      Baz does not exist
	      array(2) {
		["foo"]=>
		bool(true)
		["bar"]=>
		bool(true)
	      }

SEE ALSO 
apc_cache_info(3), apc_fetch(3).
PHP Documentation Group 													     APC_EXISTS(3)