apc_exists(3) [php man page]

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)

APC_CAS(3)								 1								APC_CAS(3)

apc_cas - Updates an old value with a new value

SYNOPSIS

       bool apc_cas (string  $key, int	$old, int  $new)

DESCRIPTION

       apc_cas(3)  updates  an	already existing integer value if the $old parameter matches the currently stored value with the value of the $new
       parameter.

PARAMETERS

	      o $key
		- The key of the value being updated.

	      o $old
		- The old value (the value currently stored).

	      o $new
		- The new value to update to.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      apc_cas(3) example

	      <?php
	      apc_store('foobar', 2);
	      echo '$foobar = 2', PHP_EOL;
	      echo '$foobar == 1 ? 2 : 1 = ', (apc_cas('foobar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;
	      echo '$foobar == 2 ? 1 : 2 = ', (apc_cas('foobar', 2, 1) ? 'ok' : 'fail'), PHP_EOL;

	      echo '$foobar = ', apc_fetch('foobar'), PHP_EOL;

	      echo '$f__bar == 1 ? 2 : 1 = ', (apc_cas('f__bar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;

	      apc_store('perfection', 'xyz');
	      echo '$perfection == 2 ? 1 : 2 = ', (apc_cas('perfection', 2, 1) ? 'ok' : 'epic fail'), PHP_EOL;

	      echo '$foobar = ', apc_fetch('foobar'), PHP_EOL;
	      ?>

	      The above example will output something similar to:

	      $foobar = 2
	      $foobar == 1 ? 2 : 1 = fail
	      $foobar == 2 ? 1 : 2 = ok
	      $foobar = 1
	      $f__bar == 1 ? 2 : 1 = fail
	      $perfection == 2 ? 1 : 2 = epic fail
	      $foobar = 1

SEE ALSO 
apc_dec(3), apc_store(3).
PHP Documentation Group 														APC_CAS(3)