Resource Types
Examples
The "counter" Extension - A Continuing Example
PHP Manual

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`COUNTER_FLAG_PERSIST` (integer)
  A counter with this flag will be created as a persistent resource.
`COUNTER_FLAG_SAVE` (integer)
  A counter with this flag will be saved between invocations of PHP.
`COUNTER_FLAG_NO_OVERWRITE` (integer)
  This flag causes counter_create() to avoid overwriting an existing named counter with a new one.
`COUNTER_META_NAME` (string)
  Pass this constant to get the name of a counter resource or object.
`COUNTER_META_IS_PERISTENT` (string)
  Pass this constant to determine whether a counter resource or object is persistent (has the `COUNTER_FLAG_PERSIST` flag).
`COUNTER_RESET_NEVER` (integer)
  The counter will never be reset.
`COUNTER_RESET_PER_LOAD` (integer)
  The counter will be reset on each invocation of PHP.
`COUNTER_RESET_PER_REQUEST` (integer)
  The counter will be reset on each request.

Resource Types
Examples
The "counter" Extension - A Continuing Example
PHP Manual