# apd_set_session_trace

(PECL apd 0.2-0.4)

apd_set_session_trace — Starts the session debugging

### Description

apd_set_session_trace ( int `$debug_level` [, string `$dump_directory` = ini_get("apd.dumpdir") ] ) : void

Starts debugging to apd_dump_{process_id} in the dump directory.

### Parameters

`debug_level`

  An integer which is formed by adding together the XXX_TRACE constants.

  It is not recommended to use `MEMORY_TRACE`. It is very slow and does not appear to be accurate. `ASSIGNMENT_TRACE` is not implemented yet.

  To turn on all functional traces (TIMING, FUNCTIONS, ARGS SUMMARY (like strace -c)) use the value 99

`dump_directory`

  The directory in which the profile dump file is written. If not set, the apd.dumpdir setting from the php.ini file is used.

### Return Values

No value is returned.

### Examples

Example #1 apd_set_session_trace() example

`<?php
apd_set_session_trace(99);
?>`