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# apd_set_pprof_trace

(PECL)

apd_set_pprof_trace -- Starts the session debugging

## 说明

void apd_set_pprof_trace ( [string dump_directory] )

Starts debugging to `pprof_{process_id}` in the dump directory.

## 参数

`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.

## 返回值

无返回值。

## 范例

例 1. apd_set_pprof_trace() example

`<?php apd_set_pprof_trace(); ?>`

## 参见

apd_set_session_trace()

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