xhprof_enable

Start xhprof profiler

&reftitle.description; `void` `xhprof_enable` `int` `flags` 0 `array` `options`

Start xhprof profiling.

&reftitle.parameters;

`flags`

- Optional flags to add additional information to the profiling. See the XHprof constants for further information about these flags, e.g., `XHPROF_FLAGS_MEMORY` to enable memory profiling.

`options`

- An `array` of optional options, namely, the 'ignored_functions' option to pass in functions to be ignored during profiling.

&reftitle.returnvalues;

&null;

&reftitle.changelog;

&Version; | &Description;
PECL xhprof 0.9.2 | The optional `options` parameter was added.

&reftitle.examples;

### `xhprof_enable` examples

    <?php
    // 1. elapsed time + memory + CPU profiling; and ignore built-in (internal) functions
    xhprof_enable(XHPROF_FLAGS_NO_BUILTINS | XHPROF_FLAGS_CPU | XHPROF_FLAGS_MEMORY);

    // 2. elapsed time profiling; ignore call_user_func* during profiling
    xhprof_enable(
        0,
        array('ignored_functions' =>  array('call_user_func',
                                            'call_user_func_array')));

    // 3. elapsed time + memory profiling; ignore call_user_func* during profiling
    xhprof_enable(
        XHPROF_FLAGS_MEMORY,
        array('ignored_functions' =>  array('call_user_func',
                                            'call_user_func_array')));
    ?>

&reftitle.seealso;

- `xhprof_disable`
- `xhprof_sample_enable`
- `memory_get_usage`
- `getrusage`