Xhprof PHP性能测试工具

Question

在考虑是否进行性能分析时，你首先要想：应用是否存在性能问题？如果有，你要进一步考虑：这个问题有多大？

如果你不这样做，将会陷入一个陷阱——过早优化，这可能会浪费你的时间。

<?php
xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);

$fruits = array(
    "apple" => "yummy",
    "orange" => "ah ya, nice",
    "grape" => "wow, I love it!",
    "plum" => "nah, not me"
);
$obj = new ArrayObject( $fruits );
$it = $obj->getIterator();

// The good thing here is that it can be iterated with foreach loop

foreach ($it as $key=>$val)
echo $key.":".$val."\n";

$xhprof_data = xhprof_disable();

$XHPROF_ROOT = "";
include_once $XHPROF_ROOT . "xhprof_lib/utils/xhprof_lib.php";
include_once $XHPROF_ROOT . "xhprof_lib/utils/xhprof_runs.php";

$xhprof_runs = new XHProfRuns_Default();
$run_id = $xhprof_runs->save_run($xhprof_data, "xhprof_testing");

echo "http://localhost/xhprof_html/index.php?run={$run_id}&source=xhprof_testing\n";