php 检查代码执行效率小方法

1.输出时间点

echo date('H:i:s.u') , " start xxxxxxx" , PHP_EOL;

/*
do something
*/

echo date('H:i:s.u') , " end xxxxxxx" , PHP_EOL;

xxxx 写描述, PHP_EOL为换行

2.输出时间段

$callStartTime = microtime(true);

/*
do something
*/

$callEndTime = microtime(true);
$callTime = $callEndTime - $callStartTime;

echo 'Call time to do something was ' , sprintf('%.4f',$callTime) , " seconds" , PHP_EOL;

3.输出内存占用情况

echo "Before: " . memory_get_peak_usage() . "\n";

/*
do something
*/

echo "After: " . memory_get_peak_usage() . "\n";