What does Exclusive Wall-Time (self-time) mean?

The amount of time a function or method call took minus the duration of all its child methods. This metric is therefore useful to find the methods that consume the most time and are often database, http or I/O related calls.

Take the following example:

<?php

function my_strlen($string)
{
    return strlen($string);
}

When this function my_strlen has an inclusive wall-time(total-time) of 200 and strlen has 150, then the exlusive wall-time(self-time) of my_strlen is 50.

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