JuniorTheoryCommon

What does the program print?

PHP

<?php

function nextId()
{
    static $id = 0;
    $id++;
    return $id;
}

echo nextId(), nextId(), nextId(), "\n";

123

Expecting 111, as if $id started from 0 on every call: static sets it once, and each later call sees the value the previous call left.
Expecting a static variable to be visible outside the function: it keeps its value between calls but is still local to nextId.

JuniorTheoryCommon

PHP

<?php

function nextId()
{
    static $id = 0;
    $id++;
    return $id;
}

echo nextId(), nextId(), nextId(), "\n";

123

Expecting 111, as if $id started from 0 on every call: static sets it once, and each later call sees the value the previous call left.
Expecting a static variable to be visible outside the function: it keeps its value between calls but is still local to nextId.