while, polling

while-polling.php

<?php

$i = 0;
$var = function () use (&$i) {
    $i++;
    return $i;
};

$iSeconds = 0;
while(($i2 = $var()) < 4 && $iSeconds <= 4) {
    echo "polling {$i2} {$iSeconds}!!!\n";
    $iSeconds++;
    sleep(1);
}

if ($i2 != 3) {
	echo "done polling, task complete\n";
} else {
	echo "done polling, task timed-out\n";
}