Cache - How does php monitor the redis queue in the background to see if it has a value and execute the script if it has a value? How does php monitor the redis queue in the background to see if it has a value and execute the script if it has a value?

How does PHP monitor whether the redis queue has a value in the background and execute the script if there is a value?

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How does PHP monitor whether the redis queue has a value in the background and execute the script if there is a value?

<code class="php">$idle = 0;
$maxWait = 10;
$interval = 50; //50ms
while(true) {
if($redis->lLen() > 0 ) {
     $idle = 0;
    //doing some things
    continue;
}
 //这里很重要
 usleep($interval * ($idle % $maxWait));
 $idle++;
}</code>

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