php print during each of nested foreach loops [duplicate]

Question

I have 2 arrays and would like to print to screen after each iteration of the nested loop.

$array1 = array('1','2','3','4','5');
$array2 = array('a','b','c','d','e');
if (ob_get_level() == 0) ob_start();
    foreach($array1 as $number){
        foreach($array2 as $letter){
            echo $number." - ".$letter."<br>";
            sleep(2);
            ob_flush();
            flush();
        }
    }

In the above code, I would expect it would print "1 - a" then wait 2 seconds, then print "1 - b", wait 2 seconds, and so on. whats happening now, is it just prints it all at the end, so i have to wait the total time to see results.

where would i use the ob_start / ob_flush functions to get it to print after each iteration inside array2? i have tried everywhere

How long does it take to return a response? about 50sec? (5*5*2) — Arleigh Hix
– Arleigh Hix, Commented Jul 20, 2023 at 18:20
You can't do this without javascript because php doesn't work on the loaded page, it works before the loading — Lothric
– Lothric, Commented Jul 20, 2023 at 18:20

chyke007 · Accepted Answer · 2023-07-20 18:23:18Z

0

I am guessing when you say print to screen you are talking about the server, in that case you need to move the ob_flush() and flush() outside the inner loop.

This way the output will be flushed after each iteration of $array2:

$array1 = array('1','2','3','4','5');
$array2 = array('a','b','c','d','e');

if (ob_get_level() == 0) ob_start();

foreach ($array1 as $number) {
    foreach ($array2 as $letter) {
        echo $number . " - " . $letter . "<br>";
        sleep(2);
    }
    ob_flush();
    flush();
}

answered Jul 20, 2023 at 18:23

chyke007

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