PHP semaphore (in same browser)

Question

If I want prevent multiple execution of a code in same browser, why PHP semaphore not working in same browser or another browser tab?

https://www.php.net/manual/en/intro.sem.php

This code work only in different browsers, why not working in same browser, when i execute script simultaneously in same browser (php7.4-fpm + nginx)

$semaphore_key = 25;
$semaphore_max = 1;
$semaphore_permissions = 0666;
$semaphore_autorelease = 1;
$semaphore = sem_get($semaphore_key, $semaphore_max, $semaphore_permissions, $semaphore_autorelease);

if(sem_acquire($semaphore, true) === false) { 
    echo "error";
    exit();
}else{
    echo "ok\n";
}

sleep(30);
sem_release($semaphore);

Answer 1

Possible solution

Your question was a bit confusing, maybe for me? Anyways, I don't know if is this what you wanted, but if it is, you are welcome!

Implement border inside a <div> tag

Firstly you need to set border-box to your div tag. This means you have to include different CSS code for browsers, such as -moz, or -webkit. Obviously you have to specify the height and width to your object, as well as border and background colour. You can also set the margin, but it's not necessary.

Your code should look like this:

HTML

<!-- You can put even <p> tag, or any text tag into div -->
<div>
  Some text... 
</div>

CSS

 div {
        box-sizing: border-box;
        -moz-box-sizing: border-box;
        -webkit-box-sizing: border-box;
        width: 100px; /* Set your div width */
        height: 100px; /* Set your div height */
        border: 10px solid red; /* Optional amount for border, as well as colour*/
        background: #d9dbda;
        margin: 10px; /* This is optional */
      }

If you want to see this sample in your browser, click here.

Answer 2

If you want to underline text, you should probably opt for text-decoration: underline;

.underline { text-decoration: underline; }

<p class="underline">This sentence has a line</p>
<p>Only <span class="underline">part of this sentence</span> has a line</p>

`.

But since I'm not quitte sure what it is you want to accomplish yet and you've asked for styling with borders with other elements (maybe for borders/lines at the top or on the side, or for different styling purposes). I'll add another example with a border. This will also be make it easier to style with different colors, width, etc

.solid-border{
  border-color: black;
  border-width: 1px;
  border-top-style: solid ;
  border-bottom-style: solid ;
}

<div class="solid-border">
  <p>So just some lines for this sentence right?</p>
</div>

<div>
  <p>Or maybe just a <span class="solid-border">small part with lines like</span> this?</p>
</div>