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POMy PHP calls are not being made in the right order
 

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  1. POMy PHP calls are not being made in the right order
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    <p><strong>UPDATE</strong>: Having read all of your advice I tried using !isset() but that does not seem to work either.</p> <p>If there are 4 calls to the PHP file it seems they must all arrive at the same time so when I perform</p> <pre><code>if(!isset($_SESSION['element_01']) ){$_SESSION['element_01'] = "Something";} </code></pre> <p>it seems 2 or 3 of the calls all find $_SESSION['element_01'] unset!</p> <p>There must be a solution to this!</p> <p>============================================================================</p> <p>I have an application that makes several calls to a php file from the</p> <pre><code>&lt;img src="myfile.php" /&gt; </code></pre> <p>Here is an example:</p> <pre><code>&lt;img src="http://myserver.com/demo/?element=1" &gt;&lt;/img&gt; &lt;img src="http://myserver.com/demo/?element=2"&gt;&lt;/img&gt; &lt;p&gt;Check out our amazing site for everything we offer&lt;/p&gt; &lt;img src="http://myserver.com/demo/?element=3"&gt;&lt;/img&gt; &lt;img src="http://myserver.com/demo/?element=20"&gt;&lt;/img&gt; </code></pre> <p>When I send the element value to the error_log as each makes their call to my index.php file I get the following in my php_error.log: (NB: They seem to be in random orders)</p> <pre><code>[17-Nov-2013 12:53:54] Element = 2 [17-Nov-2013 12:53:54] Element = 1 [17-Nov-2013 12:53:54] Element = 20 [17-Nov-2013 12:53:54] Element = 3 </code></pre> <p>The thing is I rely on element=1 being called first as I an storing a session and using the $_SESSION['element_01'] as a guide for the others but because they seem to reach index.php in random orders this is causing PHP errors such as:</p> <pre><code>PHP Notice: Undefined offset: -1 in http://myserver.com/demo/index.php on line 133 </code></pre> <p>Many users can be arriving at the example web page at the same time, just in case that makes any difference.</p> <p>So to my question:</p> <ol> <li>Is there a way around this or is there a way to ensure they are called in the right order? Something I am doing wrong maybe?.</li> </ol> <p>Thank you.</p>
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    1. COIt is for browsers to decide which image on a page to fetch first. You can however look at JavaScript Images Prefetching and prefetch that very image first.
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      1. USHanky Panky
    2. COThanks for replying. I did wonder if browsers did their own thing on this!
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    3. COIf caching is properly set up the browser might not ask for the images at all on a second visit. Don't rely on what the browser might do: set up your session based on what the server is being asked for. i.e. your PHP script.
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