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POLearning PHP - Is there a better way to do this?
 

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  1. POLearning PHP - Is there a better way to do this?
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    <p>I'm a new learner of PHP. I have written the following two files which do seem to work.</p> <ol> <li>I'd like to know if I can achieve the effect with just one script.</li> <li>I'd like to know if there's a better way to do this.</li> <li>The dox.php has to redirect to index.php every time, can I do away with the redirection?</li> </ol> <p>To summarize the content of both files in words: Index.php creates a page with 8 images on it. All these 8 images have alternate versions which indicate that the image/button is active or not. Click on the button and the action is performed, click on it again and the action performed is reversed. (XOR function is used) - The current condition of the image/button is dictated by an external variable. (kind of like a feedback system)</p> <h2>Contents of: index.php</h2> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"&gt; &lt;html&gt;&lt;head&gt; &lt;link rel="stylesheet" type="text/css" href="style2.css" /&gt; &lt;meta content="text/html; charset=ISO-8859-1" http-equiv="content-type"&gt; &lt;title&gt;Project ARC: Adeel's Room Controller&lt;/title&gt; &lt;/head&gt;&lt;body&gt; &lt;h1&gt;Welcome to Project ARC&lt;/h1&gt; &lt;?php $curx_val=shell_exec('sudo pin 0x378'); $curx_val=decbin($curx_val); $curx_val=str_pad($curx_val,8,0,STR_PAD_LEFT); //echo "$curx_val"; $bit_array=str_split($curx_val,1); //echo "$bit_array[7]"; echo '&lt;a href="dox.php?setvalue=128"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[0] . '.png"&gt;&lt;/a&gt; '; echo '&lt;a href="dox.php?setvalue=64"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[1] . '.png"&gt;&lt;/a&gt; '; echo '&lt;a href="dox.php?setvalue=32"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[2] . '.png"&gt;&lt;/a&gt; '; echo '&lt;a href="dox.php?setvalue=16"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[3] . '.png"&gt;&lt;/a&gt; '; echo '&lt;a href="dox.php?setvalue=8"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[4] . '.png"&gt;&lt;/a&gt; '; echo '&lt;a href="dox.php?setvalue=4"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[5] . '.png"&gt;&lt;/a&gt; '; echo '&lt;a href="dox.php?setvalue=2"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[6] . '.png"&gt;&lt;/a&gt; '; echo '&lt;a href="dox.php?setvalue=1"&gt;&lt;img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[7] . '.png"&gt;&lt;/a&gt; '; ?&gt;&lt;br&gt; &lt;br&gt; &lt;/body&gt;&lt;/html&gt; </code></pre> <p>Contents of dox.php</p> <pre><code>&lt;html&gt; &lt;title&gt;PrimaryCommander&lt;/title&gt; &lt;body&gt; &lt;?php //Variable Declaration $set_val=$_REQUEST["setvalue"]; //Which light to switch on $cur_val=shell_exec('sudo pin 0x378'); //Current lights which are ON settype($set_val,"integer"); $xor_result=$set_val^$cur_val; shell_exec('sudo parashell 0x378 '.$xor_result); header( 'Location: index.php' ) ; ?&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Edit1: This script interfaces with the parallel port - thus the shell_exec command. The command 'sudo parashell 0x378 0' sets all pins of parallel port to 0.</p> <p>Edit2: I understand that once the page has been rendered, it cannot be changed. But can I make the page so as to reflect live changes? (Somewhat like the facebook live feed feature?)</p>
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    1. COooooh..... `shell_exec` .....
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    2. COLearning PHP using shell commands? What is this script for?
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    3. COLooks ok/safe to me, since you are using a typecast with `settype()`. To have the page contents update in-place you should investigate jQuerys `.load()` function. You should combine both scripts (update code on top, and outputting data below), pack everything into a `<div id="LEDs">` to facilitate the live updating.
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