I'm a new learner of PHP. I have written the following two files which do seem to work.
- I'd like to know if I can achieve the effect with just one script.
- I'd like to know if there's a better way to do this.
- The dox.php has to redirect to index.php every time, can I do away with the redirection?
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)
Contents of: index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<link rel="stylesheet" type="text/css" href="style2.css" />
<meta content="text/html; charset=ISO-8859-1" http-equiv="content-type">
<title>Project ARC: Adeel's Room Controller</title>
</head><body>
<h1>Welcome to Project ARC</h1>
<?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 '<a href="dox.php?setvalue=128"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[0] . '.png"></a> ';
echo '<a href="dox.php?setvalue=64"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[1] . '.png"></a> ';
echo '<a href="dox.php?setvalue=32"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[2] . '.png"></a> ';
echo '<a href="dox.php?setvalue=16"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[3] . '.png"></a> ';
echo '<a href="dox.php?setvalue=8"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[4] . '.png"></a> ';
echo '<a href="dox.php?setvalue=4"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[5] . '.png"></a> ';
echo '<a href="dox.php?setvalue=2"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[6] . '.png"></a> ';
echo '<a href="dox.php?setvalue=1"><img style="border: 0px solid ; width: 20px; height: 100px;" alt="bit0" src="images/bit' . $bit_array[7] . '.png"></a> ';
?><br>
<br>
</body></html>
Contents of dox.php
<html>
<title>PrimaryCommander</title>
<body>
<?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' ) ;
?>
</body>
</html>
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.
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?)
