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@NogDogMar 04.2005 — #
Sure does, but not because the eval() syntax is wrong, but because $calc is empty when you first access the page. This works just fine:
eval() function
Revisiting this calculator script, now this is what i have:
[code]
<?php
$hist = $_POST[‘hist’];
$calc = $_POST[‘calc’];
eval(“$calc2 = “$calc”;”);
$hist = $hist . $calc2. ” = ” . $calc . “<br>”;
echo $hist ;
?>
<form method=”post” action=”index.html”>
<input type=”hidden” name=”hist” value=”<?php echo($hist); ?>”>
<input type=”text” name=”calc” size=”50″><br>
<input type=”submit” value=”solve”>
</form>
Almost works, except it doesn’t actually eval the problem, it just spits it back out as a string. There is something wrong in the eval parameter. This is crazy, this function is SOOOOOOOOOOO weird! I keep playing around with the syntax, but the only one that wont give me an error is this one (taken from php.net manual)
Anyhu, any help with this? I think all the rest of the script is perfect, I just need to get the parameter in that eval function notated correctly. PLEASE HELP!
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@NogDogMar 04.2005 — #[i]Originally posted by gameguy43 [/i]
[B]nope, that gives me an error message [/B][/QUOTE]
Sure does, but not because the eval() syntax is wrong, but because $calc is empty when you first access the page. This works just fine:
[code=php]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang='en'>
<head>
<META HTTP-EQUIV='Content-Type' CONTENT='text/html; charset=ISO-8859-1'>
<title>Calculator</title>
<style type="text/css">
<!--
body {
background-color: white;
font: medium arial, helvetica, sans-serif;
}
div {
width: 44em;
margin: 1em auto;
padding: 1em;
}
#hist {
float: right;
width: 15em;
margin: 0 0 0 2em;
padding: 1em;
border: solid thin gray;
}
-->
</style>
</head>
<body>
<div>
<h1 style="text-align: center;">PHP Calculator</h1>
<p id=hist>
<?php
if(isset($_POST['calc']))
{
$hist = $_POST['hist'];
$calc = $_POST['calc'];
eval("$calc2 = $calc;");
$hist = "$hist$calc = $calc2<br>";
echo $hist ;
}
?>
</p>
<form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>">
<p>Enter calculation:<br>
<input type="hidden" name="hist" value="<?php echo($hist); ?>">
<input type="text" name="calc" size="50"><br>
<input type="submit" value="solve"></p>
</form>
</div>
</body>
</html>
[/code]