convert formula into generated outputs

[marcus]

<?php
$equation = "x^3 + 2x^2 + 5x - 3";
$solutions = 10;

$new = str_replace(" ",null,$equation);

$find = "/([a-z])\^([\d]+)/";
$repl = '\1<sup>\2</sup>';

$do = preg_replace($find,$repl,$equation);


echo "<table border=\"0\" cellspacing=\"3\" cellpadding=\"3\" style=\"border:1px solid #000\">\n";
echo "<tr><td colspan=\"2\" align=\"center\"><b>".$do."</b></td></tr>\n";
echo "<tr><td align=\"center\">X</td><td align=\"center\">Y</td></tr>\n";
for($i=(0-$solutions);$i<=$solutions;$i++){
$xf = "/([a-z])\^([\d]+)/";
$xr = pow('\$1','\$2');
$xf2 = "/([\d]+)([x])/";
$xr2 = '\1*'.$i;
$xf3 = "/([\d]+)\^([\d]+)/";
$xr3 = 'pow(\1,\2)';
$orange = preg_replace($xf2,$xr2,$new);
#$apple = preg_replace($xf,$xr,$orange);
$apple = preg_replace ("/([a-z])\^([\d]+)/","pow($1,$2)",$orange);
$banana = preg_replace($xf3,$xr3,$apple);
$final = str_replace("x",$i,$banana);
echo "<tr><td align=\"center\" style=\"border:1px solid #000\">".$i."</td><td align=\"center\" style=\"border:1px solid #000\">".$final."</td></tr>\n";
}
echo "</table>\n";
?>

 

From the code you can see I'm making the equation's variable replaced with $i, how can I successfully create the exact output of each f(x) ?

[amites]

looks like you could use an array

 

   $x = array(
'f' => "/([a-z])\^([\d]+)/",
   'r' => pow('\$1','\$2'),
   'f2' => "/([\d]+)([x])/",
etc...

foreach ($x as $val => $var) {
     echo $val . ' = ' . $var . "\n<br>\n";
}

[marcus]

Don't see how that's going to help me.