[convert formula into generated outputs]

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

[convert formula into generated outputs]

<?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) ?

[[SOLVED] simple regex]

works like a charm, thank you.

[[SOLVED] simple regex]

since the php regex forum doesn't seem to be ever-so popular i'd figure i would post here

 

personally i suck when it comes to regular expressions, so if anybody could lead me to a path where i can help understand them it would be great...

 

anyone, my problem is: i'm trying to convert such variables like x^y so that ^y would turn into ^y

 

So if the user inputted x^2 + 5x - 4 the output in HTML would read x² + 5x - 4, and along with more exponents like: x^3 + 3x^2 + 4x - 2 would be x³ + 3x² + 4x - 2

[Sort Two Dimensional Array]

Why don't you sort the numbers with the numbers and the words with the words, and just assign a key to them.

[[SOLVED] Can't update the table]

We established this previously.

 

$query .= implode(", ",$set) . " WHERE `which_month` = '".$this_month."'";

[How to find the GET variable?]

$var = $_GET['unkown'];

 

http://domain.com/file.php?unkown=255

[[SOLVED] Escape String VS Trim VS Strip Slashes.]

Yes, you really only need mysel_real_escape_string and trim, to further your protection you could use strip_tags, htmlentities or any form of removing unwanted items when display your data.

[[SOLVED] Unknown column in where clause]

What revraz said It's common to forget quotes, just use them when you can to escape information, makes error checking a lot easier

[[SOLVED] Escape String VS Trim VS Strip Slashes.]

Keep in mind, the only time you want to really use stripslashes is when you're outputting data from your database.

[[SOLVED] nl2br(); Break line without self closing tag]

echo nl2br($input,false);

 

if that method fails for you

 

$l = str_replace("\r\n","<br>",$line);

[[SOLVED] Escape String VS Trim VS Strip Slashes.]

You can't redefine a function like that.

 

function protect($input){
     return mysql_real_escape_string(trim(strip_tags($input)));
}

$subject = protect($_POST['subject']);
$comment = protect($_POST['comment']);

[[SOLVED] Unknown column in where clause]

$consultsql = "SELECT * FROM `staffsched` WHERE `which_month`='".$curr_month."'";

[[SOLVED] Escape String VS Trim VS Strip Slashes.]

mysql_real_escape_string will add backslashes to unwanted and possibly bad characters. (the best)

trim doesn't really do much but turn "  something  " into "something" by removing the spaces and tabs around it.

stripslashes is bad when tryin to protect your data in URLs, why? because if they found out you used just stripslashes on your variables and nothing else then they would simply just add slashes to be removed.

 

function protect($input){
     return mysql_real_escape_string(trim(strip_tags($input)));
}

 

imo that's sufficient.

[Messaging system]

Um, the foreach statement splits each of the usernames into a new "variable" which then would create a new row for each of the member (hence for each)

[Messaging system]

Well if you were to send multiple messages as once you could just do something like

 

<?php
$to = $_POST['to'];

$e = explode(";",$to);

foreach($e AS $f){
if(is_user($f)){ // fake function
	// insert a message for everybody
}
}
?>

[Problem]

you can try this

 

<?php
$items = $_POST['items'];
$item = array();
$meal = array();

if(count($items) == 5){
foreach($items AS $itemz){
	if(is_int($itemz)){
		$item[$itemz] = $order->getItemByIndex($itemz);
		$meal[$itemz] = $item[$itemz]->getID();
	}
}

if(count($item) == 5){
	echo "GREAT SUCCESS";
}else {
	echo "something went terribly wrong...";
}
}else {
echo "you must select FIVE, not four, not six, but FIVE meals!";
}
?>

[Messaging system]

When creating this keep in mind all the fields.

 

Your PM table should be set up something like this:

id - int(11) - primary key - auto_increment

to - int(11)

from - int(11)

subject - varchar(64)

message - text

status - int(1)

date - varchar(64)

time - int(24)

 

status would be used to define the viewership of it, Unread, Read, Replied, so 0 = Unread, 1 = Read, 2 = Replied

 

When viewing the inbox you just have to know how you want it set up.

 

-Subject- / -From- / -Date Sent- / -Status- / -Delete-

 

And selecting the messages

 

$sql = "SELECT * FROM `pm_table` WHERE `to`='".$_SESSION['uid']."' ORDER BY time DESC LIMIT 15";

 

and you could probably go about from there on your own

 

[how to make every other click on a link display a different link ?]

<?php
session_start();

print_r($_SESSION);

if($_SESSION['clicks'] >= 0){
$_SESSION['clicks'] += 1;
}else {
$_SESSION['clicks'] = 0;
}

$urls = array(0 => 'http://google.com', 1 => 'http://yahoo.com', 2 => 'http://msn.com', 3 => 'http://omgpie.com');

echo "<a href=\"".$urls[$_SESSION['clicks']]."\">".$urls[$_SESSION['clicks']]."</a>\n";
?>

[Php clear history]

Well if you don't want your site to be in their history you can try using

 

<meta http-equiv="cache-control" content="no-cache">

 

in your html head tags

 

or check: http://forums.asp.net/p/1132444/1806081.aspx

[Force file download and autostart on page load]

<?php
ob_start();

$file = $_GET['file'];

if(file_exists($file)){
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
}else {
echo "File does not exist";
}

ob_end_flush();
?>

[Code doesn't list array in order]

Well if either of your variables are arrays you can use natcasesort to sort them.

[[SOLVED] Insert Multiple Phone Number Fields into Database]

<?php
$phones = $_POST['phone'];

$new = "";

$x = 1;
$c = count($phones);

foreach($phones AS $phone){
$pipe = ($x == $c) ? "" : "|";
$new .= $phone . $pipe;
$x++;
}
?>

 

Use $new as your input value, then when you wanna select it just explode it with |

[[SOLVED] Send two different values from PHP through AJAX to PHP]

@Dj Kat

 

You're better off sending the URL and the params separately.

 

var url = 'page.php';
var params = 'val1=something&val2=somethingelse';

 

Then you would open the URL with post or get, and lastly send the params.

 

var http; // then make you necessary xml request type
var url = 'page.php';
var params = 'val1=something&val2=somethingelse';
http.open("POST",url,true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", params.length);
http.setRequestHeader("Connection", "close");
http.onreadystatechange = somefunction;
http.send(params);

 

 

[Need help with code]

Your code is confusing from the get-go

 

<?php
if (isset($_POST['user_id'])) {
    $user_id = mysql_real_escape_string($_POST['user_id']);
    $query = "SELECT id FROM user WHERE id ='" . $user_id . "'";
    $result = mysql_query($query) or die(mysql_error());
    // If the user was found,
    if (mysql_num_rows($result) < 1) {
        error_message("Your Account number was NOT found in our database!");
    } else {
        $row = mysql_fetch_assoc($res);
        if ($row['name'] == $_SESSION['name']) {
            $query2 = "SELECT * FROM user WHERE username = '" . $row['name'] . "'";
            $result2 = mysql_query($query2) or die("Couldn't execute query for collecting your data.");
            $row2 = mysql_fetch_assoc($result2);
            if ($row2['id'] != $user_id) {
                error_message("Sorry your inserted Account number does not match with your username");
            } else {
                #Query = INSERT . . . . .
            }
        }
    }
}
?>