PHP - How To Extract A Given Number Of Characters From A Php Variable

$text = "this is a lot of effing text"


what i want to do is limit it to the 10 characters so it gives back

$stext = substr($text, 10); <-- this is how i thought it would work

echo " $stext";

This topic has been moved to Third Party PHP Scripts.

http://www.phpfreaks.com/forums/index.php?topic=321546.0

Hi, I'm just starting PHP and I ran into a simple problem (that I can fix), but I just want to understand why my first approach doesn't work.

I was testing multiplications and additions and the result I got was unexpected.

Here is the code that doesn't work:
Code: [Select]
<?php
$number1 = 5;
$number2 = 10;

print $number1." multiplied by ".$number2." + 1000 = ".$number1*$number2+1000;
?>

Obviously, what I want as a result when I'm displaying the page is: "5 multiplied by 10 + 1000 = 1050"

What I get: "1005". That's right, nothing else. On top of getting an erroneous answer, the sentence that's supposed to display right before the equation doesn't display at all.

It's even worse if I switch it around like that:

Code: [Select]
print $number1." multiplied by ".$number2." + 1000 = ".1000+$number1*$number2;

I get an error message and nothing displays.

The obvious solution works: using a parenthesis at the beginning and at the end of the equation, which I should do regardless, but still, it's bugging me and since I just started learning PHP today, I want to understand how the code is compiled / interpreted so I don't make stupid mistakes like this one.

Thanks in advance for the replies.

how can you increase the page number in the following line until $status returns an empty result?

curl_setopt($ch, CURLOPT_HTTPHEADER, array("Accept: application/xml", "Authorization: xxxxxxxxxxxxx:xxxxxxxxxxxxxxxx", "Page: 2"));

Hi Guyz,

I need to check the variable $itemDescription to see if the client has entered a '1' before the item description(example: 1 table)

Reason, is the client would like to add sales tax to all NOn-Food related items of 6.25%

This is for a local auction house. It needs to be simple. i,e. Don't wanna add any more form fields. Just let the user type the number 1 before all items that need to be taxed.

Here's my code:
Code: [Select]
<?php
ob_start();
?>
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">

</style>
</head>

<?PHP session_start();
ob_start();
# Config settings below
# Change these to whatever you want :)
#############################

$cellsPerRow = '6';

#############################
include('connect.php');

// These queries get the amount of bidders that are in the database
$getAllBidders = mysql_query("SELECT `id` FROM bidders");
$totalBidders  = mysql_num_rows($getAllBidders);


// This section is to check if the Add New Item form has been submitted
  if($_POST['addNewItem']) {
    // Retrieve Query Strings from URL
    $itemDescription = $_POST['itemDescription'];
    $itemPrice       = $_POST['itemPrice'];
    $winningBidder   = $_POST['winningBidder'];
    $totalDeals      = $_POST['totalDeals'];
    $totalPrice      = ($totalDeals*$itemPrice);

    // Check the submitted data and make sure all is correct
    if(!$itemDescription) {
      $message = 'You must enter an Item Description.';
    } else if(!$itemPrice) {
      $message = 'You must enter an Item Price.';
    } else if(!$winningBidder) {
      $message = 'You must enter a Winning Bidder ID.';
    } else if(!$totalDeals) {
      $message = 'You must enter the amount of Deals.';
    } else if(!is_numeric($winningBidder)) {
      $message = 'The Winning Bidder ID can only be numbers.';
    } else {

      // Check to see if the bidder ID already exists
      $checkBidder = mysql_query("SELECT * FROM bidders WHERE biddersId='$winningBidder' LIMIT 1");
      $checkBidder = mysql_fetch_assoc($checkBidder);

      // If the Bidder ID does not exist, we re-direct to allow us to save the Bidder ID
      if(!$checkBidder) {

        header("Location: ?action=confirmListing&iDesc=".$itemDescription."&iPrice=".$itemPrice."&wBidder=".$winningBidder."&tDeals=".$totalDeals."");

      } else {

        // If Bidder ID exists we just insert the transaction accordingly
        mysql_query("INSERT INTO transactions (`itemDescription`, `itemPrice`, `bidderId`, `itemQty`, `totalPrice`) VALUES ('$itemDescription', '$itemPrice', '$winningBidder', '$totalDeals', '$totalPrice');");
        $message1 = 'The transaction has been successfully added.';

mysql_query("SELECT owed From bidders WHERE biddersId='$winningBidder'") or die(mysql_error());
if ($row['owed']==0) {
mysql_query("UPDATE bidders SET owed='1' WHERE biddersId='$winningBidder'") or die(mysql_error()); 
}
      }

    }

  }

// This section is to check if the Add Bidder to database form has been submitted
  if($_POST['confirmBidder']) {
    $itemDescription = $_POST['itemDescription'];
    $itemPrice       = $_POST['itemPrice'];
    $winningBidder   = $_POST['winningBidder'];
    $totalDeals      = $_POST['totalDeals'];
    $totalPrice      = ($itemPrice*$totalDeals);
    $addBidder       = $_POST['addBidder'];
$checkInput= preg_match([1]+*);


if ($itemDescription== $checkInput)
$itemPrice= $itemPrice * 6.25%;

    mysql_query("INSERT INTO transactions (`itemDescription`, `itemPrice`, `bidderId`, `itemQty`, `totalPrice`) VALUES ('$itemDescription', '$itemPrice', '$winningBidder', '$totalDeals', '$totalPrice');");
    $message1 = 'The transaction has been successfully added.';

   
    if($addBidder == 'Yes') {
      mysql_query("INSERT INTO bidders (biddersId) VALUES ('$winningBidder');");
      $message1 .= '<br> The Bidder ID has also been added.';
mysql_query("SELECT owed From bidders WHERE biddersId='$winningBidder'") or die(mysql_error());
if ($row['owed']==0) {
mysql_query("UPDATE bidders SET owed='1' WHERE biddersId='$winningBidder'") or die(mysql_error()); 
}
    }
     
 if($addBidder == 'No') {
                 $message1 = '<br><font color= "red"> Bidder has NOT been logged.</font>';
               }

   // $itemDescription = '';
   // $itemPrice       = '';
   // $winningBidder   = '';
   //  $totalDeals      = '';
   // $totalPrice      = '';
   // $addBidder       = '';
      }

       

   

 

?>


<?PHP
  // This line of code will check the current task we are doing
  if($_GET['action'] == 'confirmListing') {
    $itemDescription = $_GET['iDesc'];
    $itemPrice       = $_GET['iPrice'];
    $winningBidder   = $_GET['wBidder'];
    $totalDeals      = $_GET['tDeals'];
?>

<form name="confirmBidder" method="POST" action="?">

<?PHP
// This is the hidden data from the previous form
// Better than using sessions and GET query
?>
<input type="hidden" name="itemDescription" id="itemDescription" value="<?PHP echo $itemDescription;?>">
<input type="hidden" name="itemPrice" id="itemPrice" value="<?PHP echo $itemPrice;?>">
<input type="hidden" name="winningBidder" id="winningBidder" value="<?PHP echo $winningBidder;?>">
<input type="hidden" name="totalDeals" id="totalDeals" value="1">

<table cellpadding="0" cellspacing="1" border="0" style="background: #ffffff; margin: auto;">
 <tr>
  <td colspan="2" class="formHeader"> Add New Auction Item </td>
 </tr>
 <tr>
  <td class="formField"> Add This Bidder? </td>
  <td class="formValue"> <select name="addBidder" id="addBidder" class="input" style="width: 195px;"> <option value="Yes">Yes</option> <option value="No">No</option></select> </td>
 </tr>
 <tr>
  <td colspan="2" class="formButton">
<input type="submit" name="confirmBidder" id="confirmBidder" value="Confirm Bidder Action?">
<input type="reset" name="reset" id="reset" value="Reset Form">
  </td>
 </tr>
</table>
</form>

<?PHP
  // If the action is not to confirm a listing then show add item section
  } else {
?>

<?PHP//----- Add New Item Section -----\\?>

<?PHP
  if($message) {
    echo '<div class="Error">',$message,'</div><div style="height: 10px;"></div>';
  } else if($message1) {
    echo '<div class="Success">',$message1,'</div><div style="height: 10px;"></div>';
  }
?>

<form name="addNewItem" method="POST" action="?">
<table cellpadding="0" cellspacing="1" border="0" style="background: #ffffff; margin: auto;">
 <tr>
  <td colspan="2" class="formHeader"> Add New Auction Item </td>
 </tr>
 <tr>
  <td class="formField"> Item Description </td>
  <td class="formValue"> <input type="text" name="itemDescription" class="formText" id="itemDescription" value="<?=$itemDescription;?>" style="width: 195px;"> </td>
 </tr>
<tr>
 <td class="formField"> Item Price </td>
  <td class="formValue"> <input type="text" name="itemPrice" class="formText" id="itemPrice" value="<?=$itemPrice;?>" style="width: 195px;"> </td>
 </tr>
 <tr>
  <td class="formField"> Winning Bidder ID </td>
  <td class="formValue"> <input type="text" name="winningBidder" class="formText" id="winningBidder" style="width: 195px;"> </td>
 </tr>
 <tr>
  <td class="formField"> How Many Deals? </td>
  <td class="formValue"> <input type="text" name="totalDeals" class="formText" id="totalDeals" value="1" style="width: 195px;"> </td>
 </tr>
 <tr>
  <td colspan="2" class="formButton">
<input type="submit" name="addNewItem" id="addNewItem" value="Add New Auction Item?">
<input type="reset" name="reset" id="reset" value="Reset Form">
  </td>
 </tr>
</table>
</form>

<?PHP//----- Add New Item Section -----\\?>

<?PHP } ?>


All help appreciated to the fullest...
 

I'm new at PHP and have a problem.
I have a MySql database with lists of students grouped into classrooms. A typical group is shown in the attached screenshot screenshot.docx. I want to be able to select one or more of the names by using the associated checkbox, and upgrade a student or students into a different group as defined in the radio button list also in the screenshot.
I have the rudiments of the file attached, but I have absolutely no idea how I can post the array so that the records are updated.
Each student has an individual record with a field name userGroup which holds a string nominated by their classroom teacher, such as "year7", "year 8" and so on while they are in one of the several classrooms, but when they leave school this is recorded in a field named noGroup with a value of 0 or 1.
I can post further details as required, but it would be great if someone could help me.

Hi,

How can I check if a variable only has these characters:
- number (0-9)
- decimal point (.)
- positive (+)
- negative (-)
- dollar ($)

I tried is_numeric, but it doesn't like negative values...

I need to add the variable value to another variable. I have to accept numbers (including negative and decimals)...

ex:
0.1 = TRUE
-.1 = TRUE
12 = TRUE
1000.00 = TRUE
12a = FALSE



thanks

Hi everyone,

Like the title says I need to count the amount of 1's in a column but I can't figure out how.

Gr and thanx already
Ryflex

I'm getting the dreaded " Invalid parameter number: number of bound variables does not match number of tokens" error and I've looked at this for days.  Here is what my table looks like:

|  id          | int(4)       | NO   | PRI | NULL    | auto_increment |
| user_id     | int(4)       | NO   |     | NULL    |                |
| recipient   | varchar(30)  | NO   |     | NULL    |                |
| subject     | varchar(25)  | YES  |     | NULL    |                |
| cc_email    | varchar(30)  | YES  |     | NULL    |                |
| reply       | varchar(20)  | YES  |     | NULL    |                |
| location    | varchar(50)  | YES  |     | NULL    |                |
| stationery  | varchar(40)  | YES  |     | NULL    |                |
| ink_color   | varchar(12)  | YES  |     | NULL    |                |
| fontchosen  | varchar(30)  | YES  |     | NULL    |                |
| message     | varchar(500) | NO   |     | NULL    |                |
| attachment  | varchar(40)  | YES  |     | NULL    |                |
| messageDate | datetime     | YES  |     | NULL    |        

Here are my params:

            $params = array(                 
               ':user_id' => $userid,                 
               ':recipient' => $this->message_vars['recipient'],                 
               ':subject' => $this->message_vars['subject'],                 
               ':cc_email' => $this->message_vars['cc_email'],                 
               ':reply' => $this->message_vars['reply'],                 
               ':location' => $this->message_vars['location'],                 
               ':stationery' => $this->message_vars['stationery'],                 
               ':ink_color' => $this->message_vars['ink_color'],                 
               ':fontchosen' => $this->message_vars['fontchosen'],                 
               ':message' => $messageInput,                 
               ':attachment' => $this->message_vars['attachment'],                 
               ':messageDate' => $date             );

Here is my sql:

$sql = "INSERT INTO messages (user_id,recipient, subject, cc_email, reply, location,stationery, ink_color, fontchosen, message,attachment) VALUES( $userid, :recipient, :subject, :cc_email, :reply, :location, :stationery, :ink_color, :fontchosen, $messageInput, :attachment, $date);";

And lastly, here is how I am calling it:
            $dbh = parent::$dbh;             
           $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);              
           if (empty($dbh))    return false;             
                  $stmt = $dbh->prepare($sql);             
                 $stmt->execute($params) or die(print_r($stmt->errorInfo(), true));              
           if (!$stmt) {    print_r($dbh->errorInfo());              }

I know my userid is valid and and the date is set above (I've echo'd these out to make sure).  Since the id is auto_increment, I do not put that in my sql (though I've tried that too), nor in my params (tried that too).  What am I missing?  I feel certain it is something small, but I have spent days checking commas, semi-colons and spelling.  Can anyone see what I'm doing wrong?

I'm trying to increase the variables $schedulemonth, $scheduledate, $scheduleyear in each loop so that they look like $schedulemonth1, $schedulemonth2, $schedulemonth3, etc... for each of them.  I've tried several options and know I'm on the right track, but no go.

The customer will choose how many payments and the script below will loop that many times - I have that part working - but the calendar I'm using with the variables above is the issue.

Here's the code I'm using.

while ($balance > 0){

if ($balance>$monthlypayment){
$myCalendar = new tc_calendar("date" . $paymentnumber, true);$myCalendar->setIcon("images/iconCalendar.gif");$myCalendar->setDate($scheduledate, $schedulemonth, $scheduleyear);
//output the calendar
$myCalendar->writeScript();
echo "&nbsp;&nbsp;&nbsp;";
echo "<input type=\"text\" name=\"payment" . $monthlypayment . "\" value=\"" . $monthlypayment . "\">\n";
$paymenttotal=($monthlypayment+$paymenttotal);
$balance=round(($invoicetotal-$paymenttotal),2);
echo "&nbsp;&nbsp;&nbsp;Balance: $balance\n";
$schedulemonth++;
if ($schedulemonth==13){
$schedulemonth=1;
$scheduleyear=($scheduleyear+1);
}
echo "<br>\n";
}
if ($balance<$monthlypayment||$balance==$monthlypayment){
$myCalendar = new tc_calendar("date" . $paymentnumber, true);$myCalendar->setIcon("images/iconCalendar.gif");$myCalendar->setDate($scheduledate, $schedulemonth, $scheduleyear);
//output the calendar
$myCalendar->writeScript();
echo "&nbsp;&nbsp;&nbsp;";
echo "<input type=\"text\" name=\"payment" . $paymentnumber . "\" value=\"" . $balance . "\">\n";
$paymenttotal=($balance+$paymenttotal);
$balance=round(($invoicetotal-$paymenttotal),2);
echo "&nbsp;&nbsp;&nbsp;Balance: $balance\n";
$schedulemonth++;
if ($schedulemonth==13){
$schedulemonth=1;
$scheduleyear=($scheduleyear+1);
}
echo "<br>\n";
}
}


Additionally it needs to  pick up each of these variables on the next page  the variables are part of hidden fields in an form later in the page.  So my question is actually 3 fold.
1. How do I increase the variable count in the loop above.
2. How do I put the <input type="hidden".......> in the form so that it loops through and catches the increasing variables
3. How do I loop through on the insertion page after the form is submitted to catch how many inserts to the database are needed.

This one has me bent over.

So I have been working on my website for a while which all is php&mysql based, now working on the social networking part building in similar functions like Facebook has. I encountered a difficulty with getting information back from a link. I've checked several sources how it is possible, with title 'Facebook Like URL data Extract Using jQuery PHP and Ajax' was the most popular answer, I get the scripts but all of these scripts work with html links only. My site all with php extensions and copy&paste my site links into these demos do not return anything . I checked the code and all of them using file_get_contents(), parsing through the html file so if i pass 'filename.php' it returns nothing supposing that php has not processed yet and the function gets the content of the php script with no data of course. So my question is that how it is possible to extract data from a link with php extension (on Facebook it works) or how to get php file executed for file_get_contents() to get back the html? here is the link with code&demo iamusing: http://www.sanwebe.c...-php-and-jquery thanks in advance.

Hello, I have problem durring binding update query. I can't find what is causing problem.

public function Update(Entry $e)
    {
        try
        {
            $query = "update entry set string = $e->string,delimiter=$e->delimiter where entryid= $e->id";
            $stmt = $this->db->mysqli->prepare($query);
            $stmt->bind_param('ssi',$e->string,$e->delimiter,$e->id);

            $stmt->close();
           

        }
        catch(Exception $ex)
        {
            print 'Error: ' .$ex->getMessage();
        }
    }

When I run function update I'm getting next error:Warning: mysqli_stmt::bind_param(): Number of variables doesn't match number of parameters in prepared statement   Can you help me to solve this problem ?
Edited by danchi, 17 October 2014 - 10:25 AM.

I need to display a number(the number is retrieved from the db) in the form input field such that only the last 4 digits is visbile, the remaining can be masked as * or X or whatever is applicable.

I know the last 4 can be obtained as follows:

    Code: [Select]
$number=substr($number,-4,4);
 
But when i hit the submit button the form validates the input field and checks if the number is a valid number of a specific format.
Therefore when I click on the submit button then I should still be able to unmask the masked numbers or do something similar that would help me validate the whole number.

  Code: [Select]
  <input type="text" name="no" value="<?php if(!empty($number)){ echo $number;} ?>">

Hey

I have a string that looks like the following:
Quote

top-php-tutorials-2.html


I have a script that cycles through each page. The 2 in the quote above is the page number.

How can I extract the number between the - and the .html and replace it with another number?

I've tried
Code: [Select]
substr($engine->selectedcaturl, 0,-6).$v.".html"But then I realised this only works for numbers that are 1 digit long

Any input would be appreciated