PHP - Array Value Exists

Hi, I am a newbie in PHP (about week and a half). I'm writing a website for myself right now. I've got a problem that I cannot solve.

The website is about buying files with website custom balance. What I want to do is disable buy button if user bought this file b4. The is a table user_files that stores user id and file id.

And another table that stores files data, ID name who uploaded date time ect....

What I'm trying to do, is disabling buy button if the user has already the file.

This is what I've done :

while ($row = $rocket->fetch())
                  {
                  ?>
                    <tr>
                      <td><?php echo $row['id']; ?></td>
                      <td><?php echo $row['name']; ?></td>
                      <td><?php echo $row['uploader']; ?></td>
                      <td><?php echo $row['uploadtime']; ?></td>
                      <td><button <?php 
                      // Echo "disabled" if $row['id'] id is present in row2['file_id'] <<<<<<< Need to do this in a while.
                      ?>
                      ><a href="download.php?id=<?php echo $row['id']; ?>"></a><?php echo $row['price'] . "D$" ?></button></td> 
                    </tr>
                  <?php } ?>

What I can't do is check if the file id ($row['id']) is present in ($row2['file_id']), if yes echo "disabled";

 

Hi All,

There is a very interesting solved topic here (http://www.phpfreaks.com/forums/index.php?topic=304966.0) about how to access elements in embedded _POST array.

But before accessing an element, it might be appropriate to check whether the array it is supposed to be in exists.

According to the solution given in the topic indicated above, Code: [Select]
$_POST['matType'] is an example of embedded array . Is there a way to check if this array exists?

Thanks in advance for your help.

Can someone explain why this code:
if (mysql_result($data,0,$SQLLargeName) = " "){
$LargeImage = "#";
}
else {
$LargeImage = mysql_result($data,0,$SQLLargeName);
}


Gives me this error?
Fatal error: Can't use function return value in write context in /home/worldw44/public_html/SQL.php on line 38


And ways round it?

Thanks.

Hi community,i creating a simple website and description
i analyzed my code about 3days...2hours a day.
if i get the point in my head.then its say Website url is in use..but not..ok maybe i give the code below.
so if you can explain whats wrong.thanks
Code: [Select]
<?php
include_once ('connect.php');
$url= mysql_real_escape_string($_POST['url']);
$desc=mysql_real_escape_string($_POST['desc']);
if ($id == "krauti")
{
    if (empty($_POST['url']) && empty($_POST['desc']))
    {
        die('<br><center>Both Empty!.<center/><br/>');

    }
    if (empty($_POST['url']))
    {
        die('<br><center>URL Empty!.<center/>');

    }
    if (empty($_POST['desc']))
    {
        die('<br><center>desc empty fill it!.<center/>');
    }
    
     
        
       
       $url = htmlspecialchars( stripslashes( strip_tags($_POST['url'] ) ) );
$aprasymas = htmlspecialchars( trim($_POST['desc'] ) );


$query = mysql_query("SELECT * FROM linkai WHERE url = '$url' AND 'desc' = '$desc'");
if( mysql_num_rows( $query ) == 1 ) {
    "INSERT INTO linkai ".
       "(id, url, desc) ".
       "VALUES('','$_POST[url]','$_POST[desc]')";
       echo "Yes!."; 

}
 
    else if (mysql_num_rows($query) == 0 ){
 
echo "No!!";
}

}  
?>

I apologize in advance for any misuse of terminology. I find that I am rather ignorant in such things.

I'm working on a WordPress theme. Specifically on the part that shows the "next: link-to-next-post" and "previous: link-to-prev-post" links.

Here is the code that I have:
Code: [Select]
<?php
  $nextvar=next_post_link('%link');
  $prevvar=previous_post_link('%link');
?>

<?php if (isset($nextvar)) { ?>
<h3>Next</h3>
<p><?php next_post_link('%link'); ?></p>
<? } ?>

<?php if (isset($prevvar)) { ?>
<h3>Previous</h3>
<p><?php previous_post_link('%link'); ?></p>
<? } ?>
The first part intends to check if the links exist. And this works fine.

However, the only output I'm getting are the values of $nextvar and $prevvar. The headers are nonexistent. What's wrong?

Any help is much appreciated, and I thank you in advance.

Hi all,

I have the following mysql delete query that essentially deletes a row from two seperate tables "messages" and "messages2" where the id is equal to that in both of the tables. The problem I am getting (for obvious reasons) is that it will only delete from the table, if it indeed exists in both tables.

Here is the query:

Code: [Select]
DELETE FROM messages,messages2 USING messages,messages2 WHERE messages.id = messages2.id AND messages.id = ?;

How would I go about setting it so that the query always deletes from table "messages" and only deletes from "messages2" when a corresponding id exists?

I think it would involve an IF EXISTS clause, but I am not sure on this, or indeed how to implement it.

Thanks in advance guys

Dan

Hi,

I have a sign up form that generates a activation key and emails it to user and they cannot login until account has been activated etc.

My problem is i am not sure how to in php generate a new activation key if the generated one has already been used.

I know how to do the MySQL query to check if activation key already exists but not sure how to basically tell PHP that if the activation key already exists in DB then generate a new key until one is found that does not already exist.

I gather i may need a loop but not sure. Could someone please help ?

Like i say i know how to do the MySQL query just need some sample code to know how to do what i asked above.

Thanks for anyhelp; Much Appreciated

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function popUp(URL,URL2) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL,'" + id + "', 'toolbar=0,scrollbars=1,location=0,top=10,left=10,statusbar=0,menubar=0,resizable=0,width=408,height=400');");

day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL2,'" + id + "', 'toolbar=0,scrollbars=1,location=0,top=10,left=450,statusbar=0,menubar=0,resizable=0,width=408,height=400');");
}
// End -->
</script>

I have a map which shows sales people by location and if more then one sales person exists then I would need 2 pop up windows.   This works great other than the fact that the areas with one sales person are getting a blank 2nd popup as a second salesperson does not exist.   Any help would be appreciated.   Thanks In Advance
Edited by phpbeginner, 27 June 2014 - 05:52 AM.

This topic has been moved to MySQL Help.

http://www.phpfreaks.com/forums/index.php?topic=328831.0

My error below returns (echos) that there is no data under the table sites to display. But, there is. Why is it doing this?

class_l.php

<?php

class displaySites 
{

function grabSites()

{

$query = mysql_query("SELECT title,description,votes,dates,comments,out,in FROM sites ORDER BY id DESC LIMIT 100");

if(mysql_num_rows($query) > 0)

{

while($fetch = mysql_fetch_assoc($query))

{

echo "

<div id='post-1' class='post'>

<h2 class='title'><a href='#'>". $fetch['title'] ."</a></h2>

<h3 class='date'>Submitted on ". $fetch['date'] ."</h3>

<div class='entry'>

<p>". nl2br(stripslashes($fetch['description'])) ."</p>

</div>

<p class='meta'><a href='#'>View</a></p>

<div class='hr'>

</div>

</div>

";

}

}

else

{

echo "

<div id='post-1' class='post'>

<h2 class='title'><a href='#'>Oh NOEZ!</a></h2>

<h3 class='date'>". date("M-d-Y") ."</h3>

<div class='entry'>

<p>There are currently no sites to display!</p>

</div>

<p class='meta'>View</p>

<div class='hr'>

<hr />

</div>

</div>

";

}

}
}

class register
{

function createAccount()

{

$username = mysql_real_escape_string($_POST['username']);

$password = md5(sha1(sha1($_POST['password'])));

$name = mysql_real_escape_string($_POST['title']);

$description = mysql_real_escape_string($_POST['description']);

if(isset($username) && isset($password) && isset($name) && isset($description))

{

if(!$username || !$password || !$name || !$description)

{

echo '<table border="0"><form action="register.php" method="POST">

<tr><td>Username</td><td><input type="text" name="username" maxlength="20"></td></tr>

<tr><td>Password</td><td><input type="text" name="password" maxlength="30"></td></tr>

<tr><td>Site Name</td><td><input type="text" name="title" maxlength="25"></td></tr>

<tr><td>Site Description</td><td><textarea cols="40" rows="18" name="description" maxlength="750"></textarea></td></tr>

<tr><td>Finish!</td><td><input type="submit"></td></tr>

</form></table>';

}

else

{

$query = mysql_query("SELECT * FROM sites WHERE username = '$username' LIMIT 1");

if(mysql_num_rows($query) > 0)

{

echo "Sorry, an account with this username already exists.";

}

else

{

$date = date("M-d-Y");

$ip = $_SERVER['REMOTE_ADDR'];

//create their account

mysql_query("INSERT INTO sites VALUES (null, '$username', '$password', '$name', '$description', 0, 0, 0, '$date', '$ip', 0)");

echo "You have successfully registered your site on NovaTops! <a href='login.php'>Login</a>";

}

}

}

else

{

echo "One or more of the variables are not set.";

}

}
}

class login 
{

function verifyLogin()

{

$username = mysql_real_escape_string($_POST['username']);

$password = md5(sha1(sha1($_POST['password'])));

if(isset($username) && isset($password))

{

if(!$username || !$password)

{

echo "<table><form action='login.php' method='POST'>

<tr><td>Username</td><td><input type='text' name='username' maxlength='20'></td></tr>

<tr><td>Password</td><td><input type='password' name='password' maxlength='30'></td></tr>

<tr><td>Finished?</td><td><input type='submit'></td></tr>

</form></table>";

}

else

{

$query = mysql_query("SELECT * FROM sites WHERE username = '$username' AND password = '$password'LIMIT 1");

if(mysql_num_rows($query) > 0)

{

echo "Congratulations! You have successfully logged in! <a href='index.php'>Home</a>";

$_SESSION['user'] = $username;

}

else

{

echo "It seems you've typed in the wrong username and/or password. <a href='login.php'>Try Again</a>";

}

}

}

else

{

echo "One or more of the variables aren't set.";

}

}
}
?>


index.php


<?php
include_once('includes/config.php');
include_once('class_l.php');

?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title><?php echo $title; ?></title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<link href="styles.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="wrapper">
   <div class="top_text"><h1><a href="#"><?php echo $site_name; ?></a></h1>

    <h2><a href="#"><?php echo $slogan; ?></a></h2></div>

<div id="content">

<div id="blog">

<div id="post-1" class="post">

<h2 class="title"><a href="#">Welcome to NovaTops!</a></h2>

<h3 class="date">Created on April 06, 2011</h3>

<div class="entry">

<p>Hello there! If your viewing this message right now, your on the awesome site called NovaTops! NovaTops allows you to register

your site in our database, and then the site's script automatically starts to rank your site. The higher your rank, the more likely

your site's going to get a ton of views!</p>

</div>

<div class="hr">

<hr />

</div>

</div>

<!-- end #post-1 -->

<?php

$displaySites = new displaySites();

$displaySites->grabSites();

?>

</div>

<!-- end #blog -->

<?php include_once('includes/navigation.php'); ?>

<!-- end #sidebar -->

<div style="clear: both; height: 1px;"></div>

</div>

<!-- end #content -->

<div id="footer">

<p>Copyright &copy; 2011. Design by <a href="http://www.flashtemplatesdesign.com/" title="Free Flash Templates">Free Flash Templates</a></p>

<p><a href="#">Privacy Policy</a> | <a href="#">Terms of Use</a> | <a href="http://validator.w3.org/check/referer" title="This page validates as XHTML 1.0 Transitional"><abbr title="eXtensible HyperText Markup Language">XHTML</abbr></a> | <a href="http://jigsaw.w3.org/css-validator/check/referer" title="This page validates as CSS"><abbr title="Cascading Style Sheets">CSS</abbr></a></p>

</div>
</div>
<!-- end #wrapper -->
</body>
</html>

What is the best/proper way to check if a supplied URL goes to an actual image?  My site will allow users to enter an image URL (like "http://example.com/images/monkey.jpg").  I will store the URL they enter in a MySQL database and then will call it up later and do some resizing to these images. 

But I don't want to try to do any resizing if the URL they supply doesn't actually go to an image, or if it's blank (i.e. the user didn't enter a URL yet). 

So basically, I will run a MySql query to pull back the contents of the column called "imageurl".  Let's say those contents are stored in a variable called $imageurl.  This is what I'm trying to accomplish....

Code: [Select]
if ($theimageurl does NOT contain a URL to an image OR is blank) {
// do this
} else {
//run my resizing code
}
I guess i could do this to check to see if it's blank, but not sure this is proper/most efficient way to check that part of the issue...

Code: [Select]
if (trim($theimageurl) == "")
But greater than the "is it blank" concern is that people may enter URLs that just to a regular website so whether it's at this point in my code (or for security, I should probably do it BEFORE inserting it into my database :/ ) so curious if there are any functions that check to see if it's an image URL or not.  I know of file_exists, but I'm pretty sure that's just checking to see if a file exists and doesn't check image URLs.

Any info/suggestions would be appreciated as always! 

And if there are any recommended functions to check/clean the user-entered URL BEFORE it's entered into the database, please share

Thanks!

I am making a secure registration for my website and looking for a function that will verify with a user inputted date exists.

From my registration html form I am putting a month, day and year , each inputted separately into a single variable:
Code: [Select]
$bday = $year . "-" . $month . "-" . $day;
My birthday input looks like:

Code: [Select]
<div class=\"Container FormBoxLeft\">
  <b>Birthdate:</b>
</div>
<div class=\"Container FormBoxRight\">
  <select name=\"month\"><option value=\"\">-Month-</option>
  <option value=\"01\">January</option>
  <option value=\"02\">February</option>
  <option value=\"03\">March</option>
  <option value=\"04\">April</option>
  <option value=\"05\">May</option>
  <option value=\"06\">June</option>
  <option value=\"07\">July</option>
  <option value=\"08\">August</option>
  <option value=\"09\">September</option>
  <option value=\"10\">October</option>
  <option value=\"11\">November</option>
  <option value=\"12\">December</option>
  </select>&nbsp;
<select name=\"day\">
<option value=\"\"> -Day-</option>';
//Print 31 Days
";
    for ($x=1; $x<=31; $x++) {
        echo "<option value='".$x."'"; if(isset($_POST['submit']) && $day == $x) { echo " selected"; } echo ">".$x."</option>\n";
    }
echo "</select>&nbsp;
  <input name=\"year\" size=\"2\" maxlength=\"4\" type=\"text\">

So.. What I am asking is.. is there a secure way to check if the date the user inputted exists, or is there a better way to make the form more secure from that part.  Upon finding the users birthdate I am also wanting to check if the user is a certain age.

Hello,

I want to check when adding a new user, that if there are 2 records that has the same recruiter id, it's should give an error, if less, than it makes him complete the registration

Also check if the National ID number is not assigned to another user, so if there is a record that has it, it should give and error, if it's unavailable, it should let him complete the registration

here is my code

register.html

Code: [Select]
<html>
  <form action="post.php" method="post">
<table>
<tr><td>First Name: <input type="text" name="fname" /></td></tr>
<tr><td>Middle Name: <input type="text" name="mname" /></td></tr>
<tr><td>Last Name: <input type="text" name="lname" /></td></tr>
<tr><td>Mobile: <input type="text" name="mobile" /></td></tr>
<tr><td>Telephone: <input type="text" name="tel" /></td></tr>
<tr><td>Address: <input type="text" name="address" /></td></tr>
<tr><td>Job Title: <input type="text" name="job" /></td></tr>
<tr><td>Company: <input type="text" name="company" /></td></tr>
<tr><td>National ID Number: <input type="text" name="nid" /></td></tr>
<tr><td>Recruiter ID: <input type="text" name="recruiteris" /></td></tr>
<tr><td>Email: <input type="text" name="email" /></td></tr>
<tr><td>Password: <input type="password" name="password" /></td></tr>
<tr><td>Type: <input type="text" name="type" /></td></tr>

<tr><td><input type="submit" /></td></tr>

</table>
</form></html>


post.php

Code: [Select]
<?php

$sql="INSERT INTO users (id,fname, mname, lname, mobile, tel, address, job, company, nid, recruiteris, email, password, type)
VALUES
('','$_POST[fname]','$_POST[mname]','$_POST[lname]','$_POST[mobile]','$_POST[tel]','$_POST[address]','$_POST[job]','$_POST[company]','$_POST[nid]','$_POST[recruiteris]','$_POST[email]','$_POST[password]','$_POST[type]')";

if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }
echo "1 record added";
echo "<br />";
echo "<a href='http://waw-eg.com/admin/register.html'>Add More Client? Click Here</a><br/>";  
echo "<a href='http://waw-eg.com/admin/Users.php'>View Users Click Here</a>";

mysql_close($con)
?>

How can I check to see if a webpage exists with PHP.
for example http://www.google.com/ would be true
and http://fakeurl32939232.com/filepage.html = false
What function/syntax would I have to use?

I'm working with a registration/login system from a tutorial. It's got email validation to make sure it does not exist but I'm struggling to add the same to the username field:

Working code:

Code: [Select]
<?php

include ('database_connection.php');
if (isset($_POST['formsubmitted'])) {
    $error = array();//Declare An Array to store any error message  
    if (empty($_POST['name'])) {//if no name has been supplied 
        $error[] = 'Please Enter a name ';//add to array "error"
    } else {
        $name = $_POST['name'];//else assign it a variable
    }

    if (empty($_POST['e-mail'])) {
        $error[] = 'Please Enter your Email ';
    } else {


        if (preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/", $_POST['e-mail'])) {
           //regular expression for email validation
            $Email = $_POST['e-mail'];
        } else {
             $error[] = 'Your EMail Address is invalid  ';
        }


    }


    if (empty($_POST['Password'])) {
        $error[] = 'Please Enter Your Password ';
    } else {
        $Password = $_POST['Password'];
    }


    if (empty($error)) //send to Database if there's no error '

    { // If everything's OK...

        // Make sure the email address is available:
        $query_verify_email = "SELECT * FROM members  WHERE Email ='$Email'";
        $result_verify_email = mysqli_query($dbc, $query_verify_email);
        if (!$result_verify_email) {//if the Query Failed ,similar to if($result_verify_email==false)
            echo ' Database Error Occured ';
        }
    if (mysqli_num_rows($result_verify_email) == 0) { // IF no previous user is using this email .


            // Create a unique  activation code:
            $activation = md5(uniqid(rand(), true));


            $query_insert_user = "INSERT INTO `members` ( `Username`, `Email`, `Password`, `Activation`) VALUES ( '$name', '$Email', '$Password', '$activation')";


            $result_insert_user = mysqli_query($dbc, $query_insert_user);
            if (!$result_insert_user) {
                echo 'Query Failed ';
            }

            if (mysqli_affected_rows($dbc) == 1) { //If the Insert Query was successfull.


                // Send the email:
                $message = " To activate your account, please click on this link:\n\n";
                $message .= WEBSITE_URL . '/activate.php?email=' . urlencode($Email) . "&key=$activation";
                mail($Email, 'Registration Confirmation', $message, 'From: Admin@TheGameCo.Com');

                // Flush the buffered output.


                // Finish the page:
                echo '<div class="success">Thank you for
registering! A confirmation email
has been sent to '.$Email.' Please click on the Activation Link to Activate your account </div>';


            } else { // If it did not run OK.
                echo '<div class="errormsgbox">You could not be registered due to a system
error. We apologize for any
inconvenience.</div>';
            }

        } else { // The email address is not available.
            echo '<div class="errormsgbox" >That email
address has already been registered.
</div>';
        }

    } else {//If the "error" array contains error msg , display them
        
        

echo '<div class="errormsgbox"> <ol>';
        foreach ($error as $key => $values) {
            
            echo ' <li>'.$values.'</li>';


       
        }
        echo '</ol></div>';

    }
  
    mysqli_close($dbc);//Close the DB Connection

} // End of the main Submit conditional.



?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Game Name - Home</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>

<div id="container">
<div id="header">
<?php include("includes/header.php"); ?>
</div>
<div id="nav">
<?php include("includes/nav.php"); ?>

</div>
<div id="content">
<form action="index.php" method="post" class="registration_form">
  <fieldset>
    <legend>Registration Form</legend>

    <p>Create A new Account<br />Already a member? <a href="login.php">Log in</a></p>
   
    <div class="elements">
      <label for="name">Username:</label>
      <input type="text" id="name" name="name" size="25" />
    </div>
    <div class="elements">
      <label for="e-mail">E-mail:</label>
      <input type="text" id="e-mail" name="e-mail" size="25" />
    </div>
    <div class="elements">
      <label for="Password">Password:</label>
      <input type="password" id="Password" name="Password" size="25" />
    </div>
    <div class="submit">
     <input type="hidden" name="formsubmitted" value="TRUE" />
      <input type="submit" value="Register" />
    </div>
  </fieldset>
</form>
</div>
<div id="footer">
<?php include("includes/footer.php"); ?>
</div>
</div>
</body>
</html>


I've tried adding this after the email verification:

Code: [Select]
// Make sure the user is available:
        $query_verify_user = "SELECT * FROM members  WHERE Username ='$name'";
        $result_verify_user = mysqli_query($dbc, $query_verify_user);
        if (!$result_verify_user) {
            echo ' Database Error Occured ';
        }
}
    if (mysqli_num_rows($result_verify_user) == 0) { // IF no previous user is using this user .
But that just returns me with:

It works to stop username/email duplication but now returns:

Query Failed You could not be registered due to a system error. We apologize for any inconvenience.

Not sure where I'm going wrong tbh.