php - $error appears as an undefined variable -


so i've been working php on last couple weeks , new this. have made database in mysql , using php handle through web page. have made below code worked when entering data 1 of tables in database :

allows user create new entry in database  */      // creates new record form   // since form used multiple times in file, have made function reusable   function renderform($customer, $contactperson, $description, $manufacturer, $serialnumber, $category, $status, $start, $end, $delivered, $quotationreference, $amount, $customeraddr, $invoice, $remarks, $error)   {   ?>   <!doctype html public "-//w3c//dtd html 4.01//en" "http://www.w3.org/tr/html4/strict.dtd">   <html>   <head>      <meta charset="utf-8">      <title>new entry form</title>     <link rel="stylesheet" type="text/css" href="css/newstyle.css"     <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>    <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>        <script>    $(document).ready(function() {      $("#datepicker").datepicker();    });    </script>    </head>      <body>   <?php    // if there errors, display them   if ($error != '')   {   echo '<div style="padding:4px; border:1px solid white; color:white;">'.$error.'</div>';   }   ?>    <span href="#" class="button" id="toggle-login">new entry</span>         <div id="login">    <div id="triangle"></div>    <h1>add details</h1>   <form action="" method="post">       <input type="text" placeholder="customer*" name="customer" value="<?php echo $customer; ?>"/>      <input type="text" placeholder="customer address" name="customeraddr" value="<?php echo $customeraddr; ?>"/>      <input type="text" placeholder="contact person*" name="contactperson" value="<?php echo $contactperson; ?>"/>      <input type="text" placeholder="description*" name="description" value="<?php echo $description; ?>"/>      <input type="text" placeholder="manufacturer*" name="manufacturer" value="<?php echo $manufacturer; ?>"/>      <input type="text" placeholder="serial number" name="serialnumber" value="<?php echo $serialnumber; ?>"/>      <input type="text" placeholder="category" name="category" value="<?php echo $category; ?>"/>      <input type="text" placeholder="status*" name="status" value="<?php echo $status; ?>"/>      <input placeholder="start date" class="textbox-n" type="text" onfocus="(this.type='date')"  id="start" name="start" value="<?php echo $start; ?>">       <input placeholder="end date" class="textbox-n" type="text" onfocus="(this.type='date')"  id="end" name="end" value="<?php echo $end; ?>">       <input placeholder="delivered date" class="textbox-n" type="text" onfocus="(this.type='date')"  id="delivered" name="delivered" value="<?php echo $delivered; ?>">       <!--<input type="date" placeholder="start date" />      <input type="date" placeholder="end date" />      <input type="date" placeholder="delivered date" />-->      <input type="text" placeholder="quotation reference" name="quotationreference" value="<?php echo $quotationreference; ?>"/>      <input type="text" placeholder="amount" name="amount" value="<?php echo $amount; ?>"/>      <input type="text" placeholder="invoice" name="invoice" value="<?php echo $invoice; ?>"/>      <input type="textarea" rows=4 cols=20 placeholder="remarks" name="remarks" value="<?php echo $remarks; ?>"/>      <!--<input type="submit" value="add entry" />-->      <input type="submit" name="submit" value="submit">    </form>      </div>   </form>    </body>   </html>   <?php    }              // connect database   include('connect-db.php');      // check if form has been submitted. if has, start process form , save database   if (isset($_post['submit']))   {    // form data, making sure valid   $customer = mysqli_real_escape_string($connection, htmlspecialchars($_post['customer']));   $contactperson = mysqli_real_escape_string($connection, htmlspecialchars($_post['contactperson']));   $description = mysqli_real_escape_string($connection, htmlspecialchars($_post['description']));   $manufacturer = mysqli_real_escape_string($connection, htmlspecialchars($_post['manufacturer']));   $serialnumber = mysqli_real_escape_string( $connection, htmlspecialchars($_post['serialnumber']));   $category = mysqli_real_escape_string( $connection, htmlspecialchars($_post['category']));   $status = mysqli_real_escape_string( $connection, htmlspecialchars($_post['status']));   $end = mysqli_real_escape_string( $connection, htmlspecialchars($_post['end']));   $delivered = mysqli_real_escape_string( $connection, htmlspecialchars($_post['delivered']));   $start = mysqli_real_escape_string( $connection, htmlspecialchars($_post['start']));   $quotationreference = mysqli_real_escape_string($connection, htmlspecialchars($_post['quotationreference']));   $amount = mysqli_real_escape_string($connection, htmlspecialchars($_post['amount']));   $customeraddr = mysqli_real_escape_string($connection, htmlspecialchars($_post['customeraddr']));   $invoice = mysqli_real_escape_string($connection, htmlspecialchars($_post['invoice']));   $remarks = mysqli_real_escape_string($connection, htmlspecialchars($_post['remarks']));     // check make sure both fields entered   if ($customer == '' || $contactperson == '' || $description == '' || $manufacturer == '' || $status == '')   {   // generate error message   $error = 'error: please fill in required fields!';      // if either field blank, display form again   renderform($customer, $contactperson, $description, $manufacturer, $serialnumber, $category, $status, $start, $end, $delivered, $quotationreference, $amount, $customeraddr, $invoice, $remarks, $error);   }   else   {   	$q=  "insert brdatabase (customer, contactperson , description, manufacturer , serialnumber, category , status, start, end , delivered , quotationreference, amount , customeraddr, invoice, remarks) values ('$customer', '$contactperson', '$description', '$manufacturer', '$serialnumber', '$category', '$status', '$start', '$end', '$delivered', '$quotationreference', '$amount', '$customeraddr', '$invoice', '$remarks') ";    if(mysqli_query($connection, $q))    {      // once saved, redirect view page      header("location: index.php");     }  	else  	{  		echo "error : data cannot submitted";      renderform('','','','','','','','','','','','','','','','','','');  	} 	     }   }   	   else   // if form hasn't been submitted, display form   {   renderform('','','','','','','','','','','','','','','','','','');   }    ?>

though code works perfectly, below code based off above code seems give me error don't know how tackle.

<?php  /*    newcomp.php   allows user create new entry in database  */      // creates new record form   // since form used multiple times in file, have made function reusable   function renderform($component, $manufacturer, $vendor, $cost)   {   ?>   <!doctype html public "-//w3c//dtd html 4.01//en" "http://www.w3.org/tr/html4/strict.dtd">   <html>   <head>      <meta charset="utf-8">      <title>new entry form</title>     <link rel="stylesheet" type="text/css" href="css/newstyle.css"     <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>    <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>        <!--    <script>    $(document).ready(function() {      $("#datepicker").datepicker();    });    </script>    </head>    -->     <body>   <?php    // if there errors, display them   if ($error != '')   {   echo '<div style="padding:4px; border:1px solid white; color:white;">'.$error.'</div>';   }   ?>    <span href="#" class="button" id="toggle-login">new entry</span>         <div id="login">    <div id="triangle"></div>    <h1>add details</h1>   <form action="" method="post">       <input type="text" placeholder="component*" name="component" value="<?php echo $component; ?>"/>      <input type="text" placeholder="manufacturer*" name="manufacturer" value="<?php echo $manufacturer; ?>"/>      <input type="text" placeholder="vendor*" name="vendor" value="<?php echo $vendor; ?>"/>      <input type="text" placeholder="cost*" name="cost" value="<?php echo $cost; ?>"/>      <input type="submit" name="submit" value="submit">    </form>      </div>   </form>    </body>   </html>   <?php    }              // connect database   include('connect-db.php');      // check if form has been submitted. if has, start process form , save database   if (isset($_post['submit']))   {    // form data, making sure valid   $component = mysqli_real_escape_string($connection, htmlspecialchars($_post['component']));   $manufacturer = mysqli_real_escape_string($connection, htmlspecialchars($_post['manufacturer']));   $vendor = mysqli_real_escape_string($connection, htmlspecialchars($_post['vendor']));   $cost = mysqli_real_escape_string($connection, htmlspecialchars($_post['cost']));     // check make sure both fields entered   if ($component == '' || $manufacturer == '' || $vendor == '' || $cost == '')   {   // generate error message   $error = 'error: please fill in required fields!';      // if either field blank, display form again   renderform($component, $manufacturer, $vendor, $cost);   }   else   {   	$q=  "insert compdatabase (component, manufacturer, vendor, cost) values ('$component', '$manufacturer', '$vendor', '$cost') ";    if(mysqli_query($connection, $q))    {      // once saved, redirect view page      header("location: pricelist.php");     }  	else  	{  		echo "error : data cannot submitted";      renderform('','','','');  	} 	     }   }   	   else   // if form hasn't been submitted, display form   {   renderform('','','','');   }    ?>

i receive error " undefined varable @ line 34" contains if statement ($error != '') condition. unclear how fix $error. appreciate advice , help. still new php , hope of these doubts sorted out

<?php  /*    newcomp.php   allows user create new entry in database  */      // creates new record form   // since form used multiple times in file, have made function reusable   function renderform($component, $manufacturer, $vendor, $cost)   {   ?>   <!doctype html public "-//w3c//dtd html 4.01//en" "http://www.w3.org/tr/html4/strict.dtd">   <html>   <head>      <meta charset="utf-8">      <title>new entry form</title>     <link rel="stylesheet" type="text/css" href="css/newstyle.css"     <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css"/>    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>    <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>        <!--    <script>    $(document).ready(function() {      $("#datepicker").datepicker();    });    </script>    </head>    -->     <body>      <span href="#" class="button" id="toggle-login">new entry</span>         <div id="login">    <div id="triangle"></div>    <h1>add details</h1>   <form action="" method="post">       <input type="text" placeholder="component*" name="component" value="<?php echo $component; ?>"/>      <input type="text" placeholder="manufacturer*" name="manufacturer" value="<?php echo $manufacturer; ?>"/>      <input type="text" placeholder="vendor*" name="vendor" value="<?php echo $vendor; ?>"/>      <input type="text" placeholder="cost*" name="cost" value="<?php echo $cost; ?>"/>      <input type="submit" name="submit" value="submit">    </form>      </div>   </form>    </body>   </html>   <?php    }              // connect database   include('connect-db.php');      // check if form has been submitted. if has, start process form , save database   if (isset($_post['submit']))   {    // form data, making sure valid   $component = mysqli_real_escape_string($connection, htmlspecialchars($_post['component']));   $manufacturer = mysqli_real_escape_string($connection, htmlspecialchars($_post['manufacturer']));   $vendor = mysqli_real_escape_string($connection, htmlspecialchars($_post['vendor']));   $cost = mysqli_real_escape_string($connection, htmlspecialchars($_post['cost']));  $error = '';     // check make sure both fields entered   if ($component == '' || $manufacturer == '' || $vendor == '' || $cost == '')   {   // generate error message   $error = 'error: please fill in required fields!';      // if either field blank, display form again   renderform($component, $manufacturer, $vendor, $cost);   }   else   {   	$q=  "insert compdatabase (component, manufacturer, vendor, cost) values ('$component', '$manufacturer', '$vendor', '$cost') ";    if(mysqli_query($connection, $q))    {      // once saved, redirect view page      header("location: pricelist.php");     }  	else  	{  		echo "error : data cannot submitted";      renderform('','','','');  	} 	     }   }   	   else   // if form hasn't been submitted, display form   {   renderform('','','','');   }    ?>    <?php        // if there errors, display them       if ($error != '')       {       echo '<div style="padding:4px; border:1px solid white; color:white;">'.$error.'</div>';       }       ?>


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