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Adding value to url string

Lassie

By Lassie
in PHP Coding Help

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Lassie Advanced Member

Lassie

Posted
Posted

I have a page which displays books in a selected category.The selected category is passed in the url. When a thumbnail is selected a larger image and book deatils are shown

I want to display a limited no of books and use a prev and next link to allow all to be shown.

To do this the page use SERVER_SELF.

I have 2 problems.

1. When I select a thumbnail for the full details to be shown I loose the cat id as it is passed in the Get method.

2. I have tried adding the cat id to the prev and next links but this produces a parse error.

I think I will also have to amend the thumbnail link.

 

Is what I am trying to do possible and how do I correct the syntax.

 

The parse error lines are below followed by the script.

echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage-1).'&cat_id='.($row['cat_id']).">< Prev</a>';

[code]

echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).">Next ></a>';

[code]

<?php
include ('book_sc_fns.php');
  // The shopping cart needs sessions, so start one
  session_start();
  do_html_header();
  
  				$cat_id = $_GET['cat_id'];
  
  				$name = get_category_name($cat_id);
  				
  
  		//define number of cols in the table
  					define('COLS',2);
  				//set maxium number of records per page
  					define('SHOWMAX',9);
  				
  					
  				//connect to db
  				$connection = db_connect();
  			//	$cat_id=12;
  				
  				
  				//prepare sql to get total records
  				
  	$getTotal = "SELECT COUNT(*) as cnt FROM products WHERE cat_id='$cat_id'";
  	//sunbit query and store results as $totalPix
  	$total = mysql_query($getTotal) or die("Problem with the query: $getTotal<br>" . mysql_error());
  	$row = mysql_fetch_assoc($total);
  	$totalPix = $row['cnt'];
  				
  				
  				//set the current page
  				$curPage = isset($_GET['curPage']) ? $_GET['curPage'] : 0;
			// calculate the start row of the subset
			$startRow = $curPage * SHOWMAX;
  				
  				$query = "SELECT *
             			from products WHERE cat_id='$cat_id'LIMIT $startRow, ".SHOWMAX; 
  						$result = mysql_query($query)or die("Problem with the query: $query<br>" . mysql_error());
  						if (!$result)
  						return false;
  						$num_cats = mysql_num_rows($result);
  						if ($num_cats ==0)
  						return false;
  						$row = mysql_fetch_assoc($result);
  						
  					
  
	// get the name and caption for the main image
		$mainImage = $row['pix'];



		// get the name for the main image
			if(isset($_GET['image']))
			{
				$mainImage = $_GET['image'];
			}
			else{
				$mainImage = $row['pix'];
			}
	// get the dimensions of the main image
		$imageSize = getimagesize('images/'.$mainImage);


?>			
    		
        	<h1 class="align-center"><?php echo $name;?></h1>
        	<p id="picCount">Displaying <?php echo $startRow+1;
	  	if ($startRow+1 < $totalPix) 
		  {
	    echo ' to ';
		if ($startRow+SHOWMAX < $totalPix) {
		  echo $startRow+SHOWMAX;
		  }
		else {
		  echo $totalPix;
		  }
		}
	  	echo " of $totalPix";
	  ?></p>
	  	<div class="float-divider"></div>
  			<div id="gallery">
  			
            <table id="thumbs">
                <tr>
				<!--This row needs to be repeated-->

                    <?php
					//initialised cell counter outside loop
					$pos = 0;
				 do 
				{ 

				  // set caption if thumbnail is same as main image
	              if ($row['pix'] == $mainImage) 
				  	{
	                	$caption = $row['title'];
	                	$about=$row['product_desc'];
	                	
		            }

				 ?>
                    <td><a href="<?php echo $_SERVER['PHP_SELF']; ?>?image=<?php echo $row['pix']; ?>&curPage=<?php echo $curPage; ?>"><img src="images/<?php echo $row['pix']; ?>" alt="<?php echo $row['title']; ?>" width="80" height="54" /></a>
				</td>
                    <td class="thumbs"><?php echo $row['title'];?></td>
				<?php
				$row = mysql_fetch_assoc($result);
				//increment counter after next row extracted 
				$pos++;
	  			// if at end of row and records remain, insert tags
				if ($pos%COLS === 0 && is_array($row)) 
				{
	    		  echo '</tr><tr>';
				  }
	  			} while($row);  // end of loop
	  			// new loop to fill in final row
				while ($pos%COLS) 
				{
	    		  echo '<td> </td>';
				  $pos++;
			      }

				?>
                </tr>
			<!-- Navigation link needs to go here -->

			<td><?php
			    // create a back link if current page greater than 0
			    if ($curPage > 0) {
				  echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage-1).'&cat_id='.($row['cat_id']).">< Prev</a>';
				  }
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			    ?>
                    </td>
                    <?php
			    // pad the final row with empty cells if more than 2 columns
			    if (COLS-2 > 0) {
				  for ($i = 0; $i < COLS-2; $i++) {
				    echo '<td> </td>';
				    }
				  }
			    ?>
                    <td>
				<?php
			    // create a forwards link if more records exist
			    if ($startRow+SHOWMAX < $totalPix) {
				  echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).">Next ></a>';
				  }
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			    ?>
                    </td>
                </tr>
            	</table>
            	<div id="right">
            	<table width="350" align="center">
            	<tr>
            	<td colspan="2" align="center"><?php echo $caption; ?></td>
			</tr>
            	<tr>
            	<td>
                <p><img src="images/<?php echo $mainImage; ?>" alt="<?php echo $caption; ?>" <?php echo $imageSize[3]; ?> /></p>
			</td>
			<td><?php echo $about;?></td>
			</tr></table>
                
            </div>
        </div><!--End Div Gallery-->
    
    
    <?php
    
  	do_html_footer();
exit();
?>

[/code]

[/code]

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GKWelding Newbie

GKWelding

Posted
Posted

for a start, replace line 131 to 151 with the following...

 

if ($curPage > 0) {
echo "<a href=\"'.$_SERVER['PHP_SELF'].'?curPage='.($curPage-1).'&cat_id='.($row['cat_id']).\">< Prev</a>";
}
// otherwise leave the cell empty
else {
echo ' ';
}
?>
</td>
<?php
// pad the final row with empty cells if more than 2 columns
if (COLS-2 > 0) {
for ($i = 0; $i < COLS-2; $i++) {
echo '<td> </td>';
}
}
?>
<td>
<?php
// create a forwards link if more records exist
if ($startRow+SHOWMAX < $totalPix) {
echo "<a href=\"'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).\">Next ></a>";

 

Your echo quoting was screwed up, try that and then see what happens, I haven't reviewed all of the code yet but that was the obvious stuff.

 

EDIT: Making code more readable...

Lassie Advanced Member

Lassie

Posted
  • Author
Posted

Hi,

Full code below and thank you for your interest.

I have in this version error on 152.

Now 152 is the same code almost as 131 which doesnt give an error.

 


<?php
include ('book_sc_fns.php');
  // The shopping cart needs sessions, so start one
  session_start();
  do_html_header();
  
  				$cat_id = $_GET['cat_id'];
  
  				$name = get_category_name($cat_id);
  				
  
  		//define number of cols in the table
  					define('COLS',2);
  				//set maxium number of records per page
  					define('SHOWMAX',9);
  				
  					
  				//connect to db
  				$connection = db_connect();
  			//	$cat_id=12;
  				
  				
  				//prepare sql to get total records
  				
  	$getTotal = "SELECT COUNT(*) as cnt FROM products WHERE cat_id='$cat_id'";
  	//sunbit query and store results as $totalPix
  	$total = mysql_query($getTotal) or die("Problem with the query: $getTotal<br>" . mysql_error());
  	$row = mysql_fetch_assoc($total);
  	$totalPix = $row['cnt'];
  				
  				
  				//set the current page
  				$curPage = isset($_GET['curPage']) ? $_GET['curPage'] : 0;
			// calculate the start row of the subset
			$startRow = $curPage * SHOWMAX;
  				
  				$query = "SELECT *
             			from products WHERE cat_id='$cat_id'LIMIT $startRow, ".SHOWMAX; 
  						$result = mysql_query($query)or die("Problem with the query: $query<br>" . mysql_error());
  						if (!$result)
  						return false;
  						$num_cats = mysql_num_rows($result);
  						if ($num_cats ==0)
  						return false;
  						$row = mysql_fetch_assoc($result);
  						
  					
  
	// get the name and caption for the main image
		$mainImage = $row['pix'];



		// get the name for the main image
			if(isset($_GET['image']))
			{
				$mainImage = $_GET['image'];
			}
			else{
				$mainImage = $row['pix'];
			}
	// get the dimensions of the main image
		$imageSize = getimagesize('images/'.$mainImage);


?>			
    		
        	<h1 class="align-center"><?php echo $name;?></h1>
        	<p id="picCount">Displaying <?php echo $startRow+1;
	  	if ($startRow+1 < $totalPix) 
		  {
	    echo ' to ';
		if ($startRow+SHOWMAX < $totalPix) {
		  echo $startRow+SHOWMAX;
		  }
		else {
		  echo $totalPix;
		  }
		}
	  	echo " of $totalPix";
	  ?></p>
	  	<div class="float-divider"></div>
  			<div id="gallery">
  			
            <table id="thumbs">
                <tr>
				<!--This row needs to be repeated-->

                    <?php
					//initialised cell counter outside loop
					$pos = 0;
				 do 
				{ 

				  // set caption if thumbnail is same as main image
	              if ($row['pix'] == $mainImage) 
				  	{
	                	$caption = $row['title'];
	                	$about=$row['product_desc'];
	                	
		            }

				 ?>
                    <td><a href="<?php echo $_SERVER['PHP_SELF']; ?>?image=<?php echo $row['pix']; ?>&curPage=<?php echo $curPage; ?>"><img src="images/<?php echo $row['pix']; ?>" alt="<?php echo $row['title']; ?>" width="80" height="54" /></a>
				</td>
                    <td class="thumbs"><?php echo $row['title'];?></td>
				<?php
				$row = mysql_fetch_assoc($result);
				//increment counter after next row extracted 
				$pos++;
	  			// if at end of row and records remain, insert tags
				if ($pos%COLS === 0 && is_array($row)) 
				{
	    		  echo '</tr><tr>';
				  }
	  			} while($row);  // end of loop
	  			// new loop to fill in final row
				while ($pos%COLS) 
				{
	    		  echo '<td> </td>';
				  $pos++;
			      }

				?>
                </tr>
			<!-- Navigation link needs to go here -->

			<td><?php
			    // create a back link if current page greater than 0
			    if ($curPage > 0) {
				  echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage-1).'&cat_id='.($row['cat_id']).">< Prev</a>';
				  }
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			    ?>
			    </td>
			    <?php
			    // pad the final row with empty cells if more than 2 columns
			    if (COLS-2 > 0) {
				  for ($i = 0; $i < COLS-2; $i++) {
				    echo '<td> </td>';
				    }
				  }
			    ?>
                    <td>
				<?php
			    // create a forwards link if more records exist
			    if ($startRow+SHOWMAX < $totalPix) 
				{
				echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).">> Next</a>';
			 	}
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			?>
                    </td>
                </tr>
            	</table>
            	<div id="right">
            	<table width="350" align="center">
            	<tr>
            	<td colspan="2" align="center"><?php echo $caption; ?></td>
			</tr>
            	<tr>
            	<td>
                <p><img src="images/<?php echo $mainImage; ?>" alt="<?php echo $caption; ?>" <?php echo $imageSize[3]; ?> /></p>
			</td>
			<td><?php echo $about;?></td>
			</tr></table>
                
            </div>
        </div><!--End Div Gallery-->
    
    
    <?php
    
  	do_html_footer();
exit();
?>

GKWelding Newbie

GKWelding

Posted
Posted

ok, replace all of that code you just gave with this and see if that works...

 


<?php
include ('book_sc_fns.php');
  // The shopping cart needs sessions, so start one
  session_start();
  do_html_header();
  
  				$cat_id = $_GET['cat_id'];
  
  				$name = get_category_name($cat_id);
  				
  
  		//define number of cols in the table
  					define('COLS',2);
  				//set maxium number of records per page
  					define('SHOWMAX',9);
  				
  					
  				//connect to db
  				$connection = db_connect();
  			//	$cat_id=12;
  				
  				
  				//prepare sql to get total records
  				
  	$getTotal = "SELECT COUNT(*) as cnt FROM products WHERE cat_id='$cat_id'";
  	//sunbit query and store results as $totalPix
  	$total = mysql_query($getTotal) or die("Problem with the query: $getTotal<br>" . mysql_error());
  	$row = mysql_fetch_assoc($total);
  	$totalPix = $row['cnt'];
  				
  				
  				//set the current page
  				$curPage = isset($_GET['curPage']) ? $_GET['curPage'] : 0;
			// calculate the start row of the subset
			$startRow = $curPage * SHOWMAX;
  				
  				$query = "SELECT *
             			from products WHERE cat_id='$cat_id'LIMIT $startRow, ".SHOWMAX; 
  						$result = mysql_query($query)or die("Problem with the query: $query<br>" . mysql_error());
  						if (!$result)
  						return false;
  						$num_cats = mysql_num_rows($result);
  						if ($num_cats ==0)
  						return false;
  						$row = mysql_fetch_assoc($result);
  						
  					
  
	// get the name and caption for the main image
		$mainImage = $row['pix'];



		// get the name for the main image
			if(isset($_GET['image']))
			{
				$mainImage = $_GET['image'];
			}
			else{
				$mainImage = $row['pix'];
			}
	// get the dimensions of the main image
		$imageSize = getimagesize('images/'.$mainImage);


?>			
    		
        	<h1 class="align-center"><?php echo $name;?></h1>
        	<p id="picCount">Displaying <?php echo $startRow+1;
	  	if ($startRow+1 < $totalPix) 
		  {
	    echo ' to ';
		if ($startRow+SHOWMAX < $totalPix) {
		  echo $startRow+SHOWMAX;
		  }
		else {
		  echo $totalPix;
		  }
		}
	  	echo " of $totalPix";
	  ?></p>
	  	<div class="float-divider"></div>
  			<div id="gallery">
  			
            <table id="thumbs">
                <tr>
				<!--This row needs to be repeated-->

                    <?php
					//initialised cell counter outside loop
					$pos = 0;
				 do 
				{ 

				  // set caption if thumbnail is same as main image
	              if ($row['pix'] == $mainImage) 
				  	{
	                	$caption = $row['title'];
	                	$about=$row['product_desc'];
	                	
		            }

				 ?>
                    <td><a href="<?php echo $_SERVER['PHP_SELF']; ?>?image=<?php echo $row['pix']; ?>&curPage=<?php echo $curPage; ?>"><img src="images/<?php echo $row['pix']; ?>" alt="<?php echo $row['title']; ?>" width="80" height="54" /></a>
				</td>
                    <td class="thumbs"><?php echo $row['title'];?></td>
				<?php
				$row = mysql_fetch_assoc($result);
				//increment counter after next row extracted 
				$pos++;
	  			// if at end of row and records remain, insert tags
				if ($pos%COLS === 0 && is_array($row)) 
				{
	    		  echo '</tr><tr>';
				  }
	  			} while($row);  // end of loop
	  			// new loop to fill in final row
				while ($pos%COLS) 
				{
	    		  echo '<td> </td>';
				  $pos++;
			      }

				?>
                </tr>
			<!-- Navigation link needs to go here -->

			<td><?php
			    // create a back link if current page greater than 0
			    if ($curPage > 0) {
				echo "<a href=\"'.$_SERVER['PHP_SELF'].'?curPage='.($curPage-1).'&cat_id='.($row['cat_id']).\">< Prev</a>";
				}
				// otherwise leave the cell empty
				else {
				echo ' ';
				}
				?>
			</td>
				<?php
				// pad the final row with empty cells if more than 2 columns
				if (COLS-2 > 0) {
				for ($i = 0; $i < COLS-2; $i++) {
				echo '<td> </td>';
				}
				}
				?>
			<td>
				<?php
				// create a forwards link if more records exist
				if ($startRow+SHOWMAX < $totalPix) {
				echo "<a href=\"'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).\">Next ></a>";
			 	}
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			?>
                    </td>
                </tr>
            	</table>
            	<div id="right">
            	<table width="350" align="center">
            	<tr>
            	<td colspan="2" align="center"><?php echo $caption; ?></td>
			</tr>
            	<tr>
            	<td>
                <p><img src="images/<?php echo $mainImage; ?>" alt="<?php echo $caption; ?>" <?php echo $imageSize[3]; ?> /></p>
			</td>
			<td><?php echo $about;?></td>
			</tr></table>
                
            </div>
        </div><!--End Div Gallery-->
    
    
    <?php
    
  	do_html_footer();
exit();
?>

sasa Newbie

sasa

Posted
Posted

change lines

echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).">> Next</a>';

to

echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).'>> Next</a>';

change last " to ' in lines 132 and 153

Lassie Advanced Member

Lassie

Posted
  • Author
Posted

I now have a parse free script but my cat_id is not adding to the url.

I have verified that the $row['cat_id'] holds the category.

 

Can anyone help please.


<?php
			    // create a back link if current page greater than 0
			    if ($curPage > 0) 
				{
				  echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage-1).'&cat_id='. ($row['cat_id']).'">< Prev</a>';
				}
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			    ?>
                    </td>
                    <?php
			    // pad the final row with empty cells if more than 3 columns
			    if (COLS-2 > 0) 
				{
				  for ($i = 0; $i < COLS-2; $i++) 
				  {
				    echo '<td> </td>';
					}
				}
			    ?>
                    <td>
				<?php
			    // create a forwards link if more records exist
			    if ($startRow+SHOWMAX < $totalPix) 
				{
				  echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).'">Next ></a>';
				  }
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			    ?>
                    </td>
                </tr>
            	</table>

 

 

Full script

<?php
include ('book_sc_fns.php');
  // The shopping cart needs sessions, so start one
  session_start();
  do_html_header();
  				$cat_id=$_GET['cat_id'];
  				$name = get_category_name($cat_id);
  
  		//define number of cols in the table
  					define('COLS',2);
  				//set maxium number of records per page
  					define('SHOWMAX',9);
  					
  				//connect to db
  				$connection = db_connect();
  				
  				//prepare sql to get total records
  				$getTotal = "SELECT COUNT(*) as cnt FROM products WHERE cat_id='$cat_id'";
  				//sunbit query and store results as $totalPix
  				$total = mysql_query($getTotal)or die ("Problem with the query: $getTotal<br>" . mysql_error());
  				$row = mysql_fetch_assoc($total);
  				$totalPix = $row['cnt'];
  				
  				//set the current page
  				$curPage = isset($_GET['curPage']) ? $_GET['curPage'] : 0;
			// calculate the start row of the subset
			$startRow = $curPage * SHOWMAX;
  				
  				$query = "SELECT *
             			from products WHERE cat_id='$cat_id' LIMIT $startRow, ".SHOWMAX; 
  						$result = mysql_query($query)or die("Problem with query: $query<br>" . mysql_error());
  						if (!$result)
  						return false;
  						$num_cats = mysql_num_rows($result);
  						if ($num_cats ==0)
  						return false;
  						$row = mysql_fetch_assoc($result);
  
	// get the name and caption for the main image
		$mainImage = $row['pix'];


		// get the name for the main image
			if(isset($_GET['image']))
			{
				$mainImage = $_GET['image'];
			}
			else{
				$mainImage = $row['pix'];
			}
	// get the dimensions of the main image
		$imageSize = getimagesize('images/'.$mainImage);


?>			
    		
        	<h1 class="align-center"><?php echo $name;?></h1>
        	<p id="picCount">Displaying <?php echo $startRow+1;
	  	if ($startRow+1 < $totalPix) 
		  {
	    echo ' to ';
		if ($startRow+SHOWMAX < $totalPix) {
		  echo $startRow+SHOWMAX;
		  }
		else {
		  echo $totalPix;
		  }
		}
	  	echo " of $totalPix";
	  ?></p>
	  	<div class="float-divider"></div>
  			<div id="gallery">
  			
            <table id="thumbs" align="center">
                <tr>
				<!--This row needs to be repeated-->

                    <?php
					//initialised cell counter outside loop
					$pos = 0;
				 do 
				{ 

				  // set caption if thumbnail is same as main image
	              if ($row['pix'] == $mainImage) {
	                	$caption = $row['title'];
	                	
	                	$about=$row['product_desc'];
		            }

				 ?>
                    <td><a href="<?php echo $_SERVER['PHP_SELF']; ?>?image=<?php echo $row['pix']; ?>&curPage=<?php echo $curPage; ?>"><img src="images/<?php echo $row['pix']; ?>" alt="<?php echo $row['title']; ?>" width="80" height="54" /></a></td>
                    <td class="thumbs"><?php echo $row['title'];?></td>
				<?php
				$row = mysql_fetch_assoc($result);
				//increment counter after next row extracted 
				$pos++;
	  			// if at end of row and records remain, insert tags
				if ($pos%COLS === 0 && is_array($row)) 
				{
	    		  echo '</tr><tr>';
				  }
	  			} while($row);  // end of loop
	  			// new loop to fill in final row
				while ($pos%COLS) 
				{
	    		  echo '<td> </td>';
				  $pos++;
			      }

				?>
                </tr>
			<!-- Navigation link needs to go here -->

			<td><?php
			    // create a back link if current page greater than 0
			    if ($curPage > 0) 
				{
				  echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage-1).'&cat_id='. ($row['cat_id']).'">< Prev</a>';
				}
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			    ?>
                    </td>
                    <?php
			    // pad the final row with empty cells if more than 3 columns
			    if (COLS-2 > 0) 
				{
				  for ($i = 0; $i < COLS-2; $i++) 
				  {
				    echo '<td> </td>';
					}
				}
			    ?>
                    <td>
				<?php
			    // create a forwards link if more records exist
			    if ($startRow+SHOWMAX < $totalPix) 
				{
				  echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).'">Next ></a>';
				  }
			    // otherwise leave the cell empty
			    else {
				  echo ' ';
				  }
			    ?>
                    </td>
                </tr>
            	</table>
            	<div id="main_image">
            	<table align="center">
            	<tr>
            	<td colspan="2" align="center"><?php echo $caption; ?></td>
			</tr>
            	<tr>
            	<td>
                <p><img src="images/<?php echo $mainImage; ?>" alt="<?php echo $caption; ?>" <?php echo $imageSize[3]; ?> /></p>
			</td>
			<td><?php echo $about;?></td>
			</tr></table>
                
            </div>
        </div><!--End Div Gallery-->
    
    
    <?php
    
  	do_html_footer();
exit();
?>

sasa Newbie

sasa

Posted
Posted

you have extra space after &

change

echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'& cat_id='.($row['cat_id']).'">Next ></a>';

to

echo '<a href="'.$_SERVER['PHP_SELF'].'?curPage='.($curPage+1).'&cat_id='.($row['cat_id']).'">Next ></a>';

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