DaniWeb Forum Index > Web Development > PHP

Display output on webpage

Please support our PHP advertiser: PostgreSQL or MySQL? Compare and contrast the two most popular open source databases

•

Join Date: Mar 2005

Posts: 30

Reputation: crestaldin is an unknown quantity at this point

Solved Threads: 0

crestaldin crestaldin is offline

Offline

Light Poster

Display output on webpage

Feb 18th, 2007

Hello all,
I'm a PHP newbie and have my apache Server and PHP in place. I have been able to run simple programs that work well. However, since then when I do "http ://localhost/filename.php" I either get 2 messages.
1. An error message if there's an error in my code
2. A blank page if I don't get an error message.

For example, the code below gives a blank screen. Pls help me with this.

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
    <?php
    $pictures = array('PixsIMG_0037.jpg','PixsIMG_0038.jpg','PixsIMG_0039.jpg
    ','PixsIMG_0040.jpg');
 
    shuffle($pictures);
    ?> 
 
 
 
<html>
<head>
	<title>Doe Cafe</title>
</head>
<body>
  <center>
     <h1>Doe Cafe</h1>
     <table width = '100%' >
      <tr>
 
 
    <?php
    for( $i = 0; $i < 3; $i++)
     {
         echo '<td align="center"><img src =" ';
        // echo $pictures[$i];
         echo $i;
         echo ' "width ="100" height ="100"></td>;
    }
    <?
 
  </tr>
  </table>
 </center>
 </body>
</html>
 
    <?php
    $pictures = array('PixsIMG_0037.jpg','PixsIMG_0038.jpg','PixsIMG_0039.jpg
    ','PixsIMG_0040.jpg');

    shuffle($pictures);
    ?> 

 

<html>
<head>
	<title>Doe Cafe</title>
</head>
<body>
  <center>
     <h1>Doe Cafe</h1>
     <table width = '100%' >
      <tr>

    
    <?php
    for( $i = 0; $i < 3; $i++)
     {
         echo '<td align="center"><img src =" ';
        // echo $pictures[$i];
         echo $i;
         echo ' "width ="100" height ="100"></td>;
    }
    <?

  </tr>
  </table>
 </center>
 </body>
</html>

•

Join Date: Sep 2006

Posts: 57

Reputation: GliderPilot is an unknown quantity at this point

Solved Threads: 2

GliderPilot GliderPilot is offline

Offline

Junior Poster in Training

Re: Display output on webpage

Feb 19th, 2007

There is many errors in your PHP statement thats in the body of your page which I will explain below. Try somthing like this:

 Help with Code Tags 
 php Syntax (Toggle Plain Text) 
 
<?php
 
  for( $i = 0; $i < 4; $i++)
  {
 
    echo "<td align='center'><img src='" . $pictures[$i] . "' width='100' height='100' alt='" . $i . "'></td>";
 
  }
 
?>
 
<?php
 
  for( $i = 0; $i < 4; $i++)
  {
 
    echo "<td align='center'><img src='" . $pictures[$i] . "' width='100' height='100' alt='" . $i . "'></td>";
 
  }
 
?>

Your errors were here:

- Your if statment will only display 3 photos while there is 4 in your array. You can either change the number to test for to 4, or change your tester to less than or equal to .... <=.

- You commented out the part that places the picture filename into the image tag. (the // makes PHP ignore it.)

-You put the value of $i in the src part of your image tag.

- You did not close the third echo after the </td> tag

- Your PHP closing tag is backwards. Should be ?>

Last edited by GliderPilot; Feb 19th, 2007 at 5:10 pm.

-Chris

http://www.etyn.com

•

Join Date: Mar 2005

Posts: 30

Reputation: crestaldin is an unknown quantity at this point

Solved Threads: 0

crestaldin crestaldin is offline

Offline

Light Poster

Re: Display output on webpage

Feb 23rd, 2007

•

Originally Posted by GliderPilot

There is many errors in your PHP statement thats in the body of your page which I will explain below. Try somthing like this:
Help with Code Tags

php Syntax (Toggle Plain Text)
 
<?php
 
  for( $i = 0; $i < 4; $i++)
  {
 
    echo "<td align='center'><img src='" . $pictures[$i] . "' width='100' height='100' alt='" . $i . "'></td>";
 
  }
 
?>
<?php for( $i = 0; $i < 4; $i++) { echo "<td align='center'><img src='" . $pictures[$i] . "' width='100' height='100' alt='" . $i . "'></td>"; } ?>
Your errors were here:

- Your if statment will only display 3 photos while there is 4 in your array. You can either change the number to test for to 4, or change your tester to less than or equal to .... <=.

- You commented out the part that places the picture filename into the image tag. (the // makes PHP ignore it.)

-You put the value of $i in the src part of your image tag.

- You did not close the third echo after the </td> tag

- Your PHP closing tag is backwards. Should be ?>

First I want to thank you for pointing out my errors, but I also have a question for you.
How do I see what errors I have with my PHP codes?(I mean is there like something similar to a debug window where errors and / or lines where they are will be displayed for my PHP codes)

Thanks

•

Join Date: Oct 2006

Posts: 232

Reputation: Rhyan is an unknown quantity at this point

Solved Threads: 24

Rhyan

Offline

Posting Whiz in Training

Re: Display output on webpage

Feb 28th, 2007

•

Originally Posted by crestaldin

First I want to thank you for pointing out my errors, but I also have a question for you.
How do I see what errors I have with my PHP codes?(I mean is there like something similar to a debug window where errors and / or lines where they are will be displayed for my PHP codes)

Thanks

PHP points the erroneus lines in your code, but you have to understand very well the code in order to debug. E.G. there is a difference between things like echo '$var' and echo "$var".

If you want to see errors, you have to modify your php.ini file to show the errors along with the code on the page, or, you can review the apache error log - it contains all errors occured in the PHP code.
Note errors are similar to this :

Error: Unexpected T_VARIABLE , expecting ',' or ';' on line 65 in "C:\php\my_php_file.php"