Simple image display with PHP using regex...

[jch02140]

Hi,

I have upload a lot of images with filenames such as:

• vvvv_th.jpg
• airr_th.jpg
• 4vor_th.jpg
• mo40_th.jpg

...

basically the filenames is represent in regular expression is

http://www.domain.com/path/[a-z0-9]{4}_th.jpg

I am trying to do a simple display script of 10 per row. However, I am not sure how to do it with PHP... if someone can help me out would be greatly appreciated.

[descalzo]

<?php

 // split the path in two since I use the second half later
$doc_root = '/home/cPanelUsername/public_html' ; 
$image_dir = '/images/goats/' ;

$image_dir_path = $doc_root . $image_dir  ;

// open a handle to the directory
$dir_handle = opendir( $image_dir_path );  

// initialize counter and the display string
$count = 0 ;
$display = '' ;

// read one file name at a time
while( $filename = readdir($dir_handle)){
  
// just the files that match your pattern
  if( preg_match( '/$[a-z0-9]{4}_th\.jpg$/' , $filename ) ){
    // add to display string...can add 'Alt' tag 
     $display .= " <img src='$image_dir$filename' /> " ;
    
     $count++ ;  
     // every 10 images, reset counter and add <br /> tag
     if( $count % 10 == 0 ){
        $count=0;
        $display .= "<br />";
     }
  }

}

// clean up
closedir( $dir_handle );

echo $display ; 

?>

[elcrimer81]

     $display .= " <img src='$image_dir$filename' /> " ;

?> 

1-u can't use vars inside single-quotes
instead close the double-quotes and use the append operator "."
2-specify the image's width or use divs to display the images.

[descalzo]

1-u can't use vars inside single-quotes
instead close the double-quotes and use the append operator "."
2-specify the image's width or use divs to display the images.

1. The variable is ultimately inside double quotes, that is all that matters. The code works.

2. If all the images have the same width, fine. Your can hard code it. Otherwise you need more coding to find the width. For a 'simple display script', I did not think it was worth the time.
As for <div>, I just gave a quick outline of the script. He can fiddle with HTML and maybe style sheets later.

[misson]

If there aren't any files that match /[^a-z0-9]{4}_th.jpg/, you can also use glob to get the files:

...
foreach (glob($image_dir_path . '/????_th.jpg') as $filename) {
   ...  
} 

This does away with opendir, readdir and preg_match.

[jch02140]

Thanks for all the help

Just curious, if I am to put this script in a different server would the script be something like this?

 <?php

 // split the path in two since I use the second half later
$image_dir = '<remote server>' ;

// open a handle to the directory
$dir_handle = opendir( $image_dir );  

// initialize counter and the display string
$count = 0 ;
$display = '' ;

// read one file name at a time
while( $filename = readdir($dir_handle)){
  
// just the files that match your pattern
  if( preg_match( '/$[a-z0-9]{4}_th\.jpg$/' , $filename ) ){
    // add to display string...can add 'Alt' tag 
     $display .= " <img src='$image_dir$filename' /> " ;
    
     $count++ ;  
     // every 10 images, reset counter and add <br /> tag
     if( $count % 10 == 0 ){
        $count=0;
        $display .= "<br />";
     }
  }

}

// clean up
closedir( $dir_handle );

echo $display ; 

?>

[misson]

Only if you use an FTP URL and allow_url_fopen is enabled. Filesystem functions can only access objects that are, well, accessible via the filesystem. You wouldn't expect opendir to work with databases, would you? Fortunately for you, PHP's opendir has been extended to work with FTP. You could add support for HTTP URLs by writing your own stream wrapper, but it would only work if the resource named by the URL had a well-defined format, such as remote directorys when the server has directory listing enabled or if the server supported WebDAV or AtomPUB.

Other than that, you'd need a script on the remote server to generate a directory listing and send it in a data interchange format (e.g. JSON or XML).