image check

[DanielBP]

<table border="1">
<tr>
<th>ID</th>
<th>Image</th>
</tr>

<?php

for($i=0; $i<=100; $i++)
{
$url = 'http://localhost/images/icon_'.$i.'_64x64.jpg';
echo "<tr><td>".$i."</td><td><img src='".$url."' /></td></tr>";

}

?>

</table>

 

So after testing this script, I get empty cells in the table if the image doesn't exist. Can someone show me how to make it display only the images that exists in that folder ?

[xyph]

Perhaps using an if/then statement combined with file_exists()

 

http://php.net/manual/en/function.file-exists.php

[QuickOldCar]

<table border="1">
<tr>
<th>ID</th>
<th>Image</th>
</tr>

<?php

for($i=0; $i<=100; $i++)
{
$url = 'http://localhost/images/icon_'.$i.'_64x64.jpg';
         if (file_exists($url)) {
 echo "<tr><td>".$i."</td><td><img src='".$url."' /></td></tr>";
         }
}

?>

</table>

[PFMaBiSmAd]

how to make it display only the images that exists in that folder ?

 

Use glob to get a list of the images into an array and then simply iterate over the elements of that array and output the links/<img > tags for each image.

[DanielBP]

@QuickOldCar already tried that, it doesn't work

[xyph]

Use glob to get a list of the images into an array and then simply iterate over the elements of that array and output the links/<img > tags for each image.

 

This is the best solution if your folder ONLY contains the images you want to echo.

 

If it contains more, use file_exists

 

It would be more efficient to create a folder just for those images and use PFMaBiSmAd's solution.

[ninjeh]

@QuickOldCar already tried that, it doesn't work

 

You definitely would want a local solution instead of having to make 100 requests per page unless this is for some script that is used as a cron once in a while etc.

 

You could use curl to grab the http header of the resource.

 

<?php

function get_headers($url_to_check)
{
$ch = curl_init($url_to_check);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); 
curl_setopt($ch, CURLOPT_HEADER, TRUE);
curl_setopt($ch, CURLOPT_NOBODY, TRUE); 
curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
}
?>


<table border="1">
<tr>
<th>ID</th>
<th>Image</th>
</tr>

<?php
for($i=0; $i<=100; $i++)
{
$url = 'http://localhost/images/icon_'.$i.'_64x64.jpg';
if (get_headers($url) == 200) {
	echo "<tr><td>".$i."</td><td><img src='".$url."' /></td></tr>";
}
}
?>

</table>

 

 

Alternatively, if it is really localhost, reference the image through the file structure instead of using a URL.  Then use is_file as it would be much quicker than making the aforementioned http requests.

 

[ninjeh]

Oops, forgot to add return $httpcode; to the last line of the function.

[codefossa]

$url = 'http://blogs.pcworld.com/staffblog/archives/Seth%20MacFarlane-Family-Guy.jpg';

if (@getImageSize($url))
{
    echo "<img src='$url' />";
}
else
{
    echo 'not an image';
}

[PFMaBiSmAd]

Or simply -

<?php
$files = glob('images/icon_*_64x64.jpg');
foreach($files as $file){
$url = "http://localhost/$file";
echo "<tr><td><img src='".$url."' /></td></tr>";
}

[DanielBP]

@PFMaBiSmAd - It doesn't work, it shows only the ID/Image cells, nothing more

 

Found a solution:

for($i=0; $i<=100; $i++)
{
$url = 'http://localhost/images/icon_'.$i.'_64x64.jpg';
        if (@fclose(@fopen($url, "r"))) {
echo "<tr><td>".$i."</td><td><img src='".$url."' /></td></tr>";
            }
}

 

The only problem is, I have ~70-80 icons in that folder and it takes forever to see the result. But it does skip the files that don't exist.

[PFMaBiSmAd]

file_exists expects the file system path/name to the file. It only works with a URL using a couple of protocols and the http protocol is NOT one that it works with. You would need to use file_exists on the path/name to the file before you form a URL from that path/name.

 

If the code I suggested actually formed a table with a row for each image but didn't display the images, then the actual path to where the images are at and where your script is running at it isn't what you implied in the $url value you showed in the initial post.