PHP - Can't Resize Large Images With Imagecreatefromjpeg()

In the past, whenever I write an image upload script in php that needs to generate a thumbnail or resized version, I have had to make sure the image is a reasonable size before uploading otherwise you get the old 'allowed memory bytes exceeded' thing.

What are my options if I want people to be able to upload a full size image from their camera i.e. a 15-20mb 4000x3000px image and then have a thumbnail and something like 500px wide version for displaying on the site? The large unaltered original needs to be stored as well as it will be used for prints.

Is this just not possible with PHP? Or is it down to needing a dedicated server?

I'm hoping to get a little feedback on what you all believe is the best way to handle this efficiently in PHP. I am working on a script that imports a large amount of data from remote feeds; this facilitates the quick deployment of real estate web sites, but has to download a large number of images to each new site.

Assuming for right now that the bottleneck isn't in the method (fsock vs curl vs...) and that for each imported listing we're spending between .89439 and 17.0601 seconds on the image import process alone... what would you suggest for handling this over the space of 100-1000 occurrences?

As of right now I have two ideas in mind, both fairly rudimentary in nature. The first idea is to shut the script down every 30-45 seconds, sleep for a second and fire off another asynchronous request to start the script again. The second idea is to fire off a new asynchronous to run the image imports separate from the main script. This would let the efficient ones clear out rather quickly while the slower imports would have their own process to run in. The only thing that worries me about this is the fact that 100 of these could be fired off every second. Even assuming half of them complete before the next round are fired off, they would still pile up.

Hi guys, i have a form that uploads a school photo.

All i want to do is resize the image to its widest dimension of a width of 480 px and then obviously constrain the height.

can anyone help me, ive tried to do this myself but when it comes to image properties i really struggle etc.

heres my upload code.

Code: [Select]
<?php
    include("includes/connection.php");

    // Where the file is going to be placed 
    $schoolimage = "SchoolImages/";
    
    //This path will be stored in the database as it does not contain the filename
    $currentdir = getcwd();
    $path = $currentdir . '/' . $schoolimage;
    
    // Get the schoolid for the image and school linker table
    $schoolid = $_POST['schoolid'];
    
    //Get the school name
    $query = "SELECT * FROM school WHERE school_id = ".$schoolid;
    $result = mysql_query($query) 
        or die("Error getting school details");
    $row = mysql_fetch_assoc($result);
    $schoolname = $row['name']; 
        
    //Use this path to store the path of the file in the database.
    $filepath = $schoolimage . $schoolname;
    
    
    //Create the folder if it does not already exist
    if(!file_exists('SchoolImages'))
    {
        if(mkdir('SchoolImages'))
        {
            echo 'Folder ' . 'SchoolImages' . ' created.';
        }
        else
        {
            echo 'Error creating folder ' . 'SchoolImages';
        }
    }
    
    
    //Store the folder for the course title.
    if(!file_exists( $filepath ))
    {
        if(mkdir( $filepath ))
        {
            echo 'Folder ' . $schoolname . ' created.';
        }
        else
        {
            echo 'Error creating folder ' . $schoolname;
        }
    }
    
    
    // Where the file is going to be placed 
    $target_path = $filepath;
    
    // Add the original filename to our target path. Result is "uploads/filename.extension"
    echo $target_path = $target_path . '/' . basename( $_FILES['uploadedfile']['name']); 
    
    if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) 
    {
        echo "The file ".  basename( $_FILES['uploadedfile']['name'])." has been uploaded";
        $filename =  $_FILES['uploadedfile']['name'];
        
        //Store the filename, path other criteria in the database 
        echo $query = "INSERT INTO image(image_id, name, path)
        VALUES(0, '$filename', '$filepath')";
        
        //Perform the query
        $add = mysql_query($query, $conn)
            or die("Unable to add the image details to the database");
        $imageid = mysql_insert_id();
        
        //Store the filename, path other criteria in the database 
        echo $query = "INSERT INTO image_school( image_id, school_id )
        VALUES('$imageid', '$schoolid')";
        
        //Perform the query
        $add = mysql_query($query, $conn)
            or die("Unable to add the image details to the database");
        
        $message = 'Upload Successful';
    } 
    else
    {    
        $message = 'There was an error uploading the file, please try again!';
    }
    
    //Close the connection to the database    
    mysql_close($conn);
    header("Location: add_school_photo_form.php? message={$message}&schoolid={$schoolid}");
    //header("Location: add_school_photo_form.php? message=$message, schoolid=$schoolid");
    exit();
    
?>
Id be eternially gratefull.

Kind Regards

Dean

Hey,


I was wondering if there is a way to use PHP to resize images when they are a above a size limit?


Im not referring to file size here, but rather the width by height ratio. As currently i upload images and echo them with:


Code: [Select]
style="width:250px;height:200px;"

But this means my server is loading large images when i would rather resize them down upon upload to reduce loading times...


Is this possible in php ?

After working with the sample imagecreatefromjpeg provided in the PHP manual, I successfully got a result (after clearing my cache) from

Quote

imagecreatefromjpeg($im, $file);

I've gotten a good education after navigating this function over the past week, and loaded it with ECHO messages to give me insight.

Everything was going fine.

And then, this ONE test image came along.

Apparently, the image (which is as good aj peg as I can find) FAILS the if(!im) test.

When I used echo $im;  

i discovered that when images pass through the function, they receive a "Resource" name.

Images that FAIL are NOT named.

This image gets a Resource name, yet FAILS. Is there a problem with my logic? A problem with the image? What would cause this? How can I verify?