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As a TimThumb user, making changes to the settings has always been a bit of a pain. It’s possible, of course, but if you make changes – and then want to update the script – then you have to make all the changes again.
To try and combat this, one of the things we did when creating TimThumb 2.0 is introduce a config file. This is a file that you can add to the same directory as timthumb.php, and use it to override the built in settings.
The file should be called timthumb-config.php and would contain a series of defines that change the default settings. The file is a PHP file and so should contain PHP code – I will add a small example at the bottom of this page.
There are a whole bunch of settings that are not controlled by the normal query string parameters.
|constant||values||What it does|
|DEBUG_ON||true/ false||Turn on debug logging to the standard PHP error log|
|DEBUG_LEVEL||1, 2, 3||Debug level 1 is less noisy and level 3 is the most noisy|
|MEMORY_LIMIT||30M||Set the PHP Memory Limit (30M = 30 Megabytes). Higher numbers means larger images can be resized, but also uses more server resources so may slow down your website|
|BLOCK_EXTERNAL_LEECHERS||true, fale||Stop external websites from linking to you and display ‘no linking’ image instead|
|ALLOW_EXTERNAL||true/ false||Allow images from external sites to be resized. Restricted to the images defined in the $allowed_sites array.|
|ALLOW_ALL_EXTERNAL_SITES||true/ false||Allow external images to be resized from ANY website. Note that this could be less secure!|
|FILE_CACHE_ENABLED||true/ false||Should we cache the files on disk to speed up your website? (hint: the answer is yes, unless you’re testing/ developing things! :))|
|FILE_CACHE_TIME_BETWEEN_CLEANS||86400 (milliseconds)||TimThumb automatically cleans up the cached files. This defines the amount of time between the different the cache cleaning.|
|FILE_CACHE_MAX_FILE_AGE||86400 (milliseconds)||How old should a file be before it’s cleaned?|
|FILE_CACHE_SUFFIX||.timthumb.txt||What to put at the end of all files in the cache directory so we can identify them easily|
|FILE_CACHE_PREFIX||timthumb||What to put at the start of the cache files so we can identify them easily|
|FILE_CACHE_DIRECTORY||./cache||the name of the image cache directory. Left blank it will use the system temporary directory (which is better for security, but is not supported by all web hosts)|
|MAX_FILE_SIZE||10485760||10 Megs is 10485760. This is the max internal or external file size that we’ll process|
|CURL_TIMEOUT||20||Timeout duration for Curl. This only applies if you have Curl installed and aren’t using PHP’s default URL fetching mechanism.|
|WAIT_BETWEEN_FETCH_ERRORS||20||Time to wait between errors fetching remote file.|
|BROWSER_CACHE_MAX_AGE||864000||Browser cache duration (to prevent images from being reloaded more than once – the higher the number the better).|
|BROWSER_CACHE_DISABLE||true/ false||Use for testing if you want to disable browser caching.|
|MAX_WIDTH||1500||Put a sensible limit of the width of the resized image (so that crazy large images can’t be created)|
|MAX_HEIGHT||1500||Put a sensible limit of the height of the resized image (so that crazy large images can’t be created)|
|NOT_FOUND_IMAGE||null||Image to display if a 404 error occurs, instead of showing an error message|
|ERROR_IMAGE||null||Image to display if an error occurs, instead of showing an error message|
|PNG_IS_TRANSPARENT||null||Define if a png image should have a transparent background color. Use False value if you want to display a custom coloured canvas_colour|
The following settings alter the default values for the standard query string parameters.
|constant||values||What it does|
|DEFAULT_Q||90||Default image compression level (Q = quality)|
|DEFAULT_ZC||1||Default zoom crop value – more info about the zoom crop settings can be found here|
|DEFAULT_F||null||Default image filter – more info about the filter settings can be found here|
|DEFAULT_S||0||Default value for sharpening an image|
|DEFAULT_CC||ffffff||Default value for the canvas colour. This is used when editing the zc values in your image. More info here.|
Since it’s a PHP file the code should use the standard PHP format.
An example config would be something like:
<?php define('ALLOW_ALL_EXTERNAL_SITES', true); ?>