Add version number to images in symfony to avoid browser caching
I would like to avoid browser caching on my images by adding the SVN version number after each image like this (in the same way as this announcement ):
<?php $v = getRevisionNumber() ?>
<img src="picture.jpg?v=<?= $v ?>" alt="">
Is there a way to do this automatically in Symfony 1.4 ( like it is for js / css, but instead of images)
Also, how can I do this for an image that is in a css file?
#title {
background-image: url(/images/title.png);
}
source to share
I found something interesting in symfony tracker, for version 1.3 / 1.4, there was a patch that automatically adds a timestamp to all files in the web directory: http://trac.symfony-project.org/ticket/6135
It has been canceled since then, don't know why ... (intrusive?).
Override the default helper
Anyway, I think you need to create your own AssetHelper (copied all content from the current one) and add and configure patch # 6135 in lib/helper/CustomAssetHelper.php
.
But you cannot unload the AssetHelper because it is automatically loaded into the kernel: http://trac.symfony-project.org/browser/branches/1.4/lib/view/sfPHPView.class.php#L33 So there will be a conflict, since you have double function (in AssetHelper and CustomAssetHelper).
Add custom template engine
The idea is for a custom sfPHPView
override loadCoreAndStandardHelpers
to call your own resource helper (put it in lib/view/sfCustomPHPView.class.php
):
class sfCustomPHPView extends sfPHPView
{
/**
* Loads core and standard helpers to be use in the template.
*/
protected function loadCoreAndStandardHelpers()
{
static $coreHelpersLoaded = 0;
if ($coreHelpersLoaded)
{
return;
}
$coreHelpersLoaded = 1;
$helpers = array_unique(array_merge(array('Helper', 'Url', 'CustomAsset', 'Tag', 'Escaping'), sfConfig::get('sf_standard_helpers')));
// remove default Form helper if compat_10 is false
if (!sfConfig::get('sf_compat_10') && false !== $i = array_search('Form', $helpers))
{
unset($helpers[$i]);
}
$this->context->getConfiguration()->loadHelpers($helpers);
}
}
To change the default sfPHPView file, you need to add module.yml
in config/
or apps/frontend/config/
with the following content ( inspired by sfTwigPlugin ):
all:
view_class: sfCustom
Cancel all image_tag()
As Izmir Ramirez said, image_tag()
calling image_path()
, calling _compute_public_path($source, 'images', 'png', $absolute);
.
In the function _compute_public_path
before the last condition, you set up the query_string to add your own version number (which will define somewhere else - like sfConfig):
$file = sfConfig::get('sf_web_dir').$source;
if ('images' == $dir && sfConfig::get('my_revision_number'))
{
$query_string .= sfConfig::get('my_revision_number');
}
It can be a little tricky, but using this method, you can override the image_tag function and add the desired version number without overriding the entire image_tag () call.
About the image inside the CSS, this is a bit tricky as you will have to parse the css or write the css in PHP. Not sure how best to do it.
source to share