modify functions.php via child theme

Thanks, but how do I set up the child functions.php file? If I just copy the functions file to the child theme it breaks the site. Sorry, I can’t seem to find those instructions. Thanks!

Thanks @guenni007, that got me to the point where the functions.php file in my child theme isn’t breaking the site ;) So now I have the following in my child theme functions.php file. As you can see, I’ve changed the magazine line to use the same 495 x 400 used by the portfolio line. It doesn’t seem to be working — am I missing some code here, or do you have any other clues for me?

(@Nikko, thanks for the plugin suggestion, but I’d rather not just change all the 710 x 375 images generated by enfold to 495 x 400 — I’d rather just change what the magazine element uses and still have that 710 x 375 size available for other uses.)

<?php
$avia_config['imgSize']['widget'] 			 	= array('width'=>36,  'height'=>36);						// small preview pics eg sidebar news
$avia_config['imgSize']['square'] 		 	    = array('width'=>180, 'height'=>180);		                 // small image for blogs
$avia_config['imgSize']['featured'] 		 	= array('width'=>1500, 'height'=>430 );						// images for fullsize pages and fullsize slider
$avia_config['imgSize']['featured_large'] 		= array('width'=>1500, 'height'=>630 );						// images for fullsize pages and fullsize slider
$avia_config['imgSize']['extra_large'] 		 	= array('width'=>1500, 'height'=>1500 , 'crop' => false);	// images for fullscrren slider
$avia_config['imgSize']['portfolio'] 		 	= array('width'=>495, 'height'=>400 );						// images for portfolio entries (2,3 column)
$avia_config['imgSize']['portfolio_small'] 		= array('width'=>260, 'height'=>185 );						// images for portfolio 4 columns
$avia_config['imgSize']['gallery'] 		 		= array('width'=>845, 'height'=>684 );						// images for portfolio entries (2,3 column)
$avia_config['imgSize']['magazine'] 		 	= array('width'=>495, 'height'=>400 );						// images for magazines
$avia_config['imgSize']['masonry'] 		 		= array('width'=>705, 'height'=>705 , 'crop' => false);		// images for fullscreen masonry
$avia_config['imgSize']['entry_with_sidebar'] 	= array('width'=>845, 'height'=>321);		            	// big images for blog and page entries
$avia_config['imgSize']['entry_without_sidebar']= array('width'=>1210, 'height'=>423 );						// images for fullsize pages and fullsize slider
$avia_config['imgSize'] = apply_filters('avf_modify_thumb_size', $avia_config['imgSize']);

@Ismael — I did regenerate images and also tried re-uploading, just in case. The image I’m uploading is 720 x 465, so, as I understand it, it should crop to my new 495 x 400 size (since it’s bigger than that in both directions). But, BTW, should I even have to regenerate/re-upload since I’m just switching the Magazine size to use a thumbnail size already available in the theme?

@Guenni007 — Thanks, but I’m not trying to add a new size to the array, I’m just trying to tell the Magazine element to grab a different size — a size that’s already available in the theme. So I think it’s a little different solution than you’re referring to. But I could be wrong ;)

OK, @Guenni007 — putting the following in my child’s function.php file and re-uploading the images at a size greater than 495×400 worked! (note: regenerating the thumbnails with the Regenerate Thumbnails by József Koller plugin did not seem to work for me/this).

I’m curious, do you know what the 10, 1 refers to in the function?

Regardless, this solved my issue / answered my question — thanks so much!!

<?php

function custom_modified_thumb_sizes( $size ){
$size[‘magazine’] = array(‘width’=>495, ‘height’=>400 );
return $size;
}
add_filter(‘avf_modify_thumb_size’, ‘custom_modified_thumb_sizes’, 10, 1 );

Ahh, ok, thanks!