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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
389 | break; |
390 | case 'image/gif': |
391 | $image = imagecreatefromgif($filepath); |
392 | break; |
393 | default: |
394 | $image = false; |
395 | break; |
396 | } |
397 | if ( is_resource($image) ) { |
398 | $image = apply_filters('load_image_to_edit', $image, $attachment_id, $size); |
399 | if ( function_exists('imagealphablending') && function_exists('imagesavealpha') ) { |
400 | imagealphablending($image, false); |
401 | imagesavealpha($image, true); |
402 | } |
403 | } |
404 | return $image; |
405 | } |
406 |
|
407 | /** |