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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 |
|---|---|
| 792 | |
| 793 | /** |
| 794 | * Filters the list of intermediate image sizes. |
| 795 | * |
| 796 | * @since 2.5.0 |
| 797 | * |
| 798 | * @param array $image_sizes An array of intermediate image sizes. Defaults |
| 799 | * are 'thumbnail', 'medium', 'medium_large', 'large'. |
| 800 | */ |
| 801 | return apply_filters( 'intermediate_image_sizes', $image_sizes ); |
| 802 | } |
| 803 | |
| 804 | /** |
| 805 | * Retrieve an image to represent an attachment. |
| 806 | * |
| 807 | * A mime icon for files, thumbnail or intermediate size for images. |
| 808 | * |
| 809 | * The returned array contains four values: the URL of the attachment image src, |
| 810 | * the width of the image file, the height of the image file, and a boolean |