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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 |
|---|---|
| 484 | * @since 3.0.0 |
| 485 | * @return array Returns a filtered array of image size strings |
| 486 | */ |
| 487 | function get_intermediate_image_sizes() { |
| 488 | global $_wp_additional_image_sizes; |
| 489 | $image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes |
| 490 | if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) ) |
| 491 | $image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) ); |
| 492 | |
| 493 | return apply_filters( 'intermediate_image_sizes', $image_sizes ); |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * Retrieve an image to represent an attachment. |
| 498 | * |
| 499 | * A mime icon for files, thumbnail or intermediate size for images. |
| 500 | * |
| 501 | * @since 2.5.0 |
| 502 | * |