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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 |
|---|---|
| 577 | * @since 3.0.0 |
| 578 | * @return array Returns a filtered array of image size strings |
| 579 | */ |
| 580 | function get_intermediate_image_sizes() { |
| 581 | global $_wp_additional_image_sizes; |
| 582 | $image_sizes = array('thumbnail', 'medium', 'large'); // Standard sizes |
| 583 | if ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) ) |
| 584 | $image_sizes = array_merge( $image_sizes, array_keys( $_wp_additional_image_sizes ) ); |
| 585 | |
| 586 | return apply_filters( 'intermediate_image_sizes', $image_sizes ); |
| 587 | } |
| 588 | |
| 589 | /** |
| 590 | * Retrieve an image to represent an attachment. |
| 591 | * |
| 592 | * A mime icon for files, thumbnail or intermediate size for images. |
| 593 | * |
| 594 | * @since 2.5.0 |
| 595 | * |