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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.
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61 | } |
62 |
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63 | /** |
64 | * Filter the thumbnail image size for use in the embed template. |
65 | * |
66 | * @since 4.4.0 |
67 | * |
68 | * @param string $image_size Thumbnail image size. |
69 | */ |
70 | $image_size = apply_filters( 'embed_thumbnail_image_size', $image_size ); |
71 |
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72 | $shape = $measurements[0] / $measurements[1] >= 1.75 ? 'rectangular' : 'square'; |
73 |
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74 | /** |
75 | * Filter the thumbnail shape for use in the embed template. |
76 | * |
77 | * Rectangular images are shown above the title |
78 | * while square images are shown next to the content. |
79 | * |