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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 |
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15 | * |
16 | * @since 1.2.0 |
17 | * |
18 | * @param mixed $file Filename of the original image, Or attachment id. |
19 | * @param int $max_side Maximum length of a single side for the thumbnail. |
20 | * @return string Thumbnail path on success, Error string on failure. |
21 | */ |
22 | function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) { |
23 | $thumbpath = image_resize( $file, $max_side, $max_side ); |
24 | return apply_filters( 'wp_create_thumbnail', $thumbpath ); |
25 | } |
26 |
|
27 | /** |
28 | * Crop an Image to a given size. |
29 | * |
30 | * @since 2.1.0 |
31 | * |
32 | * @param string|int $src_file The source file or Attachment ID. |
33 | * @param int $src_x The start x position to crop from. |