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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 |
|---|---|
| 1018 | * @see image_resize() |
| 1019 | * |
| 1020 | * @param mixed $file Filename of the original image, Or attachment id. |
| 1021 | * @param int $max_side Maximum length of a single side for the thumbnail. |
| 1022 | * @param mixed $deprecated Never used. |
| 1023 | * @return string Thumbnail path on success, Error string on failure. |
| 1024 | */ |
| 1025 | function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) { |
| 1026 | _deprecated_function( __FUNCTION__, '3.5', 'image_resize' ); |
| 1027 | return apply_filters( 'wp_create_thumbnail', image_resize( $file, $max_side, $max_side ) ); |
| 1028 | } |
| 1029 | |