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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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282 |
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283 | /** |
284 | * Filters the list of file types allowed for editing in the theme editor. |
285 | * |
286 | * @since 4.4.0 |
287 | * |
288 | * @param string[] $default_types An array of editable theme file extensions. |
289 | * @param WP_Theme $theme The current theme object. |
290 | */ |
291 | $file_types = apply_filters( 'wp_theme_editor_filetypes', $default_types, $theme ); |
292 |
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293 | // Ensure that default types are still there. |
294 | return array_unique( array_merge( $file_types, $default_types ) ); |
295 | } |
296 |
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297 | /** |
298 | * Prints file editor templates (for plugins and themes). |
299 | * |
300 | * @since 4.9.0 |