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