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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 |
|---|---|
| 142 | * Filters the allowed block types for the editor, defaulting to true (all |
| 143 | * block types supported). |
| 144 | * |
| 145 | * @since 5.0.0 |
| 146 | * |
| 147 | * @param bool|array $allowed_block_types Array of block type slugs, or |
| 148 | * boolean to enable/disable all. |
| 149 | * @param object $post The post resource data. |
| 150 | */ |
| 151 | $allowed_block_types = apply_filters( 'allowed_block_types', true, $post ); |
| 152 | |
| 153 | // Get all available templates for the post/page attributes meta-box. |
| 154 | // The "Default template" array element should only be added if the array is |
| 155 | // not empty so we do not trigger the template select element without any options |
| 156 | // besides the default value. |
| 157 | $available_templates = wp_get_theme()->get_page_templates( get_post( $post->ID ) ); |
| 158 | $available_templates = ! empty( $available_templates ) ? array_merge( |
| 159 | array( |
| 160 | /** This filter is documented in wp-admin/includes/meta-boxes.php */ |