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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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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 |
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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 */ |