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