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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 |
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145 | * |
146 | * @since 3.6.0 |
147 | * |
148 | * @param bool $check_for_changes Whether to check for changes before saving a new revision. |
149 | * Default true. |
150 | * @param WP_Post $last_revision The last revision post object. |
151 | * @param WP_Post $post The post object. |
152 | * |
153 | */ |
154 | if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', $check_for_changes = true, $last_revision, $post ) ) { |
155 | $post_has_changed = false; |
156 |
|
157 | foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) { |
158 | if ( normalize_whitespace( $post->$field ) != normalize_whitespace( $last_revision->$field ) ) { |
159 | $post_has_changed = true; |
160 | break; |
161 | } |
162 | } |
163 |
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