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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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139 | * This filter allows for additional checks to determine if there were changes. |
140 | * |
141 | * @since 4.1.0 |
142 | * |
143 | * @param bool $post_has_changed Whether the post has changed. |
144 | * @param WP_Post $last_revision The last revision post object. |
145 | * @param WP_Post $post The post object. |
146 | * |
147 | */ |
148 | $post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $last_revision, $post ); |
149 |
|
150 | //don't save revision if post unchanged |
151 | if( ! $post_has_changed ) { |
152 | return; |
153 | } |
154 | } |
155 | } |
156 |
|
157 | $return = _wp_put_post_revision( $post ); |