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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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334 | * and styles which may get enqueued in the response. |
335 | * |
336 | * @since 4.5.0 |
337 | * |
338 | * @param WP_Customize_Selective_Refresh $refresh Selective refresh component. |
339 | * @param array $partials Placements' context data for the partials rendered in the request. |
340 | * The array is keyed by partial ID, with each item being an array of |
341 | * the placements' context data. |
342 | */ |
343 | do_action( 'customize_render_partials_before', $this, $partials ); |
344 |
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345 | set_error_handler( array( $this, 'handle_error' ), error_reporting() ); |
346 |
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347 | $contents = array(); |
348 |
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349 | foreach ( $partials as $partial_id => $container_contexts ) { |
350 | $this->current_partial_id = $partial_id; |
351 |
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352 | if ( ! is_array( $container_contexts ) ) { |