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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 | 
|---|---|
| 116 |      ); | 
| 117 |  | 
| 118 |      /** | 
| 119 |       * Filter number of front page sections in Twenty Seventeen. | 
| 120 |       * | 
| 121 |       * @since Twenty Seventeen 1.0 | 
| 122 |       * | 
| 123 |       * @param int $num_sections Number of front page sections. | 
| 124 |       */ | 
| 125 |      $num_sections = apply_filters( 'twentyseventeen_front_page_sections', 4 ); | 
| 126 |  | 
| 127 |      // Create a setting and control for each of the sections available in the theme. | 
| 128 |      for ( $i = 1; $i < ( 1 + $num_sections ); $i++ ) { | 
| 129 |           $wp_customize->add_setting( | 
| 130 |                'panel_' . $i, | 
| 131 |                array( | 
| 132 |                     'default'           => false, | 
| 133 |                     'sanitize_callback' => 'absint', | 
| 134 |                     'transport'         => 'postMessage', |