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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 |
---|---|
73 | case 'option' : |
74 | if ( empty( $this->id_data[ 'keys' ] ) ) |
75 | add_filter( 'pre_option_' . $this->id_data[ 'base' ], array( $this, '_preview_filter' ) ); |
76 | else { |
77 | add_filter( 'option_' . $this->id_data[ 'base' ], array( $this, '_preview_filter' ) ); |
78 | add_filter( 'default_option_' . $this->id_data[ 'base' ], array( $this, '_preview_filter' ) ); |
79 | } |
80 | break; |
81 | default : |
82 | do_action( 'customize_preview_' . $this->id ); |
83 | } |
84 | } |
85 |
|
86 | /** |
87 | * Callback function to filter the theme mods and options. |
88 | * |
89 | * @since 3.4.0 |
90 | * |
91 | * @param mixed Old value. |