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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 |
|---|---|
| 175 | |
| 176 | /** |
| 177 | * Filters the wp_mail() arguments. |
| 178 | * |
| 179 | * @since 2.2.0 |
| 180 | * |
| 181 | * @param array $args A compacted array of wp_mail() arguments, including the "to" email, |
| 182 | * subject, message, headers, and attachments values. |
| 183 | */ |
| 184 | $atts = apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ); |
| 185 | |
| 186 | if ( isset( $atts['to'] ) ) { |
| 187 | $to = $atts['to']; |
| 188 | } |
| 189 | |
| 190 | if ( isset( $atts['subject'] ) ) { |
| 191 | $subject = $atts['subject']; |
| 192 | } |
| 193 | |