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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 |
|---|---|
| 222 | * |
| 223 | * @type string|string[] $to Array or comma-separated list of email addresses to send message. |
| 224 | * @type string $subject Email subject. |
| 225 | * @type string $message Message contents. |
| 226 | * @type string|string[] $headers Additional headers. |
| 227 | * @type string|string[] $attachments Paths to files to attach. |
| 228 | * @type string|string[] $embeds Paths to files to embed. |
| 229 | * } |
| 230 | */ |
| 231 | $pre_wp_mail = apply_filters( 'pre_wp_mail', null, $atts ); |
| 232 | |
| 233 | if ( null !== $pre_wp_mail ) { |
| 234 | return $pre_wp_mail; |
| 235 | } |
| 236 | |
| 237 | if ( isset( $atts['to'] ) ) { |
| 238 | $to = $atts['to']; |
| 239 | } |
| 240 | |