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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 |
|---|---|
| 191 | * Array of the `wp_mail()` arguments. |
| 192 | * |
| 193 | * @type string|string[] $to Array or comma-separated list of email addresses to send message. |
| 194 | * @type string $subject Email subject. |
| 195 | * @type string $message Message contents. |
| 196 | * @type string|string[] $headers Additional headers. |
| 197 | * @type string|string[] $attachments Paths to files to attach. |
| 198 | * } |
| 199 | */ |
| 200 | $atts = apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ); |
| 201 | |
| 202 | /** |
| 203 | * Filters whether to preempt sending an email. |
| 204 | * |
| 205 | * Returning a non-null value will short-circuit {@see wp_mail()}, returning |
| 206 | * that value instead. A boolean return value should be used to indicate whether |
| 207 | * the email was successfully sent. |
| 208 | * |
| 209 | * @since 5.7.0 |