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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 |
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196 | * @param string|array $to Array or comma-separated list of email addresses to send message. |
197 | * @param string $subject Email subject |
198 | * @param string $message Message contents |
199 | * @param string|array $headers Optional. Additional headers. |
200 | * @param string|array $attachments Optional. Files to attach. |
201 | * @return bool Whether the email contents were sent successfully. |
202 | */ |
203 | function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) { |
204 | // Compact the input, apply the filters, and extract them back out |
205 | extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) ) ); |
206 |
|
207 | if ( !is_array($attachments) ) |
208 | $attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) ); |
209 |
|
210 | global $phpmailer; |
211 |
|
212 | // (Re)create it, if it's gone missing |
213 | if ( !is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' ) ) { |
214 | require_once ABSPATH . WPINC . '/class-phpmailer.php'; |