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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 |
|---|---|
| 165 | * Filters the original content of the email. |
| 166 | * |
| 167 | * Give Post-By-Email extending plugins full access to the content, either |
| 168 | * the raw content, or the content of the last quoted-printable section. |
| 169 | * |
| 170 | * @since 2.8.0 |
| 171 | * |
| 172 | * @param string $content The original email content. |
| 173 | */ |
| 174 | $content = apply_filters( 'wp_mail_original_content', $content ); |
| 175 | |
| 176 | if ( false !== stripos($content_transfer_encoding, "quoted-printable") ) { |
| 177 | $content = quoted_printable_decode($content); |
| 178 | } |
| 179 | |
| 180 | if ( function_exists('iconv') && ! empty( $charset ) ) { |
| 181 | $content = iconv($charset, get_option('blog_charset'), $content); |
| 182 | } |
| 183 | |