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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 |
|---|---|
| 179 | * Filters the original content of the email. |
| 180 | * |
| 181 | * Give Post-By-Email extending plugins full access to the content, either |
| 182 | * the raw content, or the content of the last quoted-printable section. |
| 183 | * |
| 184 | * @since 2.8.0 |
| 185 | * |
| 186 | * @param string $content The original email content. |
| 187 | */ |
| 188 | $content = apply_filters( 'wp_mail_original_content', $content ); |
| 189 | |
| 190 | if ( false !== stripos( $content_transfer_encoding, 'quoted-printable' ) ) { |
| 191 | $content = quoted_printable_decode( $content ); |
| 192 | } |
| 193 | |
| 194 | if ( function_exists( 'iconv' ) && ! empty( $charset ) ) { |
| 195 | $content = iconv( $charset, get_option( 'blog_charset' ), $content ); |
| 196 | } |
| 197 | |