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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 |
|---|---|
| 3324 | /** |
| 3325 | * Filters the Smiley image URL before it's used in the image element. |
| 3326 | * |
| 3327 | * @since 2.9.0 |
| 3328 | * |
| 3329 | * @param string $smiley_url URL for the smiley image. |
| 3330 | * @param string $img Filename for the smiley image. |
| 3331 | * @param string $site_url Site URL, as returned by site_url(). |
| 3332 | */ |
| 3333 | $src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() ); |
| 3334 | |
| 3335 | return sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', esc_url( $src_url ), esc_attr( $smiley ) ); |
| 3336 | } |
| 3337 | |
| 3338 | /** |
| 3339 | * Convert text equivalent of smilies to images. |
| 3340 | * |
| 3341 | * Will only convert smilies if the option 'use_smilies' is true and the global |
| 3342 | * used in the function isn't empty. |