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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 |
|---|---|
| 3178 | /** |
| 3179 | * Filters the Smiley image URL before it's used in the image element. |
| 3180 | * |
| 3181 | * @since 2.9.0 |
| 3182 | * |
| 3183 | * @param string $smiley_url URL for the smiley image. |
| 3184 | * @param string $img Filename for the smiley image. |
| 3185 | * @param string $site_url Site URL, as returned by site_url(). |
| 3186 | */ |
| 3187 | $src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() ); |
| 3188 | |
| 3189 | return sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', esc_url( $src_url ), esc_attr( $smiley ) ); |
| 3190 | } |
| 3191 | |
| 3192 | /** |
| 3193 | * Convert text equivalent of smilies to images. |
| 3194 | * |
| 3195 | * Will only convert smilies if the option 'use_smilies' is true and the global |
| 3196 | * used in the function isn't empty. |