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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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309 | * shortcode generation process, returning that value instead. |
310 | * |
311 | * @since 4.7.0 |
312 | * |
313 | * @param bool|string $return Short-circuit return value. Either false or the value to replace the shortcode with. |
314 | * @param string $tag Shortcode name. |
315 | * @param array|string $attr Shortcode attributes array or empty string. |
316 | * @param array $m Regular expression match array. |
317 | */ |
318 | $return = apply_filters( 'pre_do_shortcode_tag', false, $tag, $attr, $m ); |
319 | if ( false !== $return ) { |
320 | return $return; |
321 | } |
322 |
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323 | $content = isset( $m[5] ) ? $m[5] : null; |
324 |
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325 | $output = $m[1] . call_user_func( $shortcode_tags[ $tag ], $attr, $content, $tag ) . $m[6]; |
326 |
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327 | /** |