wp-content/themes/twentytwentyone/inc/template-functions.php:363Prints the first instance of a block in the content, and then break away.
$block_namestring$contentstring|nulloptionalnull$instancesintoptional1boolOne hook fires while twenty_twenty_one_print_first_instance_of_block() runs, in this order:
function twenty_twenty_one_print_first_instance_of_block( $block_name, $content = null, $instances = 1 ) { $instances_count = 0; $blocks_content = ''; if ( ! $content ) { $content = get_the_content(); } // Parse blocks in the content. $blocks = parse_blocks( $content ); // Loop blocks. foreach ( $blocks as $block ) { // Confidence check. if ( ! isset( $block['blockName'] ) ) { continue; } // Check if this the block matches the $block_name. $is_matching_block = false; // If the block ends with *, try to match the first portion. if ( '*' === $block_name[-1] ) { $is_matching_block = 0 === strpos( $block['blockName'], rtrim( $block_name, '*' ) ); } else { $is_matching_block = $block_name === $block['blockName']; } if ( $is_matching_block ) { // Increment count. ++$instances_count; // Add the block HTML. $blocks_content .= render_block( $block ); // Break the loop if the $instances count was reached. if ( $instances_count >= $instances ) { break; } } } if ( $blocks_content ) { /** This filter is documented in wp-includes/post-template.php */ echo apply_filters( 'the_content', $blocks_content ); return true; } return false;}Introduced in Twenty Twenty-One 1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-content/themes/twentytwentyone/inc/template-functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.