SWELLカスタマイズ｜ステップブロックのステップを見出しタグ（h3/h4）に変更する

<?php
add_filter( 'render_block_loos/step', function($block_content, $block){
	
	if(array_key_exists('className', $block['attrs'])){
		$str = $block['attrs']['className'];
	}else{
		$str = "";
	}
	$check_h4 = "h__4"; 
	$check_h3 = "h__3"; 
	if ( strpos( $str, $check_h4 ) !== false ) {  $htag="h4";}
	if ( strpos( $str, $check_h3 ) !== false ) {  $htag="h3";}
	if(empty($htag)){return $block_content;}
	
	// stepタイトルを取得 PREG_SET_ORDER
	$has_step = preg_match_all( '|<div class="swell-block-step__title.*?>.*?<\/div>|im', $block_content, $step_list, PREG_SET_ORDER );

	//  stepタイトルがなければ何もしない
	if ( ! $has_step ) return $block_content;

	//  各stepタイトルのdivを置き換える
	foreach ( $step_list as $num => $step ) {
		$step_list_h[$num] = str_replace('<div class="swell-block-step__title', '<'.$htag.' class="swell-block-step__title', $step_list[$num]);
		$step_list_h[$num] = str_replace('</div>', '</'.$htag.'>', $step_list_h[$num]);
		$block_content = str_replace($step_list[$num],$step_list_h[$num], $block_content);
	}
  return $block_content;
}, 20, 2 );

.swell-block-step__item h3,
.swell-block-step__item h4 {
    padding: 0;
    margin: 0;
    font-size: 1em;
	border:none;
}
@media (min-width: 600px) {
.swell-block-step__item h3,
.swell-block-step__item h4{
        font-size: 1em;
    }
}
.swell-block-step__item h3::before,
.swell-block-step__item h4::before {
    background: none;
}