回答編集履歴
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質問が変更されたので
test
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@@ -1,25 +1,67 @@
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DOMでやってもいいですが、このくらいならpタグを抜いちゃってから
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たとえばこんな感じでしょうか?
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```ここに言語を入力
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<?PHP
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$xml=<<<eod
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aaaaaaaaaaaaaaaaaaaaaaaa
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<p>
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bbbbbbbbbbbbbbbbbbbbbbbb
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<!--ccccccccccccccccc-->
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dddddddddddddddddddddddd
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</p>
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<p>
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<!--eeeeeeeeeeeeeeeee-->
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ffffffffffffffffffffffff
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</p>
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<p>
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ggggggggggggggggggggggg
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<!--hhhhhhhhhhhhhhhh-->
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</p>
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iiiiiiiiiiiiiiiiiiiiiii
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eod;
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$pattern="/(<p>[\r\n]{1,2})(.*?)(<!--.*?-->[\r\n]{1,2})(.*?)(<\/p>(?:[\r\n]{1,2}|$))/mis";
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if(preg_match_all($pattern,$xml,$matches,PREG_SET_ORDER)){
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foreach($matches as $match){
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if($match[2]===""){
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$xml=str_replace($match[0],$match[3].$match[1].$match[4].$match[5],$xml);
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}elseif($match[4]===""){
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$xml=str_replace($match[0],$match[1].$match[2].$match[5].$match[3],$xml);
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}else{
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$xml=str_replace($match[0],$match[1].$match[2].$match[5].$match[3].$match[1].$match[4].$match[5],$xml);
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}
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}
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};
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66
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```
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