Online PHP editor | refs for IvgBT

<?php $offsets = [ 1 => [0,2], 2 => [2,5], 3 => [8,9] ]; $html = <<<HTML <div>This is</div> only a test for stackoverflow HTML; $ignoreTag = false; $insertTagStart = false; $char = 0; for ($i = 0; $i < strlen($html); ++$i) { if ($ignoreTag && $html[$i] == '>') { $ignoreTag = false; } elseif ($html[$i] == '<') { if ($insertTagStart !== false) { // insert tag interruption, print closing tag, modify the lookup ++$offsets[$insertTagStart][0]; $html = substr_replace($html, "</span>", $i, 0); $i += 6; // </span> = 7 minus 1 before loop's increment } $ignoreTag = true; } else { foreach ($offsets as $id => $set) { if ($char == $set[0]) { $insertTagStart = $id; $insertTag = "<span class='annotation n-{$id}'>"; $i += strlen($insertTag) - 1; // compensate for inserted substring while traversing html $html = substr_replace($html, $insertTag, $char, 0); } elseif ($insertTagStart == $id && $set[1] == $char) { $html = substr_replace($html, "</span>", $char, 0); $insertTagStart = false; } } ++$char; } echo "{$char},\t" , ($ignoreTag ? 't' : 'f') , ",\t" , ($insertTagStart === false ? 'f' : $insertTagStart) , ",\t" , $html , "\n"; } echo $html;