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Wilto/functions.php

Last active August 29, 2015 14:27
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functions.php
// https://www.youtube.com/watch?v=b9N3tIlEJNc
function normalize_headings( $content ) {
// Move all headings below H2 down one notch
$output = preg_replace( "/<(.*)h4(.*)>(.*)(<\/h2>)/", "<$1h5$2>$3</h5>", $content );
$output = preg_replace( "/<(.*)h3(.*)>(.*)(<\/h2>)/", "<$1h4$2>$3</h4>", $output );
// H1 and H2 both collapse to H3
$output = preg_replace( "/<(.*)h1(.*)>(.*)(<\/h1>)/", "<$1h3$2>$3</h3>", $output );
$output = preg_replace( "/<(.*)h2(.*)>(.*)(<\/h2>)/", "<$1h3$2>$3</h3>", $output );
print apply_filters( 'normalize_headings', $output );
}
add_filter('the_content', 'normalize_headings' );
@kadamwhite
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<?php

// https://www.youtube.com/watch?v=b9N3tIlEJNc

function bocoup_normalize_headings( $content ) {
  // Move all headings below H2 down one notch
  $output = str_replace( '<h4', '<h5', $content );
  $output = str_replace( '<h4', '<h5', $output );
  $output = str_replace( '<h3', '<h4', $output );
  // H1 and H2 both collapse to H3
  $output = str_replace( '<h1', '<h3', $output );
  $output = str_replace( '<h2', '<h3', $output );
  print apply_filters( 'normalize_headings', $output );
}

add_filter( 'the_content', 'normalize_headings' );

@kadamwhite
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And don't forget we're really looking at (<\/?)h3([^>]*>), e.g., since we need to match closing tags and possible classes etc (if somebody hard-coded one) too

@kadamwhite
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cc Zalgo

@kadamwhite
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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title></title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<?php

$content = '<h1>I am an H1</h1>' .
  '<h2 class="i">I am an H2</h2>' .
  '<h3 class="am">I am an H3</h3>' .
  '<h3>I am another H3</h3>' .
  '<h4 data-class="not">I am an H4</h4>' .
  '<h5 id="scurred">I <em>am</em> an H5</h5>' .
  '<h6>I am an H6</h6>';



echo $content;

?>
<img src="http://33.media.tumblr.com/tumblr_m9ye8nDI0p1qmg4ti.gif"/>
</body>
</html>

@kadamwhite
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<?php
function switch_heading( $content, $fromHeading, $toHeading ) {
  // First capture group: from start of tag `<` through to the $fromHeading (e.g. "h2")
  // Second capture group: from after $fromHeading through to the end of tag `>`
  // Third capture group (.*? means "not greedy") is everything through to the closing tag
  $fromRegExp = '/<([^>]*)' . $fromHeading . '([^>]*)>(.*?<\/)' . $fromHeading . '>/';
  $toReplacement = '<$1' . $toHeading . '$2>$3' . $toHeading . '>';
  // https://www.youtube.com/watch?v=b9N3tIlEJNc
  // http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags/1732454#1732454
  return preg_replace( $fromRegExp, $toReplacement, $content );
}

function normalize_headings( $content ) {
  // Move all headings below H2 down one notch
  $output = switch_heading( $content, 'h5', 'h6' );
  $output = switch_heading( $output, 'h4', 'h5' );
  $output = switch_heading( $output, 'h3', 'h4' );
  // H1 and H2 both collapse to H3
  $output = switch_heading( $output, 'h2', 'h3' );
  $output = switch_heading( $output, 'h1', 'h3' );

  return $output;
}

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