wpautop() WordPress Function

function wpautop( $text, $br = true ) {
	$pre_tags = array();

	if ( trim( $text ) === '' ) {
		return '';
	}

	// Just to make things a little easier, pad the end.
	$text = $text . "\n";

	/*
	 * Pre tags shouldn't be touched by autop.
	 * Replace pre tags with placeholders and bring them back after autop.
	 */
	if ( strpos( $text, '<pre' ) !== false ) {
		$text_parts = explode( '</pre>', $text );
		$last_part  = array_pop( $text_parts );
		$text       = '';
		$i          = 0;

		foreach ( $text_parts as $text_part ) {
			$start = strpos( $text_part, '<pre' );

			// Malformed HTML?
			if ( false === $start ) {
				$text .= $text_part;
				continue;
			}

			$name              = "<pre wp-pre-tag-$i></pre>";
			$pre_tags[ $name ] = substr( $text_part, $start ) . '</pre>';

			$text .= substr( $text_part, 0, $start ) . $name;
			$i++;
		}

		$text .= $last_part;
	}
	// Change multiple <br>'s into two line breaks, which will turn into paragraphs.
	$text = preg_replace( '|<br\s*/?>\s*<br\s*/?>|', "\n\n", $text );

	$allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|form|map|area|blockquote|address|math|style|p|h[1-6]|hr|fieldset|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';

	// Add a double line break above block-level opening tags.
	$text = preg_replace( '!(<' . $allblocks . '[\s/>])!', "\n\n$1", $text );

	// Add a double line break below block-level closing tags.
	$text = preg_replace( '!(</' . $allblocks . '>)!', "$1\n\n", $text );

	// Add a double line break after hr tags, which are self closing.
	$text = preg_replace( '!(<hr\s*?/?>)!', "$1\n\n", $text );

	// Standardize newline characters to "\n".
	$text = str_replace( array( "\r\n", "\r" ), "\n", $text );

	// Find newlines in all elements and add placeholders.
	$text = wp_replace_in_html_tags( $text, array( "\n" => ' <!-- wpnl --> ' ) );

	// Collapse line breaks before and after <option> elements so they don't get autop'd.
	if ( strpos( $text, '<option' ) !== false ) {
		$text = preg_replace( '|\s*<option|', '<option', $text );
		$text = preg_replace( '|</option>\s*|', '</option>', $text );
	}

	/*
	 * Collapse line breaks inside <object> elements, before <param> and <embed> elements
	 * so they don't get autop'd.
	 */
	if ( strpos( $text, '</object>' ) !== false ) {
		$text = preg_replace( '|(<object[^>]*>)\s*|', '$1', $text );
		$text = preg_replace( '|\s*</object>|', '</object>', $text );
		$text = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $text );
	}

	/*
	 * Collapse line breaks inside <audio> and <video> elements,
	 * before and after <source> and <track> elements.
	 */
	if ( strpos( $text, '<source' ) !== false || strpos( $text, '<track' ) !== false ) {
		$text = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $text );
		$text = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $text );
		$text = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $text );
	}

	// Collapse line breaks before and after <figcaption> elements.
	if ( strpos( $text, '<figcaption' ) !== false ) {
		$text = preg_replace( '|\s*(<figcaption[^>]*>)|', '$1', $text );
		$text = preg_replace( '|</figcaption>\s*|', '</figcaption>', $text );
	}

	// Remove more than two contiguous line breaks.
	$text = preg_replace( "/\n\n+/", "\n\n", $text );

	// Split up the contents into an array of strings, separated by double line breaks.
	$paragraphs = preg_split( '/\n\s*\n/', $text, -1, PREG_SPLIT_NO_EMPTY );

	// Reset $text prior to rebuilding.
	$text = '';

	// Rebuild the content as a string, wrapping every bit with a <p>.
	foreach ( $paragraphs as $paragraph ) {
		$text .= '<p>' . trim( $paragraph, "\n" ) . "</p>\n";
	}

	// Under certain strange conditions it could create a P of entirely whitespace.
	$text = preg_replace( '|<p>\s*</p>|', '', $text );

	// Add a closing <p> inside <div>, <address>, or <form> tag if missing.
	$text = preg_replace( '!<p>([^<]+)</(div|address|form)>!', '<p>$1</p></$2>', $text );

	// If an opening or closing block element tag is wrapped in a <p>, unwrap it.
	$text = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $text );

	// In some cases <li> may get wrapped in <p>, fix them.
	$text = preg_replace( '|<p>(<li.+?)</p>|', '$1', $text );

	// If a <blockquote> is wrapped with a <p>, move it inside the <blockquote>.
	$text = preg_replace( '|<p><blockquote([^>]*)>|i', '<blockquote$1><p>', $text );
	$text = str_replace( '</blockquote></p>', '</p></blockquote>', $text );

	// If an opening or closing block element tag is preceded by an opening <p> tag, remove it.
	$text = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)!', '$1', $text );

	// If an opening or closing block element tag is followed by a closing <p> tag, remove it.
	$text = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $text );

	// Optionally insert line breaks.
	if ( $br ) {
		// Replace newlines that shouldn't be touched with a placeholder.
		$text = preg_replace_callback( '/<(script|style|svg).*?<\/\\1>/s', '_autop_newline_preservation_helper', $text );

		// Normalize <br>
		$text = str_replace( array( '<br>', '<br/>' ), '<br />', $text );

		// Replace any new line characters that aren't preceded by a <br /> with a <br />.
		$text = preg_replace( '|(?<!<br />)\s*\n|', "<br />\n", $text );

		// Replace newline placeholders with newlines.
		$text = str_replace( '<WPPreserveNewline />', "\n", $text );
	}

	// If a <br /> tag is after an opening or closing block tag, remove it.
	$text = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*<br />!', '$1', $text );

	// If a <br /> tag is before a subset of opening or closing block tags, remove it.
	$text = preg_replace( '!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $text );
	$text = preg_replace( "|\n</p>$|", '</p>', $text );

	// Replace placeholder <pre> tags with their original content.
	if ( ! empty( $pre_tags ) ) {
		$text = str_replace( array_keys( $pre_tags ), array_values( $pre_tags ), $text );
	}

	// Restore newlines in all elements.
	if ( false !== strpos( $text, '<!-- wpnl -->' ) ) {
		$text = str_replace( array( ' <!-- wpnl --> ', '<!-- wpnl -->' ), "\n", $text );
	}

	return $text;
}