` tags with parameter. * * @since 2.0.8 * * @param string $string * @param string $to * * @return string */ function br2( $string, $to = "\r\n" ) { $string = preg_replace( '``i', $to, $string ); return $string; } /** * Replace `
` tags with new lines. * * @link https://stackoverflow.com/a/27509016/5351316 * * @since 2.0.8 * * @param string $string * * @return string */ function br2nl( $string ) { return br2( $string ); } /** * Pulled from WordPress formatting functions. * * Edited to add space before self closing tags. * * @since 2.0 * * @param string $text * * @return string|string[] */ function force_balance_tags( $text ) { $tagstack = array(); $stacksize = 0; $tagqueue = ''; $newtext = ''; // Known single-entity/self-closing tags $single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' ); // Tags that can be immediately nested within themselves $nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' ); // WP bug fix for comments - in case you REALLY meant to type '< !--' $text = str_replace( '< !--', '< !--', $text ); // WP bug fix for LOVE <3 (and other situations with '<' before a number) $text = preg_replace( '#<([0-9]{1})#', '<$1', $text ); /** * Matches supported tags. * * To get the pattern as a string without the comments paste into a PHP * REPL like `php -a`. * * @see https://html.spec.whatwg.org/#elements-2 * @see https://w3c.github.io/webcomponents/spec/custom/#valid-custom-element-name * * @example * ~# php -a * php > $s = [paste copied contents of expression below including parentheses]; * php > echo $s; */ $tag_pattern = ( '#<' . // Start with an opening bracket. '(/?)' . // Group 1 - If it's a closing tag it'll have a leading slash. '(' . // Group 2 - Tag name. // Custom element tags have more lenient rules than HTML tag names. '(?:[a-z](?:[a-z0-9._]*)-(?:[a-z0-9._-]+)+)' . '|' . // Traditional tag rules approximate HTML tag names. '(?:[\w:]+)' . ')' . '(?:' . // We either immediately close the tag with its '>' and have nothing here. '\s*' . '(/?)' . // Group 3 - "attributes" for empty tag. '|' . // Or we must start with space characters to separate the tag name from the attributes (or whitespace). '(\s+)' . // Group 4 - Pre-attribute whitespace. '([^>]*)' . // Group 5 - Attributes. ')' . '>#' // End with a closing bracket. ); while ( preg_match( $tag_pattern, $text, $regex ) ) { $full_match = $regex[0]; $has_leading_slash = ! empty( $regex[1] ); $tag_name = $regex[2]; $tag = strtolower( $tag_name ); $is_single_tag = in_array( $tag, $single_tags, true ); $pre_attribute_ws = isset( $regex[4] ) ? $regex[4] : ''; $attributes = trim( isset( $regex[5] ) ? $regex[5] : $regex[3] ); $has_self_closer = '/' === substr( $attributes, -1 ); $newtext .= $tagqueue; $i = strpos( $text, $full_match ); $l = strlen( $full_match ); // Clear the shifter. $tagqueue = ''; if ( $has_leading_slash ) { // End Tag. // If too many closing tags. if ( $stacksize <= 0 ) { $tag = ''; // Or close to be safe $tag = '/' . $tag. // If stacktop value = tag close value, then pop. } elseif ( $tagstack[ $stacksize - 1 ] === $tag ) { // Found closing tag. $tag = ''; // Close Tag. array_pop( $tagstack ); $stacksize--; } else { // Closing tag not at top, search for it. for ( $j = $stacksize - 1; $j >= 0; $j-- ) { if ( $tagstack[ $j ] === $tag ) { // Add tag to tagqueue. for ( $k = $stacksize - 1; $k >= $j; $k-- ) { $tagqueue .= ''; $stacksize--; } break; } } $tag = ''; } } else { // Begin Tag. if ( $has_self_closer ) { // If it presents itself as a self-closing tag... // ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such and // immediately close it with a closing tag (the tag will encapsulate no text as a result) if ( ! $is_single_tag ) { $attributes = trim( substr( $attributes, 0, -1 ) ) . "> 0 && ! in_array( $tag, $nestable_tags, true ) && $tagstack[ $stacksize - 1 ] === $tag ) { $tagqueue = ''; $stacksize--; } $stacksize = array_push( $tagstack, $tag ); } // Attributes. if ( $has_self_closer && $is_single_tag ) { // We need some space - avoid
and prefer
. $pre_attribute_ws = ' '; } $tag = '<' . $tag . $pre_attribute_ws . $attributes . '>'; // If already queuing a close tag, then put this tag on too. if ( ! empty( $tagqueue ) ) { $tagqueue .= $tag; $tag = ''; } } $newtext .= substr( $text, 0, $i ) . $tag; $text = substr( $text, $i + $l ); } // Clear Tag Queue. $newtext .= $tagqueue; // Add remaining text. $newtext .= $text; while ( $x = array_pop( $tagstack ) ) { $newtext .= ''; // Add remaining tags to close. } // WP fix for the bug with HTML comments. $newtext = str_replace( '< !--', '