Ported all markdown.js to PHP, untested

js/markdown.js

@@ -2706,8 +2706,8 @@ class MDSimplePairInlineReader extends MDReader {
 		// We do four passes. #1: doubles without inner tokens, #2: singles
 		// without inner tokens, #3: doubles with paired inner tokens,
 		// #4: singles with paired inner tokens
-		if (count == 1 && pass != 2 && pass != 4) return;
-		if (count > 1 && pass != 1 && pass != 3) return;
+		if (count == 1 && pass != 2 && pass != 4) return false;
+		if (count > 1 && pass != 1 && pass != 3) return false;
 		let delimiters = Array(count).fill(delimiter);
 		const isFirstOfMultiplePasses = this.substitutionPassCount > 1 && pass == 1;
 		let match = MDToken.findPairedTokens(tokens, delimiters, delimiters, function(content) {
@@ -3129,8 +3129,8 @@ class MDHTMLTagReader extends MDReader {
 	substituteTokens(state, pass, tokens) {
 		var match;
 		if (match = MDToken.findFirstTokens(tokens, [ MDTokenType.HTMLTag ])) {
-			const tag = match.tokens[0].tag
-			tokens.splice(match.index, match.tokens.length, new MDHTMLTagNode(tag))
+			const tag = match.tokens[0].tag;
+			tokens.splice(match.index, match.tokens.length, new MDHTMLTagNode(tag));
 			return true;
 		}
 		return false;