Never do falsy checks on strings

Author: Zegnat

Mf2/Parser.php

@@ -1277,8 +1277,8 @@ public function parseRelsAndAlternates() {
 				$rel_attributes['type'] = $hyperlink->getAttribute('type');
 			}
 
-			if ($hyperlink->nodeValue) {
-				$rel_attributes['text'] = $hyperlink->nodeValue;
+			if (strlen($hyperlink->textContent) > 0) {
+				$rel_attributes['text'] = $hyperlink->textContent;
 			}
 
 			if ($this->enableAlternates) {

tests/Mf2/RelTest.php

@@ -209,4 +209,14 @@ public function testRelURLsNoDuplicates() {
     $this->assertEquals($output['rels']['a'], array('#a', '#b'));
   }
 
+  public function testRelURLsFalsyTextVSEmpty() {
+    $input = '<a href="#a" rel="a">0</a>
+<a href="#b" rel="b"></a>';
+    $parser = new Parser($input);
+    $output = $parser->parse();
+    $this->assertArrayHasKey('text', $output['rel-urls']['#a']);
+    $this->assertEquals($output['rel-urls']['#a']['text'], '0');
+    $this->assertArrayNotHasKey('text', $output['rel-urls']['#b']);
+  }
+
 }