Creating function for PHP wrapper and freeing pointer

wrappers/wrapper.php

@@ -1,9 +1,19 @@
 <?php
 
-$ffi = FFI::cdef(
-    'char *cmark_markdown_to_html(const char *text, size_t len, int options);',
-    'libcmark.so'
-);
+function markdownToHtml(string $markdown): string
+{
+    $ffi = FFI::cdef(
+        'char *cmark_markdown_to_html(const char *text, size_t len, int options);',
+        'libcmark.so'
+    );
+
+    $pointerReturn = $ffi->cmark_markdown_to_html($markdown, strlen($markdown), 0);
+    $html = FFI::string($pointerReturn);
+    FFI::free($pointerReturn);
+
+    return $html;
+}
+
 $markdown = <<<'md'
 # First level title
 
@@ -13,6 +23,4 @@
 
 md;
 
-$html = FFI::string($ffi->cmark_markdown_to_html($markdown, strlen($markdown), 0));
-
-echo $html . PHP_EOL;
+echo markdownToHtml($markdown) . PHP_EOL;