diff --git a/src/languages/php.js b/src/languages/php.js
index 972083e4b9..3b0b04c3e5 100644
--- a/src/languages/php.js
+++ b/src/languages/php.js
@@ -126,6 +126,9 @@ export default function(hljs) {
         illegal: '[$%\\[]',
         contains: [
           hljs.UNDERSCORE_TITLE_MODE,
+          {
+            begin: '=>' // No markup, just a relevance booster
+          },
           {
             className: 'params',
             begin: '\\(', end: '\\)',