Test failure linking to PHP built-in function

Migrated issue

Reported by: jhodgdon

On #2937926: Namespace URLs don't work without branch, a test failed that was unrelated to the patch. We need to investigate what is going on and fix it.

fail: [Other] Line 202 of sites/all/modules/api/tests/api_link_code.test:
Linking to a PHP function Got: strpos and expected strpos

in ApiTestLinkCode::testApiLinkCode

Related issue: Issue #2937926