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<?php $query_string = [ 'one' => 1, 'two' => '', 'three' => null, // gets omitted 'four' => ' ', // gets encoded 'five' => "&test=test" // gets encoded ]; echo http_build_query($query_string); echo "\n---\n"; echo http_build_query($query_string, '', '&amp;'); echo "\n\n\n\n\n";
Output for git.master
one=1&two=&four=+&five=%26test%3Dtest --- one=1&amp;two=&amp;four=+&amp;five=%26test%3Dtest

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