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<?php var_dump( urlencode('12+34 = 37'), rawurlencode('12+34 = 37') );
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.1
string(14) "12%2B34+%3D+37" string(18) "12%2B34%20%3D%2037"