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run code in 200+ php & hhvm versions
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<?php $_req = array( "parameter" => " {\"config\":{\"siteId\":\"1234567\", \"templateId\":\"221\"}} " ); print_r($_req);
based on sNaRI
Output for 5.6.0 - 5.6.30, hhvm-3.18.4 - 3.21.0, 7.0.0 - 7.3.0beta1
Array ( [parameter] => {"config":{"siteId":"1234567", "templateId":"221"}} )