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<?php var_dump(json_decode('[{"columnConstant":1,"operatorConstant":2,"value":"hello"},{"columnConstant":2,"operatorConstant":1,"value":"world"}]'));
based on CXq9n
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
array(2) { [0]=> object(stdClass)#1 (3) { ["columnConstant"]=> int(1) ["operatorConstant"]=> int(2) ["value"]=> string(5) "hello" } [1]=> object(stdClass)#2 (3) { ["columnConstant"]=> int(2) ["operatorConstant"]=> int(1) ["value"]=> string(5) "world" } }