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<?php $obj = new StdClass(); $obj->a = 'aaa'; $obj->b = 'bbb'; var_dump(implode('","',(array)$obj)); $ar = ['x','y', 'w'=>'z']; var_dump(json_encode($ar));
Output for 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(9) "aaa","bbb" string(25) "{"0":"x","1":"y","w":"z"}"

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162.13 ms | 403 KiB | 210 Q