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<?php $arr['color_list'] = []; $var[0][0] = 1; $var[0][1] = 2; $var[1][0] = 2; $var[1][1] = 2; $arr['color_list'] = $var; echo json_encode($arr,JSON_PRETTY);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "JSON_PRETTY" in /in/iMPDY:10 Stack trace: #0 {main} thrown in /in/iMPDY on line 10
Process exited with code 255.

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