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<?php $a = new SplFixedArray(1); $a[0] = 1; $a->edfed =d; var_dump($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "d" in /in/Qd8Go:5 Stack trace: #0 {main} thrown in /in/Qd8Go on line 5
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant d - assumed 'd' (this will throw an Error in a future version of PHP) in /in/Qd8Go on line 5 object(SplFixedArray)#1 (2) { ["edfed"]=> string(1) "d" [0]=> int(1) }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33
Notice: Use of undefined constant d - assumed 'd' in /in/Qd8Go on line 5 object(SplFixedArray)#1 (2) { ["edfed"]=> string(1) "d" [0]=> int(1) }

preferences:
166.86 ms | 402 KiB | 228 Q