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<?php $array = array( 0 => 'val', 2 => 'val', 3 => 'val', 5 => 'val', 7 => 'val' ); [$array] = [...$array]; var_export($array);
Output for 7.4.4 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
'val'
Output for 7.1.25 - 7.1.30, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Parse error: syntax error, unexpected '...' (T_ELLIPSIS), expecting ']' in /in/ST6kG on line 10
Process exited with code 255.

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