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<?php $arrays = [['00','01'],['10','11'],['20','11']]; $indexes = []; foreach($arrays as $array){ list('0'=>$indexes[]) = $array; } var_dump($indexes);
Output for 7.1.0 - 7.1.33, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(3) { [0]=> string(2) "00" [1]=> string(2) "10" [2]=> string(2) "20" }
Output for 5.6.38
Parse error: syntax error, unexpected ''0'' (T_CONSTANT_ENCAPSED_STRING), expecting ',' or ')' in /in/jHN0p on line 8
Process exited with code 255.

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