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<?php $string = "B1A23R4CD"; $chars = str_split($string); $output = [[], []]; foreach ($chars as $char) { $output[ctype_alpha($char)][] = $char; // ^^^^^^^^^^^^^^^^^^- false is 0, true is 1 } var_export($output);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => '1', 1 => '2', 2 => '3', 3 => '4', ), 1 => array ( 0 => 'B', 1 => 'A', 2 => 'R', 3 => 'C', 4 => 'D', ), )

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