View difference between Paste ID: Kj9tQAwQ and ve9ceaHJ
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$CSV = fopen("input.csv", "r");
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if($CSV !== FALSE) 
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{
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	$dlc = [];
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	while(! feof($CSV)) 
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		{
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		$dlc = preg_match_all("/DLC-[A-Z0-9]+/s", $data[20], $output_array);
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		print_r(array_values($output_array));
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		$result = preg_match_all("/DLC-[A-Z0-9]+/s", $data[20], $output_array);
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		if($result) {
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    			$dlc = array_merge($dlc, $output_array[0]);
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		}
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fclose($CSV);
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	}
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}
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fclose($CSV);
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$dlc = array_unique($dlc);
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var_dump($dlc);