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<?php $csv = <<<CSV id: 10, location: Canada, people: 12 id: 10, location: United States, people: 15 id: 15, location: England, people: 19 id: 16, location: India, people: 20 id: 16, location: Germany, people: 9 CSV; foreach (explode(PHP_EOL, $csv) as $line) { $firstColumn = strtok($line, ','); if (!isset($lookup[$firstColumn])) { echo $line . PHP_EOL; $lookup[$firstColumn] = true; } }
Output for rfc.property-hooks, git.master, git.master_jit
id: 10, location: Canada, people: 12 id: 15, location: England, people: 19 id: 16, location: India, people: 20

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