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run code in 500+ PHP versions simultaneously
<?php function print_line(string $output): void { echo $output . PHP_EOL; } $rel = [ 'noopener' => true, 'external' => false, 'nofollow' => true, ]; print_line(implode(" ", array_keys($rel)));
Output for git.master_jit, git.master
noopener external nofollow

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