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<?php $foo = '1'; $bar = '0'; var_dump($foo ?: $bar); var_dump($foo ?? $bar); var_dump($bar ?: $foo); var_dump($bar ?? $foo);
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "1" string(1) "1" string(1) "1" string(1) "0"

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