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<?php $foo = (1 === '1') ?: 'bar'; var_dump($foo); $foo = (1 === 1) ?: 'bar'; var_dump($foo); $foo = (1 !== 1) ?: $bar; var_dump($foo);
Output for git.master, git.master_jit, rfc.property-hooks
string(3) "bar" bool(true) Warning: Undefined variable $bar in /in/maIRb on line 9 NULL

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