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<?php $a = "1234567890"; var_dump(isset($a[0xff])); // false var_dump(isset($a["0xff"])); // true; 10進数の10として認識されている var_dump(isset($a["0zff"])); // false;
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) bool(false)

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