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<?php $a = "1234567890"; var_dump($a[010], isset($a[010])); // true var_dump($a["010"], isset($a["010"])); // false; 10進数の10として認識されている $a .= "a"; var_dump($a["010"], isset($a["010"])); // true
Output for git.master, git.master_jit, rfc.property-hooks
string(1) "9" bool(true) Warning: Uninitialized string offset 10 in /in/idqXt on line 5 string(0) "" bool(false) string(1) "a" bool(true)

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