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- isset($a['key'])
- array_key_exists('key', $a)
- $a = array('key1' => 'フーバー', 'key2' => null);
- isset($a['key1']); // true
- array_key_exists('key1', $a); // true
- isset($a['key2']); // false
- array_key_exists('key2', $a); // true
- isset($var[$key]); // silent but misses null values
- array_key_exists($key, $var); // works but warning if $var not defined/array
- if (isset($var[$key]) ||
- isset($var) && is_array($var) && array_key_exists($key, $var)) ...
- if (isset($var) && is_array($var) && array_key_exists($key, $var)) ...
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