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run code in 200+ php & hhvm versions
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<?php $data = '5ser@5ebsite.com'; var_dump($data['5onfirmed']); var_dump(isset($data['5onfirmed']));
based on gj5cN
Output for 5.4.0 - 7.2.0
Notice: A non well formed numeric value encountered in /in/7QZgG on line 3 string(1) "5" bool(false)
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.3.29
string(1) "5" bool(true)
Output for 5.0.0 - 5.0.2
string(1) "5" bool(false)