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run code in 150+ php & hhvm versions
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<?php $str_utf8 = 'Qпароль11'; $str_utf8 = iconv('UTF-8', 'Windows-1251', $str_utf8); $login = $str_utf8; $password = $str_utf8; //iconv('UTF-8', 'Windows-1251', $str_utf8); if ((preg_match('#.#u', $login)) or (preg_match('#.#u', $password))){ $login = iconv('UTF-8', 'CP1251', $login); $password = iconv('UTF-8', 'CP1251', $password); echo('utf-8');} var_dump($login); var_dump($password); ?>
Output for 5.0.0 - 5.5.34, 5.6.7 - 5.6.20, 5.6.28, hhvm-3.12.0, 7.0.0 - 7.0.5, 7.0.14 - 7.1.0
string(9) "Q�����11" string(9) "Q�����11"
Output for 7.0.6
Fatal error: Uncaught Error: Call to undefined function iconv() in /in/amSm8:3 Stack trace: #0 {main} thrown in /in/amSm8 on line 3
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.5.35, 5.6.21
Fatal error: Call to undefined function iconv() in /in/amSm8 on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: iconv() in /in/amSm8 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: iconv() in /in/amSm8 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: iconv() in /in/amSm8 on line 3