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<?php $str = "Bbbbbbb Bbb\u{00E4}b\u{00E4} Bbbbb\u{00E4}"; var_dump($str); var_dump(strlen($str)); var_dump(substr($str,0,28)); var_dump(['key' => substr($str,0,28)]);
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
string(24) "Bbbbbbb Bbbäbä Bbbbbä" int(24) string(24) "Bbbbbbb Bbbäbä Bbbbbä" array(1) { ["key"]=> string(24) "Bbbbbbb Bbbäbä Bbbbbä" }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(24) "Bbbbbbb Bbbäbä Bbbbbä" int(24) string(24) "Bbbbbbb Bbbäbä Bbbbbä" array(1) { ["key"]=> string(24) "Bbbbbbb Bbbäbä Bbbbbä" }

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