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<?php $test = pack('c*', -22); $testU = pack('C*', 234); $testC = chr(-22); $testCU = chr(234); echo $test; echo $testU; echo $testC; echo $testCU; echo $test == $testU; echo $testC == $test; echo $testCU == $test; $uTest = unpack('c*', 'ê'); var_dump($uTest);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 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 - 8.3.7
����111array(2) { [1]=> int(-61) [2]=> int(-86) }
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 ����111array(2) { [1]=> int(-61) [2]=> int(-86) }

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