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<?php $formatted = ['foo' => 'bar', 'foo10' => 'bar10']; $formatted = array_change_key_case($formatted, CASE_UPPER); var_dump($formatted);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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
array(2) { ["FOO"]=> string(3) "bar" ["FOO10"]=> string(5) "bar10" }
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 array(2) { ["FOO"]=> string(3) "bar" ["FOO10"]=> string(5) "bar10" }

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122.7 ms | 402 KiB | 188 Q