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<?php $closure = function () { echo "hello world, I am a closure"; }; var_dump($closure); var_dump(gettype($closure)); var_dump(is_object($closure));
Output for 8.4.1 - 8.4.2
object(Closure)#1 (3) { ["name"]=> string(21) "{closure:/in/s23qj:3}" ["file"]=> string(9) "/in/s23qj" ["line"]=> int(3) } string(6) "object" bool(true)
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.4, 8.3.6 - 8.3.15
object(Closure)#1 (0) { } string(6) "object" bool(true)
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 object(Closure)#1 (0) { } string(6) "object" bool(true)

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