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flag class_exists as impure per vimeo/psalm#3975 (#4004)

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`class_exists()` interacts with PHP's autoloader feature, which allows
user-defined behaviour to take place when PHP tries to load a given
class or interface.
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SignpostMarv 2020-08-17 20:48:48 +01:00 committed by GitHub
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src/Psalm/Internal/Codebase/Functions.php
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@ -354,6 +354,7 @@ class Functions
'mt_rand', 'rand', 'random_int', 'random_bytes',
'wincache_ucache_delete', 'wincache_ucache_set', 'wincache_ucache_inc',
'class_alias',
'class_exists', // impure by virtue of triggering autoloader
// php environment
'ini_set', 'sleep', 'usleep', 'register_shutdown_function',