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<?php function foo() { echo __FUNCTION__, "\n"; return 'key'; } echo "??=\n"; $array = []; $array[foo()] ??= 'default'; echo "\nrough equivalent\n"; $array = []; if (!isset($array[foo()])) { $array[foo()] = 'default'; }
Output for git.master, git.master_jit, rfc.property-hooks
??= foo rough equivalent foo foo

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