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<?php class Foo { $arr = array("test"); function bar($str) { if ( is_callable( self::$arr[0] ) ){ echo self::$arr[0]($str); } } static function test($var) { echo "Testing: $var\n"; } } (new Foo)->bar("bla");
Output for 5.5.24 - 5.5.31, 5.6.8 - 5.6.17, 7.0.0 - 7.0.2
Parse error: syntax error, unexpected '$arr' (T_VARIABLE), expecting function (T_FUNCTION) in /in/8mZnd on line 4
Process exited with code 255.

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