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<?php class MyClass { private static $data = array( 'banana', 'cherry', 'apple' ); private static function sort_by_text( $first, $second ) { return strcasecmp( $first, $second ); } public static function sorted_data() { usort( self::$data, array( __CLASS__, 'sort_by_text' ) ); return self::$data; } } print_r( MyClass::sorted_data() ); $data = array( 'banana', 'cherry', 'apple' ); usort( $data, array( __CLASS__, 'sort_by_text' ) );
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => apple [1] => banana [2] => cherry ) Fatal error: Uncaught TypeError: usort(): Argument #2 ($callback) must be a valid callback, class "" not found in /in/gaFo3:17 Stack trace: #0 /in/gaFo3(17): usort(Array, Array) #1 {main} thrown in /in/gaFo3 on line 17
Process exited with code 255.

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