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                # 函數 * * * * * Table of Contents 1. 用戶自定義函數 2. 函數的參數 3. 返回值 4. 可變函數 5. 內部(內置)函數 6. 匿名函數 * * * * * **用戶自定義函數** ~~~ function foo ( $arg_1 , $arg_2 , /* ..., */ $arg_n ) { echo "Example function.\n" ; return $retval ; } ~~~ **return** ~~~ function square ( $num ) { return $num * $num ; } echo square ( 4 ); // outputs '16'. ~~~ **匿名函數** ~~~ $greet = function( $name ) { printf ( "Hello %s\r\n" , $name ); }; $greet ( 'World' ); $greet ( 'PHP' ); ~~~
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