php callable

php callable

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All of these cases are correctly recognized as callbacks by the 'callable' type hint, however. Thus, the following code will produce an error "Fatal error: Call to undefined function foo::doStuff() in /tmp/code.php on line 4": <?php c,All of these cases are correctly recognized as callbacks by the 'callable' type hint, however. Thus, the following code will produce an error "Fatal error: Call to undefined function foo::doStuff() in /tmp/code.php on line 4": <?php c,All of these cases are correctly recognized as callbacks by the 'callable' type hint, however. Thus, the following code will produce an error "Fatal error: Call to undefined function foo::doStuff() in /tmp/code.php on line 4": <?php c,The valid ones are supposed to have only 2 entries, the first of which is an object or a string, and the second a string. callable_name. Receives the "callable name". In the example below it is "someClass::someMethod". Note, however, t, 在PHP 4 最早稱 callback ，PHP 5.3 引入 closure 與 anonymous function ，PHP 5.4 則新增 callable type hint。 所以在PHP 中， callback 、 closure 、 anonymous function ，與 callable ，事實上指的是同一件事情，但因為底層用的都是 Closure 物件，通常統稱為closure。, 其實PHP的Variable Functions就已經有一些彈性，讓一些需要使用自定函數傳給函數或方法使用時，比較有彈性。不過這樣還是需要在Global Scope定義一個函數，多少會增加一些干擾。 從PHP5.3開始，PHP開始支援匿名函數，讓一些需要彈性的場合更方便。 參考： * PHP: Anonymous functions - Manual

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