標簽：php

我試圖像這樣調用數組內的函數：

protected $settings = array(

'prefix' => $this->getPrefix(),

);

expression is not allowed as field of default value

getPrefix()

public function getPrefix()

{

return "hello world";

}

我不能這樣做？

解決方法:

根據受保護的關鍵字判斷,您正在嘗試設置對象屬性.根據PHP manual：

They are defined by using one of the keywords public, protected, or private, followed by a normal variable declaration. This declaration may include an initialization, but this initialization must be a constant value–that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated.

為了設置你的值,把它放到構造函數中：

class Settings

{

protected $settings;

public function __constructor() {

$this->settings = array(

'prefix' => $this->getPrefix(),

);

}

public function getPrefix() {

return "Hello, World!";

}

}

標簽：php

來源： https://codeday.me/bug/20190528/1167788.html

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