php 输出数组函数调用函数,php – 无法在数组中调用函数
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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