类内的 PHP 全局变量作用域
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PHP global variable scope inside a class
提问by roamcel
I have the following script
我有以下脚本
myclass.php
我的类.php
<?php
$myarray = array('firstval','secondval');
class littleclass {
private $myvalue;
public function __construct() {
$myvalue = "INIT!";
}
public function setvalue() {
$myvalue = $myarray[0]; //ERROR: $myarray does not exist inside the class
}
}
?>
Is there a way to make $myarray available inside the littleclass, through simple declaration? I don't want to pass it as a parameter to the constructor if that was possible.
有没有办法通过简单的声明使 $myarray 在 littleclass 中可用？如果可能的话，我不想将它作为参数传递给构造函数。
Additionally, I hope that you actually CAN make global variables visible to a php class in some manner, but this is my first time facing the problem so I really don't know.
此外，我希望您实际上可以以某种方式使全局变量对 php 类可见，但这是我第一次遇到这个问题，所以我真的不知道。
回答by Nick Shvelidze
include global $myarrayat the start of setvalue()function.
包括global $myarray在setvalue()函数的开头。
public function setvalue() {
global $myarray;
$myvalue = $myarray[0];
}
UPDATE:
As noted in the comments, this is bad practice and should be avoided.
A better solution would be this: https://stackoverflow.com/a/17094513/3407923.
更新：
如评论中所述，这是不好的做法，应该避免。
更好的解决方案是：https: //stackoverflow.com/a/17094513/3407923。
回答by macjohn
in a class you can use any global variable with $GLOBALS['varName'];
在一个类中，您可以使用任何全局变量 $GLOBALS['varName'];
回答by jbrtrnd
Construct a new singleton class used to store and access variables you want to use ?
构造一个新的单例类，用于存储和访问要使用的变量？
回答by Amelia
Why dont you just use the getter and setter for this?
为什么不为此使用 getter 和 setter？
<?php
$oLittleclass = new littleclass ;
$oLittleclass->myarray = array('firstval','secondval');
echo "firstval: " . $oLittleclass->firstval . " secondval: " . $oLittleclass->secondval ;
class littleclass
{
private $myvalue ;
private $aMyarray ;
public function __construct() {
$myvalue = "INIT!";
}
public function __set( $key, $value )
{
switch( $key )
{
case "myarray" :
$this->aMyarray = $value ;
break ;
}
}
public function __get( $key )
{
switch( $key )
{
case "firstval" :
return $this->aMyarray[0] ;
break ;
case "secondval" :
return $this->aMyarray[1] ;
break ;
}
}
}
?>
回答by djot
$GLOBALS['myarray'] = array('firstval','secondval');
In the class you just might use $GLOBALS['myarray'].
在课堂上，您可能只使用 $GLOBALS['myarray']。
