php匿名函数中的变量 [英] php variables in anonymous functions

问题描述

我在PHP中使用匿名函数进行游戏，并意识到他们似乎没有达到他们之外的变量。
是否有办法解决这个问题？

示例：

  $ variable =nothing; 
 $ b functionName（someArgument，function（）{
 $ variable =something; 
}）; 
 
 echo $ variable; 
  

输出：nothing。有没有什么办法可以让匿名函数访问$变量？

解析方案

是的， php.net/closure>使用闭包：

  functionName（someArgument，function（）use（& $ variable）{
 $ variable =something; 
}）; 
  

请注意，为了您能够修改 $ variable 并在匿名函数范围外检索修改后的值，它必须使用& 来引用闭包。

I was playing around with anonymous functions in PHP and realized that they don't seem to reach variables outside of them. Is there any way to get around this problem?

Example:

$variable = "nothing";

functionName(someArgument, function() {
  $variable = "something";
});

echo $variable;

Will output: "nothing". Is there any way that the anonymous function can access the $variable?

解决方案

Yes, use a closure:

functionName(someArgument, function() use( &$variable) {
  $variable = "something";
});

Note that in order for you to be able to modify $variable and retrieve the modified value outside of the scope of the anonymous function, it must be referenced in the closure using &.

这篇关于php匿名函数中的变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！