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

问题描述

我在 PHP 中玩弄匿名函数并意识到它们似乎无法访问它们之外的变量.有什么办法可以解决这个问题吗?

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?

示例:

$variable = "nothing";

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

echo $variable;  //output: "nothing"

这将输出无".匿名函数有没有办法访问$variable?

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

推荐答案

是的，使用闭包::>

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

请注意，为了让您能够修改 $variable 并在匿名函数的范围之外检索修改后的值，必须使用 & 在闭包中引用它..

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 &.

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