将一个函数中创建的 PHP 变量传递给另一个函数

Pass PHP variable created in one function to another

提问by JCHASE11

I am using wordpress and woocommerce ( an e-commerce plugin) to customize a shopping cart. Within my functions.php I am storing data in a variable like so:

我正在使用 wordpress 和 woocommerce（一个电子商务插件）来自定义购物车。在我的functions.php中，我将数据存储在一个变量中，如下所示：

add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );

function add_custom_price( $cart_object ) {
    foreach ( $cart_object->cart_contents as $key => $value ) {
        $newVar = $value['data']->price;
    }
}

I need to be able to use $newVarin a different function so I can echo the result on a different area of the page. For instance, if I had the following function, how would I use $newVarwithin it?

我需要能够$newVar在不同的函数中使用，以便我可以在页面的不同区域回显结果。例如，如果我有以下功能，我将如何$newVar在其中使用？

add_action( 'another_area', 'function_name' );

function function_name() {
    echo $newVar;
}

How can I do this?

我怎样才能做到这一点？

回答by putvande

You could make the variable global:

您可以将变量设为全局：

function add_custom_price( $cart_object ) {
    global $newVar;
    foreach ( $cart_object->cart_contents as $key => $value ) {
        $newVar = $value['data']->price;
    }
}

function function_name() {
    global $newVar;
    echo $newVar;
}

Or, if $newVaris already available in the global scope you could do:

或者，如果$newVar已经在全局范围内可用，您可以执行以下操作：

function function_name($newVar) {
    echo $newVar;
}

// Add the hook
add_action( 'another_area', 'function_name' );

// Trigger the hook with the $newVar;
do_action('another_area', $newVar);

回答by ChunkyBaconPlz

Any reason why you can't call your function from within your foreach loop?

为什么不能从 foreach 循环中调用函数？

function add_custom_price( $cart_object ) {
    foreach ( $cart_object->cart_contents as $key => $value ) {
        $newVar = $value['data']->price;
        function_name($newVar);
    }
}

回答by Emilio Gort

You should use return $variable in your functions:

您应该在函数中使用 return $variable ：

function add_custom_price( $cart_object ) {
  foreach ( $cart_object->cart_contents as $key => $value ) {
    $newVar = $value['data']->price;
  }
  return $newVar;
}

function function_name($newVar) {
//do something with $newVar
}

And use like this:

并像这样使用：

$variable = add_custom_price( $cart_object );

$xxx = function_name($variable);

UPDATE:

更新：

Looking at what @ChunkyBaconPlz said $newVar should be an array:

看看@ChunkyBaconPlz 所说的 $newVar 应该是一个数组：

function add_custom_price( $cart_object ) {
  foreach ( $cart_object->cart_contents as $key => $value ) {
    $newVar[] = $value['data']->price;
  }
  return $newVar;
}

回答by Link of Origin

This is a scope issue. You need to instantiate (create) $newVar outside of the function first. Then it will be view-able by your other function.

这是一个范围问题。您需要先在函数外部实例化（创建）$newVar。然后它可以被您的其他功能查看。

You see, scope determines what objects can be seen other objects. If you create a variable within a function, it will only be usable from within that function. Once the function ends, that variable is eliminated!

你看，范围决定了哪些对象可以被其他对象看到。如果您在函数内创建变量，则它只能在该函数内使用。一旦函数结束，该变量就被消除了！

So to fix, literally just create "$newVar" before you create the function and you should be good to go.

因此，要修复，实际上只需在创建函数之前创建“$newVar”就可以了。

回答by Rakhi

even if its defined global its not working while calling in other function how ever if we call function in other function it seems to be working.

即使它定义的全局它在调用其他函数时不起作用，但是如果我们在其他函数中调用函数它似乎正在工作。

<?php

function one() {
    global $newVar;

        $newVar = "hello";

}

function two() {
    one();
    global $newVar;

    echo $newVar;
}
 two();

?>