Question

我编写了以下代码，第二个嵌套的IF语句被忽略了。如果我改变它们的顺序，就会发生同样的事情。我已经尝试了一个elseif语句，但似乎也没有用。

任何想法为什么？我猜这是一个很漂亮的菜鸟问题，所以请欺骗我:)

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fbq('init', '169969516705075');
fbq('track', "PageView");
<?php 

  if($_GET['order_total'] && $_GET['product_id']) {

    $order_total = $_GET['order_total'];
    $product_id = $_GET['product_id'];

    if($product_id === 8421 || 1925 || 1932) {
        $output = "fbq('track', 'Purchase', {value: '$order_total', currency: 'USD'});";
        echo $output;
    }
    if($product_id === 1647) {
        $free_output = "fbq('track', 'CompleteRegistration');";
        echo $free_output;
    }  
  }
  if (is_cart()) {
    $output = "fbq('track', 'AddToCart');";
    echo $output;
  }
  if(is_checkout()) {
    $output = "fbq('track', 'InitiateCheckout');";
    echo $output;
  }
  if (is_wc_endpoint_url( 'order-received' )) {
    $output = "fbq('track', 'Purchase', {value: '$order_total', currency: 'USD'});";
    echo $output;
  }

   ?></script>
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Answer 1

其他答案解决了您的核心问题 - 这就是PHP没有按照您的想法执行此声明：

if ($product_id == 8421 || 1925 || 1932) {...

这总是评价为正，因为你说：

if $product_id == 8421 (which does a comparison as intended)
OR
1925 (which is not a comparison, but rather is a non-zero integer, which is "truthy")
OR
1932 (which is another non-zero integer, which is also "truthy")
then...

所以，作为编码风格的问题，只要我检查的是多个值，我就喜欢使用in_array：

if ( in_array( $product_id, array( 1925, 1932, 8421 ) ) {...

但是，您还有更多事情要做，我也想帮助您。

WordPress最佳做法不会将您的代码放在模板文件的顶部，而是放在函数文件中。

因此，请使用相同的代码，但改为将其更改为主题的functions.php文件。

请注意，它将基于wp_head钩子（我已经包含在下面）来获得CALLED，这样可以保护模板文件不受逻辑/功能影响：

// First, hook into the "wp_head" so that this is output in the head 
add_action('wp_head','facebook_output');

<?php  
// This function is called by the 'wp_head' action above
function facebook_output() { 
    // Close the PHP tag to output some script simply
    ?>
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        fbq('init', '169969516705075');
        fbq('track', "PageView");
<?php  // Re-open the PHP tag so we can do our PHP logic
    if($_GET['order_total'] && $_GET['product_id']) {

        $order_total = $_GET['order_total'];
        $product_id = $_GET['product_id'];

        // For maintainability and readability, put the array(s) of values into variables
        $products_purchase = array(8421, 1925, 1932);
        $products_registration = array(1647);

        // Check if the product_id is in the array
        if( in_array( $product_id, $products_purchase ) ) {
            // No need to assign to $output and then echo - just echo
            echo "fbq('track', 'Purchase', {value: '$order_total', currency: 'USD'});";
        }

        if( in_array( $product_id, $products_registration ) ) {
            echo "fbq('track', 'CompleteRegistration');";
        }  
    }

    if ( is_cart() ) {
        echo "fbq('track', 'AddToCart');";
    }

    if( is_checkout() ) {
        echo "fbq('track', 'InitiateCheckout');";
    }

    if ( is_wc_endpoint_url( 'order-received' ) ) {
        echo "fbq('track', 'Purchase', {value: '$order_total', currency: 'USD'});";
    }
    // Close the PHP tag again to output the straight script
    ?>
    </script>
    <noscript><img height="1" width="1" style="display:none"
src="https://www.facebook.com/tr?id=169969516705075&ev=PageView&noscript=1"
/></noscript>
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<?php // And finally re-open the PHP tag
}

Answer 2

if($product_id === 8421 || $product_id ===1925 || $product_id ===1932)

是这样做的方法

IF语句忽略第二个嵌套的IF语句

2 个答案: