Question

我发现了一些奇怪的行为，无法解释发生了什么：

<!DOCTYPE html>
<html>
<head>
<link href="https://cdnjs.cloudflare.com/ajax/libs/foundation/5.5.2/css/normalize.min.css" rel="stylesheet" type="text/css" />
<link href="https://cdnjs.cloudflare.com/ajax/libs/foundation/5.5.2/css/foundation.min.css" rel="stylesheet" type="text/css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/foundation/5.5.2/js/vendor/modernizr.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/foundation/5.5.2/js/vendor/jquery.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/foundation/5.5.2/js/foundation.min.js"></script>
  
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>  
  <div class="row">
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
    <div class="small-6 columns text">i some text</div>
  </div>
</body>
</html>

给出：

$e = 3;
echo "with array " . print_r($e);

为什么？

Answer 1

在任何输出之前完成连接：

echo "with array " . print_r($e);

是

获取print_r的结果。 print_r打印3和returns TRUE。
with array字符串与TRUE连接。 TRUE的字符串表示形式为1。
摘要：要输出的字符串为3with array 1

如果您希望print_r 返回值而不是打印它，请使用它的第二个参数：

echo "with array " . print_r($e, true);  // `with array 3`

echo和print_r的奇怪输出

1 个答案: