我想创建表单以将文件上传到img dir(我知道该怎么做(，并将HTML代码和php变量插入数据库(工作正常(，问题是当我从数据库中获取html代码时，它显示<img src=img/$rand>，我显示变量的结果而不是名称， 对不起，我的英语不好
这是我的完整代码：
<?php
$connect = mysqli_connect("localhost", "root", "", "testing");
$rand = substr(md5(microtime()),rand(0,26),5);
?>
<!DOCTYPE html>
<html>
<head>
<title>Insert and Display Images From Mysql Database in PHP</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<br /><br />
<div class="container" style="width:500px;">
<h3 align="center">Insert and Display Images From Mysql Database in PHP</h3>
<br />
<form method="post" enctype="multipart/form-data">
<input type="file" name="image" id="image" />
<br />
<input type="submit" name="insert" id="insert" value="Insert" class="btn btn-info" />
</form>
<?php
if(isset($_POST['insert'])){
$fu = $_FILES['image'];
$image_tmp_name= $_FILES['image']['tmp_name'];
$image_name = $_FILES['image']['name'];
move_uploaded_file($image_tmp_name,"img/$image_name");
rename("img/$image_name", "img/$rand");
//echo "<img class='iwalls' data-toggle='modal' data-target='' src='img/$image_name' alt='Loading...'>";
}
?>
<?php
if(isset($_POST["insert"]))
{
$file = '<img src=img/$rand>';
$sql = "INSERT INTO tbl_images(name) VALUES ('$file')";
if(mysqli_query($connect, $sql))
{
echo '<script>alert("Image Inserted into Database")</script>';
} else{
echo '<script>alert("Failed")</script>';
}
}
?>
<br />
<br />
<table class="table table-bordered">
<tr>
<th>Image</th>
<?php
$query = "SELECT * FROM tbl_images ORDER BY id DESC";
$result = mysqli_query($connect, $query);
while($row = mysqli_fetch_array($result))
{
echo "<div>";
echo $row ['name'];
echo "</div>";
}
?>
</tr>
</table>
</div>
</body>
</html>
<script>
$(document).ready(function(){
$('#insert').click(function(){
var image_name = $('#image').val();
if(image_name == '')
{
alert("Please Select Image");
return false;
}
else
{
var extension = $('#image').val().split('.').pop().toLowerCase();
if(jQuery.inArray(extension, ['gif','png','jpg','jpeg']) == -1)
{
alert('Invalid Image File');
$('#image').val('');
return false;
}
}
});
});
</script>
使用单引号时，字符串将保持原样。
$rand = "hello.png";
$file = '<img src=img/$rand>';
// $file is <img src=img/$rand>
字符串插值需要双引号
$file = "<img src=img/$rand>";
// $file is <img src=img/hello.png>;