使用PHP插入HTML标记
[英]Using PHP to insert a HTML tag
问题描述
I have this HTML tag (body): 
我有这个HTML标记（正文）：
<body onload="startTime()" background="src/bg3.png">
and I was trying to change background on refresh so I replaced the HTML tag with this PHP code: 并且我试图在刷新时更改背景，因此我用以下PHP代码替换了HTML标签：
<?php
$id = rand(1, 7);
echo "<body onload=".'"'."startTime()".'"'."background=".'"'."src/bg". $id . ".png".'"'.'>';
?>
which returns: 返回：
<body onload="startTime()" background="src/bg5.png">
where the number after bg is a random between 1 and 7. 其中bg之后的数字是1到7之间的随机数。
But the problem is that when I inspect element the body tag is simply: 但是问题是，当我检查元素时，body标签很简单：
<body>
Does PHP only allow HTML code insertion if it's being returned by a function? 如果函数返回了PHP，则只允许插入HTML代码吗？
3 个解决方案
解决方案1
0 2017-04-24 15:48:37
seems you have some problem with quotes .. 似乎您在报价方面有问题..
<?php
$id = rand(1, 7);
echo "<body onload='startTime()' background='src/bg". $id . ".png'>";
?>
解决方案2
0 2017-04-24 15:51:20
Try: 尝试：
echo "<body onload='startTime()' style='background:url('src/bg{$id}.png')>";
Your sting was hard to follow but I think you messed up the concatenation. 你的刺痛很难听，但我认为你搞砸了串联。
Background is part of a style tag. 背景是样式标签的一部分。 I made the Id part of string interpolation rather than more concates and putting single quotes in double works. 我将Id用作字符串插值的一部分，而不是更加简洁，并将单引号放在双引号中。
解决方案3
0 已采纳 2017-04-24 17:13:11
Decided to try using a function again (already tried but didn't work): 决定再次尝试使用功能（已尝试但不起作用）：
function changeBG() {
//generate a random number from min to max
var min = 1, max = 7;
var str1 = "src/bg", str2 = ".png"
var number = Math.floor(Math.random() * max) + min;
var path = str1.concat(number);
path = path.concat(str2);
document.body.background = path;
}
This solved it, thanks to everybody that helped. 感谢所有人的帮助，这个问题得以解决。
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