这个PHP代码有什么问题
[英]What's wrong with this php code
问题描述
For some reason this php code won't echo. 
由于某种原因，此php代码不会回显。 I can't seem to figure out why. 我似乎不知道为什么。
<?php
function prob1(){
$sum1 = 0;
for($i=1; $i<11; $i++){
$sum1 = $sum1 + $i;
}
echo "Sum of numbers 1 - 10 is:". $sum1;
}
prob1();
?>
Any ideas? 有任何想法吗？
UPDATE: Here is the entire web page that it exists in.
<html>
<head><title>Lab 13</title></head>
<body>
<h1>Problem 1:</h1>
<?php
function prob1(){
$sum1 = 0;
for($i=1; $i<11; $i++){
$sum1 = $sum1 + $i;
}
echo "Sum of numbers 1 - 10 is:". $sum1;
}
prob1();
?>
<p>
A. This is a server-side program. The code is executed on a web server and the results are returned to the user as HTML.
<br />
B. You can use javascript to accomplish the same calculation. Javascript code is executed client-side; meaning the user's machine will execute the code and return the result.
<br />
C. There is no need to use PHP in a scenario like this. Calculations such as these are more efficiently executed client-side.
<br />
</p>
<h1>Problem 2</h1>
<?php
function prob2($x){
$y = 0;
if ($x<5)
{
$y = pow($x, 3) + 5*($x, 2) + 3;
}
else
{
$y = pow($x, 3) - 9*pow($x, 2) + 12;
}
echo "For X=" . $x . " Y=" + $y;
}
prob2(3);
prob2(8);
?>
<p>A. Yes, you can write the same code using javascript. In this situation, it wouldn't be necessary to use php unless you wanted to hide the calculation from the user.</p>
</body>
</html>
5 个解决方案
解决方案1
6 已采纳 2010-11-12 21:45:54
Uh, you want the sum of the number 1 thru 10 but you're looping 16 times. 嗯，您想要数字1到10的总和，但是您要循环16次。
<?php
function prob1(){
$sum1 = 0;
for($i=1; $i<=10; $i++){
$sum1 += $i;
}
echo "Sum of numbers 1 - 10 is:". $sum1;
}
prob1();
?>
解决方案2
3 2010-11-12 21:47:58
question : $i<16 = Sum of numbers 1 - 10 ? 问题： $i<16 = Sum of numbers 1 - 10 ？
<? function prob1() { echo "Sum of numbers 1 - 10 is ", array_sum(range(1,10)); } prob1();
updated 更新
$y = pow($x, 3) + 5*($x, 2) + 3;
should be 应该
$y = pow($x, 3) + 5*pow($x, 2) + 3;
解决方案3
1 2010-11-12 21:47:08
It's working. 工作正常 But your label is wrong though, it should be " Sum of numbers 1 - 15 ". 但是您的标签是错误的，应该是“ 数字1-15的总和 ”。 Here: http://codepad.org/TEvtB1hL 此处： http ： //codepad.org/TEvtB1hL
解决方案4
1 2010-11-12 22:14:20
You've got a problem here: 您在这里遇到问题：
$y = pow($x, 3) + 5*($x, 2) + 3;
This line should be 这行应该是
$y = pow($x, 3) + 5*pow($x, 2) + 3;
After I changed that, the page loaded for me normally. 更改后，页面正常为我加载。
(Also echo "For X=" . $x . " Y=" + $y; should be echo "For X=" . $x . " Y=" . $y; ). （还echo "For X=" . $x . " Y=" + $y;应该echo "For X=" . $x . " Y=" . $y; ）。
解决方案5
0 2010-11-12 21:49:06
Either PHP is not functioning properly on the server, or this is saved as an .htm file, not .php. PHP可能在服务器上无法正常运行，或者被另存为.htm文件而不是.php。
When this is executed, you get a few parse errors. 执行此操作时，您会遇到一些解析错误。 They are: 他们是：
Parse error: syntax error, unexpected ',' in /var/duck/dork.php on line 36
line 36 is 第36行是
$y = pow($x, 3) + 5*($x, 2) + 3;
It is missing a pow after the 5*. 5 *之后缺少pow 。
Next, take a look at the line 接下来，看看线
echo "For X=" . $x . " Y=" + $y;
The + should be a '.' +应该是一个'。 to concatenate $y to that string. 将$ y连接到该字符串。 Even better, use double quotes for the templating purpose they are intended for.. and add a <BR> so the output is not on the same line. 更好的是，将双引号用于其预期的模板用途。并添加<BR>以使输出不在同一行上。
echo "For X=$x Y=$y <br>";
Here's the complete, working code. 这是完整的工作代码。
<html>
<head><title>Lab 13</title></head>
<body>
<h1>Problem 1:</h1>
<?php
function prob1(){
$sum1 = 0;
for($i=1; $i<11; $i++){
$sum1 = $sum1 + $i;
}
echo "Sum of numbers 1 - 10 is: $sum1";
}
prob1();
?>
<p>
A. This is a server-side program. The code is executed on a web server and the results are returned to the user as HTML.
<br />
B. You can use javascript to accomplish the same calculation. Javascript code is executed client-side; meaning the user's machine will execute the code and return the result.
<br />
C. There is no need to use PHP in a scenario like this. Calculations such as these are more efficiently executed client-side.
<br />
</p>
<h1>Problem 2</h1>
<?php
function prob2($x){
$y = 0;
if ($x<5)
{
$y = pow($x, 3) + 5*pow($x, 2) + 3;
}
else
{
$y = pow($x, 3) - 9*pow($x, 2) + 12;
}
echo "For X=$x Y=$y";
echo "<br>";
}
prob2(3);
prob2(8);
?>
<p>A. Yes, you can write the same code using javascript. In this situation, it wouldn't be necessary to use php unless you wanted to hide the calculation from the user.</p>
</body>
</html>
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