$ i = 0是否相等？ [英] Does $i = 0 equal nothing?

问题描述

在$ i = 0中，0与0相同或是否为1？


在表单中我有这两个字段 - file 和 file_new 。只有一个（希望）应该包含一个值。我必须确定哪一个有值来确定要执行哪个函数。


[PHP] $ file = mysql_real_escape_string（$ _ POST [''file'']）;

$ file_new = mysql_real_escape_string（$ _ POST [''file_new'']）;


$ i = 0;

if（$ file > $ i AND $ file_new< $ i）

{

函数文件（）;

}

else

{

funtion file_new（）;

} [/ PHP]


我我想我可以放弃if语句的第二部分，除非这有助于我确保只有一个变量包含一个值。如果file_new还包含一个值，我可以返回一条错误消息，说明表格中只能填写其中一个字段。


这是否有效？

或者OR更好： [PHP]

if（$ file！=''''AND $ file_new ==''''）{

运行此代码

}


if（$ file ==''''AND $ file_new！=''''）{

运行此代码

}


if（$ file！=''''AND $ file_new！='''' '）{

运行此代码

}


[/ PHP]


谢谢。

In $i = 0, is 0 the same as nothing or does it count as 1?

In a form I have these two fields - file and file_new. Only one (hopefully) should contain a value. I have to determine which one has a value to determine which function to execute.

[PHP]$file = mysql_real_escape_string($_POST[''file'']);
$file_new = mysql_real_escape_string($_POST[''file_new'']);

$i = 0;
if ($file > $i AND $file_new < $i)
{
function file();
}
else
{
funtion file_new();
}[/PHP]

I guess I could just leave off the second part of the if statement, unless this would help me to make sure that only one variable contains a value. If file_new also contained a value I could return an error message saying that only one of these fields can be filled out on the form.

Will this work or no?

OR is this better: [PHP]
if ($file != '''' AND $file_new == '''') {
run this code
}

if ($file == '''' AND $file_new != '''') {
run this code
}

if ($file != '''' AND $file_new != '''') {
run this code
}

[/PHP]

Thanks.

推荐答案

i = 0，0与0相同或是否为1？


In我有这两个字段的表单 - 文件和 file_new 。只有一个（希望）应该包含一个值。我必须确定哪一个有值来确定要执行的函数。


[PHP]

i = 0, is 0 the same as nothing or does it count as 1?

In a form I have these two fields - file and file_new. Only one (hopefully) should contain a value. I have to determine which one has a value to determine which function to execute.

[PHP]

file = mysql_real_escape_string（

file = mysql_real_escape_string(

_POST [''file'']）;

_POST[''file'']);

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