php 错误：警告：strpos() [function.strpos]：字符串中不包含偏移量 - 找不到解决方案

Error : Warning: strpos() [function.strpos]: Offset not contained in string - can not find solution

提问by user1406271

I know, this question has been asked, but unfortunately, there are no answers how to solve this problem.

我知道，这个问题已经被问到了，但不幸的是，没有答案如何解决这个问题。

This appears in my logfiles:

这出现在我的日志文件中：

PHP message: PHP Warning: strpos(): Offset not contained in string in ... on line 479

PHP 消息：PHP 警告：strpos()：第 479 行中的字符串中不包含偏移量...

Unfortunately, I can not understand what causes this problem and how to fix it. I tested this function many times (with large $text, with short $text, with $spam words and without $spam words) but I never get this error. So, what kind of texts my users submit that cause this error?

不幸的是，我不明白是什么导致了这个问题以及如何解决它。我多次测试了这个函数（用大 $text，用短 $text，用 $spam 词和不带 $spam 词），但我从来没有收到这个错误。那么，我的用户提交的哪些类型的文本会导致此错误？

    if (strposab($text, $spam, 1)) {
    echo "Email addresses and URLs not allowed here";
die;
    }

$spam = array('http','www','hotmail','yahoo','gmail','msn');


function strposab($haystack, $needles=array(), $offset=0) {
$chr = array();
foreach($needles as $needle) {
$res = strpos($haystack, $needle, $offset);
if ($res !== false) $chr[$needle] = $res;
}
if(empty($chr)) return false;
return min($chr);
} 

Second question:

第二个问题：

For some reason this function does not filter the first word of the string. For example in this string function does not find word "hotmail":

出于某种原因，此函数不会过滤字符串的第一个单词。例如在这个字符串函数中找不到单词“hotmail”：

$text = 'hotmail test test test test';

but in this string it finds word " hotmail":

但在这个字符串中，它找到了“hotmail”这个词：

$text = 'test hotmail test test test test';

采纳答案by pilsetnieks

To the first question:

对于第一个问题：

Most likely at one point you're passing an empty string to your function. Offsetin the strposcall indicates from which character it should start searching for $needle. It's 0-based, so if you want to start from the absolute beginning, you either set it to 0 or omit it (it defaults to 0.)

很可能在某一时刻，您将一个空字符串传递给您的函数。Offset在strpos调用中指示它应该从哪个字符开始搜索$needle。它是基于 0 的，因此如果您想从绝对开头开始，您可以将其设置为 0 或省略它（默认为 0。）

To the second question:

对于第二个问题：

As mentioned before, the offset is 0-based, so if $needleyou're searching for is exactly in the beginning of $haystack, it cannot be found if $offsetis 1. With $offset = 1it would be as if you're searching in a string that looks like this: 'otmail test test test test'.

如前所述，偏移量是从 0 开始的，因此如果$needle您要搜索的内容恰好位于 的开头$haystack，则如果$offset为 1 ，则无法找到它。$offset = 1这样就好像您在搜索这样的字符串一样：'otmail test test test test'。

One more thing:

还有一件事：

I suggest you should use stripos, not strposfor your purposes, as it is case-insensitive and will also find words with uppercase letters, if it's something you might need.

我建议你应该使用stripos, 而不是strpos为了你的目的，因为它不区分大小写，如果你可能需要的话，它也会找到带有大写字母的单词。

回答by Alex

The offset value is higher than the length of the string to search in.

偏移值大于要搜索的字符串的长度。

回答by maringtr

To answer your second question - you have two issues in your code. Assuming your text string is:

要回答您的第二个问题 - 您的代码中有两个问题。假设您的文本字符串是：

$text = 'hotmail test test test test';

..and your if statement is

..你的 if 语句是

if (strposab($text, $spam, 1))

First, you're starting at offset 1, while the word "hotmail" is at position 0. So by specifying an offset of 1, you're checking against the String:

首先，您从偏移量 1 开始，而单词“hotmail”位于位置 0。因此，通过指定偏移量 1，您正在检查字符串：

otmail test test test test

...and not

...并不是

hotmail test test test test

Second of all, with "hotmail" being at position 0, your strposab() function will return a value of int(0), which is a non-Boolean value that when used in a Boolean expression evaluates to FALSE. Therefore, you need to use the !== operator in order to avoid type juggling. So the correct if statement to use will be:

其次，当“hotmail”位于位置 0 时，您的 strposab() 函数将返回一个 int(0) 值，这是一个非布尔值，在布尔表达式中使用时计算结果为 FALSE。因此，您需要使用 !== 运算符以避免类型杂耍。因此，要使用的正确 if 语句将是：

if (strposab($text, $spam, 0) !== false)