PHP 错误:未定义的偏移量:1 [英] PHP Error: Undefined offset: 1
问题描述
看起来这可能是处理数组的错误,但我无法弄清楚.我真的只是从 PHP 开始,这有点令人生畏.任何帮助将不胜感激!这是我的代码:
It seems like this might be an error dealing with arrays, but I can't figure it out. I'm really just starting with PHP and this is getting to be a little intimidating. Any help would be greatly appreciated! here is my code:
<?php echo "<h1>Choose a Poll!</h1>";
$read = file('poll_topics.txt');
$data = array( );
foreach($read as $lines){
list($key,$v) = explode("|","$lines");
$data[$key] = $v;
}
foreach ($data as $k=>$desc){
echo "<ul><li><a href='take_a_poll.php?poll=$k'>$k</a> - $desc </li></ul>";
}
?>
这是文本文件中的内容:
Here is what is in the text file:
Instruments|What kind of instruments do you like?
Music|What type of music do you like best?
我应该澄清:错误是第 20 行,或者说 list($key,$v) = expand...
I should clarify:
The error is line 20, or where it says list($key,$v) = explode...
推荐答案
您在某处有一个空行.这就是为什么 explode()
只会返回一个空的 $key,而没有任何东西可以分配给 $v.这就是它打印该通知的时间.
You have an empty line somewhere. That's why explode()
will return only an empty $key, but have nothing to assign to the $v. And that's when it prints that notice.
您可以稍微重写一下以忽略此类情况:
You can rewrite it a bit to ignore such cases:
foreach ($read as $lines) {
$key = strtok($lines, "|");
$v = strtok("|");
if ($v) {
$data[$key] = $v;
}
}
这也将避免在最终的 $data 数组中出现空条目.
This will also avoid an empty entry in your final $data array.
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