如何使用 PHP 在单独的行中显示 SQL 结果？

Question

So, I have this little search engine Im working on, where I can look for error messages, and as a result, I get links to known solutions, and other information It's something I use for my work as tech support engineer I spend most of my days just googling things and looking into different internal locations for solutions to known issues I wanted to build a one stop shop where I can enter an error code, and I get all related information to it

For this I created a database, which has 4 columns: Error Name: the error code I'm looking for KBs: knowledge base articles related to that error Other Links: links to non-company sites with solutions to the same error Cases: internal case numbers

So, if I search for Error1, I get that information, and it's fine if I just have one link for each one of them, but usually, I have multiple sources for any named error

So, on the database, for example I have the column Cases, populated with several case numbers (separated by a comma) And the php I have right now, is showing me the results as:

123,234,345,456,567

And I would like to display that as:

123
234
345
456
567

The code I have for this is:

$sql = "SELECT errorname, kbs, otherinfo, cases FROM issues WHERE id = $id";

<?php echo $row['cases']; ?>

Any suggestions?

Answer 1

One of the most important skills in programming is breaking the problem down .

All the details about the database, and why you're building it, are completely irrelevant to the current problem you're trying to solve, which can be written as:

I have a list of items in a comma-separated string. I want to display each item on a separate line.

What is relevant is where you're viewing the output; I'm going to guess you're outputting HTML, so all you really need to know is that a line break in HTML is spelled <br>

So we can re-word the problem more specifically:

I have a string separated by , . I want it to be separated by <br> instead.

Thinking about other ways of rewording this, you might easily come up with:

I want to replace every , in my string with <br>

Then you look in the PHP manual, and you find a function called str_replace whose summary reads:

Replace all occurrences of the search string with the replacement string

I'll leave the actual PHP code to you; if you can't figure out from there, you should probably give up and become a farmer or something 😉

---

There are of course other variations of the problem, such as:

For each item, I want to output an item in a bulleted list

Which leads you to:

• the concisely named HTML <ul> and <li> elements ("unordered list" and "list item", respectively) ...
• ... the helpfully named foreach loop ...
• ... and the alarmingly named explode function which separates a string into items

Answer 2

If you want to render it for HTML you've to use

<?php echo $row['cases'] . '<br>'; ?>

If you want to have a line break in the HTML-source code too you can write

<?php echo $row['cases'] . "<br>\n"; ?>

If you want to render it for Text files you've to use this:

<?php echo $row['cases'] . "\n"; ?>

For other file formats it might have to be noted differently but you've to define which file-format you use then.