Comments on: Control Structures

By: Martin Geisler

Martin Geisler — Thu, 29 Nov 2007 07:31:04 +0000

9: Yeah, you’re right! Thanks for pointing it out, I’ll update the text.

By: mickeystinge

mickeystinge — Thu, 29 Nov 2007 03:45:10 +0000

In your example of boolean operations in the If structure section…
if (($x == 0 && $y != 0) || ($x != 0 && $y == 0)) {
// At least one of $x and $y is zero.
}
…surely this is not ‘// At least one of $x and $y is zero’ but true if only one of x or y is zero, but not both ie an exclusive OR function. You would need to code…
if (($x == 0 && $y != 0) || ($x != 0 && $y == 0) || ($x == 0 && $y == 0))
…or simply…
if (($x ==0) || ($y == 0))
…am I right?

By: Andrea

Andrea — Thu, 01 Mar 2007 16:57:58 +0000

I like it and the background and colors make it easy to readn

By: Elias_Maluco

Elias_Maluco — Wed, 27 Jul 2005 21:30:21 +0000

Yes, thank you very much. And I found where you explained about the =>, I just have the bad habbit of jumping sentences while I read. Sorry about that.

By: Martin Geisler

Martin Geisler — Wed, 27 Jul 2005 21:24:21 +0000

I've tried to explain the => syntax in the text, please tell me if that helps or if I could explain it better.

By: Martin Geisler

Martin Geisler — Wed, 27 Jul 2005 21:08:15 +0000

(I’ve edited your comment to include the
that got deleted — HTML tags are not allowed comments, but I had expected them to be escaped…)

As for your question: when looking for the “\n” are you looking at the source of your document? It is only there you’ll see the “\n”. All whitespace are treated like a single space in HTML, so your newlines, tabs, carrige returns, and a bit more are all turned into a single space when displayed by the browser.

The exception to this is content within

tags. There your formatting is preserved. Was that your problem?

By: Elias_Maluco

Elias_Maluco — Wed, 27 Jul 2005 20:50:40 +0000

Also, \n is simply not working here. Im using Apache 2.0.54 and PHP 5.0.4 in Windows XP. When a put \n in a string, it doenst get echoed, but it doesnt break the line neither. So, Ive been using instead.

So, if I try:
echo “Two\nlines”; I get simply “Two lines” printed on the page.
I have to write “Two
lines”; to achieve the same effect;

By: Elias_Maluco

Elias_Maluco — Wed, 27 Jul 2005 20:29:09 +0000

Sorry, but could you explain what the “=>” operator does? You just started using it, but I cant find where do you explained anything about it.

By: Martin Geisler

Martin Geisler — Mon, 18 Jul 2005 19:23:23 +0000

The table code produces the following HTML code, no more, no less:

<table>
<tr>
  <th>Key</th>
  <th>Value</th>
</tr>
<tr>
  <td>Foo</td>
  <td>42</td>
</tr>
<tr>
  <td>Bar</td>
  <td>3.14</td>
</tr>
<tr>
  <td>Baz</td>
  <td>2.71</td>
</tr>
</table>

This HTML code should produce a table similar to the one described above but with no border --- adding border="1" to the <table> tag will give you a border. This has actually nothing with PHP to do, it is a matter of HTML. (Not that this makes the mismatch between the code and the example better --- I'll update the code now.)

By: Jim Davis

Jim Davis — Sat, 16 Jul 2005 15:01:30 +0000

I tried the above table code as it was but it wasn't until I changed it to:

echo "\n";

that it actually showed the table. Is that normal? I tried it the other way but it just showed the numbers but no table I had to add the border= to get the table to show.