Re: Pre/Post inc (Was array conversion)

Richard Quadling wrote:
> On 20 February 2010 11:18,  <[email protected]> wrote:
>> Or:
>>
>> $a = array ('Cats', 'white', 'Dogs', 'black', 'Mice', 'grey', 'Camels', 'brown');
>> $b = '';                                // Just in case it has some leftover value
>> $k = 2* (int) (count ($a)/2);   // ensure even no of terms
>> $i = 0; while ($i < $k)
>>        {
>>        $b[$a[$i++]] = $a[$i++];  // ***
>>        }
>>
>> And this works:
>> $i = 0; $k = array_keys($b);
>> while ($i < count($b)) {        echo '<h5>'.$i.': '.$k[$i].' = '. $b[$k[$i++]].'</h5>'; }
>>
>> 0: Cats = white
>> 1: Dogs = black
>> 2: Mice = grey
>> 3: Camels = brown
>>
>> ( *** I have always been wary of using statements like this because I was unsure when the
>> incrementing would occur, so I tried it.)
>>
>> Clancy
> 
> 
> <?php
> $i = 10;
> echo $i++; // Shows 10 and $i becomes 11
> echo ++$i; // $i becomes 12 and 12 is shown.
> ?>
> 
> Post increment and pre increment.
> 
> No need to be "wary" of them.
> 
> http://docs.php.net/manual/en/language.operators.increment.php
> 

Expanding on what Richard says; there does seem to be a growing number
of people who haven't stopped to learn the very basics of PHP (or
languages in general).

I'd strongly recommend that all those in doubt over the basics take a
few hours out to (re-)familiarise themselves; and there's no finer
resource to do this than the php manual [1]

You'll notice the manual goes as follows:
# Basic syntax
# Types
# Variables
# Constants
# Expressions
# Operators
# Control Structures
# Functions
... more

And that's the order in which you should learn; in short you can't
really program or script without knowing basics through control structures.

Do hope this mail doesn't sound condescending in any way; as it's meant
with the best intentions and really will make you're (working) life a
lot easier. I myself still refer back to these base sections
periodically, and every time I do - a new detail pops out that makes
something easier.

[1] http://docs.php.net/manual/en/langref.php

Many Regards,

Nathan