Array in PHP

[Deepzone]

I use print_r to show display the content of two arrays. Apart from starting element (I guess), would there be any difference in terms of looping through the array. Please see the sample below:

 

Content of $col (from parm using $func_get_args)

Array ( [1] => a [2] => b [3] => c )

 

 

Content of $colarray (hardcoded)

Array ( [0] => a [1] => b [2] => c )

[requinix]

Arrays are arrays, you can loop through them all the same way.

[Deepzone]

Thanks for your reply. As you can see, the one I got it from parm starts from element 1 (I guess [1] means element 1) so I just worry if there will be any difference between two. Any idea why wasn't it filled by element 0?

[requinix]

No difference besides the indexing. What's the code that gets it?

[exeTrix]

It depends how you plan to spin over the array. you'll be able to use a foreach loop but anything that requires keys to be referenced like for loops you'll have to change the starting offset.

 

Here's some examples:

$array = array( 1 => 'first', 2 => 'second', 3 => 'third' );
foreach( $array as $element ){
echo $element . "<br />";
}
//prints first second third
//or we could reset the keys then iterate
$array = array_values( $array );
$count = count( $array );
for( $x = 0; $x < $count; $x++){
echo $array[$x] . "<br>";
}
//or if you want to be a right geek
$iterator = new ArrayIterator( $array );
while( $iterator->valid() ){
echo $iterator->current() . "<br />";
$iterator->next();
}

 

As for why element 0 wasn't used I'm not sure... Default behaviour in most languages when it comes to arrays is to start from 0.

Edited February 21, 2013 by exeTrix

[Deepzone]

No difference besides the indexing. What's the code that gets it?

I use te following to grab the value from parm:

$func_num_args = func_num_args();

$func_get_args = func_get_args();

if ($func_num_args > 1) {

$column = $func_get_args;

 

}

Note: I always ignore the first parm.

[exeTrix]

Just looking at the code above you don't need:

 

$func_get_args = func_get_args();

 

Why not do this:

$argsCount = func_num_args();
if( $argsCount > 1 ){
   $column = func_get_args();
}

 

 

Note: I always ignore the first parm.

 

By any chance are you unsetting $column[0] later in the script which would cause the element at offset 0 to be remove, hence the array keys starting from 1?

[Deepzone]

 

By any chance are you unsetting $column[0] later in the script which would cause the element at offset 0 to be remove, hence the array keys starting from 1?

oh, yes. I did. That's the reason? Thanks.

[exeTrix]

yup, that'll be the reason.