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Get array elements like print_r?

Posted on 2010-08-12
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Last Modified: 2012-05-10
How can I iterate over the elements of an array in the same way as the print_r output?

For example, print_r displays the array as:

Array ( [0] => Array ( ) [1] => Array ( [0] => A ) [2] => Array ( [0] => B ) [3] => Array ( [0] => B [1] => A ) [4] => Array ( [0] => C ) [5] => Array ( [0] => C [1] => A ) [6] => Array ( [0] => C [1] => B ) [7] => Array ( [0] => C [1] => B [2] => A ) )

If I use foreach to access each element, there are error messages for each array element for which there are no values:

foreach ($array as $i1 => $n1) {
        foreach ($array as $i2 => $n2){
           
           echo $array[$i1][$i2];
        }  
}

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Question by:pillmill
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4 Comments
 
LVL 2

Accepted Solution

by:
gtagliani earned 500 total points
ID: 33422322
try this:

for ( $i = 0 ; $i < count($array) ; $i++ )
{
      echo "<br>";
      for ( $j = 0 ; $j < count($array[$i]) ; $j++ )
      {
            echo $array[$i][$j] . " - ";
      }

}
0
 
LVL 4

Expert Comment

by:stevepicks
ID: 33422325
Have a look at
http://www.learnphp-tutorial.com/Arrays.cfm
at the bottom of the page, there is a two-dimensional array example
Hope it helps
Cheers
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 33422884
You can use isset() or empty() to test for the existence and content of variables before you use them in other PHP statements.  A good programming practice always!

But having said that, this sequence of code looks confused.

foreach ($array as $i1 => $n1) {
        foreach ($array as $i2 => $n2){
           
           echo $array[$i1][$i2];
        }  
}

I have never seen a design pattern that nested two iterators inside one another - when accessing the same array or object.  If you want to post a code snippet that includes a piece of sample data, I can show you the ways to use the foreach() statements.  I would be glad to use the example you posted above, but it's too much of a nuisance to copy the print_r output and turn it back into an array, so just give us the starting data and I'll show you how print_r would do it.

best, ~Ray
0
 
LVL 4

Expert Comment

by:thor_victor
ID: 33430911
What are you trying to do exacly?

Compare each data value with something?

Or you are trying just to format as print_r?
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