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Full Discussion: Comparing Variables in Perl
Top Forums Shell Programming and Scripting Comparing Variables in Perl Post 302237927 by KevinADC on Thursday 18th of September 2008 04:45:51 PM
Old 09-18-2008
Quote:
Originally Posted by avronius
Can you explain the comparison that you are looking for?
Is it one to one:
Code:
if ($a[0] = $b[0])
{
   your code here
}

Is it one to many:
Code:
for (@a){
   if ($b[0] = $_)
   {
      your code here
   }
}

Or is it many to many, in which case a database is much more efficient....
None of your example compare anything, "=" is the assignment operator.

To compare numbers use "==" to compare strings use "eq", of course sometimes its never that simple but it looks like it would be in this case if the examples are what is really being compared. There are also modules that compare arrays, one I believe is called Array::Compare
 

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LEARN ABOUT PHP

array_diff

ARRAY_DIFF(3)								 1							     ARRAY_DIFF(3)

array_diff - Computes the difference of arrays

SYNOPSIS

       array array_diff (array	$array1, array	$array2, [array  $...])

DESCRIPTION

	Compares $array1 against one or more other arrays and returns the values in $array1 that are not present in any of the other arrays.

PARAMETERS

	      o $array1
		- The array to compare from

	      o $array2
		- An array to compare against

	      o $...
		- More arrays to compare against

RETURN VALUES

	Returns an array containing all the entries from $array1 that are not present in any of the other arrays.

EXAMPLES

       Example #1

	      array_diff(3) example

	      <?php
	      $array1 = array("a" => "green", "red", "blue", "red");
	      $array2 = array("b" => "green", "yellow", "red");
	      $result = array_diff($array1, $array2);

	      print_r($result);
	      ?>

	       Multiple occurrences in $array1 are all treated the same way. This will output :

	      Array
	      (
		  [1] => blue
	      )

NOTES

       Note

	       Two  elements  are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is
	      the same.

       Note

	       This function only checks  one  dimension  of  a  n-dimensional	array.	Of  course  you  can  check  deeper  dimensions  by  using
	      array_diff($array1[0], $array2[0]);.

SEE ALSO

       array_diff_assoc(3), array_intersect(3), array_intersect_assoc(3).

PHP Documentation Group 													     ARRAY_DIFF(3)
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