[PHP-DOC] #21728 [Opn]: Additional (kindly weird example) for sort() From: philip <email protected>
Date: 01/18/03

 ID: 21728
 Updated by: philip <email protected>
 Reported By: andrey <email protected>
 Status: Open
 Bug Type: Documentation problem
 Operating System: All
-PHP Version: 4.3.0
+PHP Version: 4.4.0-dev
 New Comment:

How about:

<?php
$arr1 = array("a","b","4",5,4,"true","TRUE",true, false, "c");
sort($arr1);
var_dump($arr1);
?>

Which gives:
array(10) {
  [0]=>
  bool(false)
  [1]=>
  string(4) "TRUE"
  [2]=>
  string(1) "a"
  [3]=>
  string(4) "true"
  [4]=>
  bool(true)
  [5]=>
  string(1) "b"
  [6]=>
  string(1) "c"
  [7]=>
  int(4)
  [8]=>
  string(1) "4"
  [9]=>
  int(5)
}

Which is weird as "4" looks misplaced. For example in this:
<?php
$arr1 = array("a","b","4",5,4,"true","TRUE",true, false, "c", "d");
sort($arr1);
var_dump($arr1);
?>

We get different results (all I added was "d" to the end):

array(11) {
  [0]=>
  bool(false)
  [1]=>
  string(1) "4"
  [2]=>
  string(4) "TRUE"
  [3]=>
  string(1) "a"
  [4]=>
  string(1) "b"
  [5]=>
  string(1) "c"
  [6]=>
  string(1) "d"
  [7]=>
  string(4) "true"
  [8]=>
  bool(true)
  [9]=>
  int(4)
  [10]=>
  int(5)
}

Notice the different order, is this a genuine bug?

Previous Comments:
------------------------------------------------------------------------

[2003-01-18 10:26:27] andrey <email protected>

 Today I closed bug #21444. The user has to master the type juggling to
know the expected output. I think that it is good idea to add it's
example as comprehensive one.
The script goes here (the explanation is after it) :
<?php
$arr1 = array("a","b","c","d","4",5,4,"true","TRUE",true);
sort($arr1);
var_dump($arr1);
?>

The output is :
array(10) {
  [0]=>
  bool(true)
  [1]=>
  int(4)
  [2]=>
  string(1) "4"
  [3]=>
  string(4) "TRUE"
  [4]=>
  string(1) "a"
  [5]=>
  string(1) "b"
  [6]=>
  string(1) "c"
  [7]=>
  string(1) "d"
  [8]=>
  string(4) "true"
  [9]=>
  int(5)
}
It may look strange - why (int)5 is after all the strings. This is
because "4" is lower than (int) 5, "4" is before "true" and "true" is
before 5. The first 2 are obvious, the third one is not. But it is ok.
It's better not to mix types in the array. If 5 is changed to "5" then
"5" goes right after "4".

Thanks

------------------------------------------------------------------------ 

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