Code Examples -> Tweak Array, insert/add elements to any position of your arrays - delete elements from your arrays - move elements within your arrays - replace elements from your arrays ... the array, 'dynamically' grows or shrinks to whatever we tweak it.

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PHP Code Examples

Title :	Tweak Array, insert/add elements to any position of your arrays - delete elements from your arrays - move elements within your arrays - replace elements from your arrays ... the array, 'dynamically' grows or shrinks to whatever we tweak it.
Categories :	PHP Classes, Arrays, PHP	Holger Bahr
Date :	Feb 16th 2001
Grade :	1 of 5 (graded 3 times)
Viewed :	23667
File :	No file for this code example.
Images :	No Images for this code example.

Search :	More code by Holger Bahr
Action :	Grade This Code Example
Tools :	My Examples List

Code

<?
############################################################
#######
##
## Array tweaker class (would be nice to have something like this hardcoded in
PHP :)
## by Holger Bahr, Waldorf GmbH
##
## ... for unique sounding electronic music gear visit us at:
## http://www.waldorf-music.de
##
## you can use this class if you want to
##
## - delete elements of your arrays
## - insert elements to your arrays
## - move an element of your arrays to another position
## - replace an element of your array
##
## You can delete this stupid header if you use the class
## in your software. When you add some functionality or
## something, please drop me a line to hb@waldorf-gmbh.de
##
############################################################
#######
class tweak_array
{
var $error_l = 'Warning: Check your input parameters in your call to ';
var $error_r = '';

function insert($array = '', $position = '' , $elements= '')
{
if ($position == '' || $array == '' || $elements == '' || $position < 1 || $position > count
($array)+1)
{
echo $this->error_l."insert".$this->error_r;
}
else
{
$left = array_slice ($array, 0, $position-1);
$right = array_slice ($array, $position-1);
$insert = explode ('\,', $elements);
$array = array_merge ($left, $insert, $right);
unset($left, $right, $insert);
}

unset ($position, $elements);
return $array;
}

function delete($array = '', $from = '', $to='')
{
if ($to == '') $to = $from;
if ($array == '' || $from == '' || $to > count($array) || $to < 1 || $from > count($array))
{
echo $this->error_l."delete".$this->error_r;
}
elseif ($to < $from)
{
echo 'Warning: you provided wrong parameter relationship to
delete';
}
else
{
$left = array_slice ($array, 0, $from-1);
$right = array_slice ($array, $to);

$array = array_merge ($left, $right);
unset ($left, $right);
}

unset ($from, $to);
return $array;
}

function move($array = '', $from = '', $to = '')
{
if ($array == ''|| $from == ''|| $to == '' || $to > count($array) || $to < 1 || $from > count
($array) || $from < 1)
{
echo $this->error_l."move".$this->error_r;
}
else
{
$hopper = $array[$from-1];

$array = $this->delete($array, $from);
$array = $this->insert($array, $to, $hopper);
}

unset ($hopper, $from, $to);
return $array;
}

function replace($array = '', $position = '', $new_element = ' ')
{
if ($array == '' || $position == '' || $position > count($array) || $position < 1)
{
echo $this->error_l."replace".$this->error_r;
}
else
{
$array = $this->insert($array, $position, $new_element);
$array = $this->delete($array, $position+count(explode('\,', $new_element)));
}

unset ($position, $new_element);
return $array;
}
}
############################################################
#######################
##
## Never forget the "\," when inserting multiple things into an existing single
## element and use implode() with the same separator "\," when you drop the
## whole content of an other array, into a single element (see Example).
##
## NEVER forget that an array starts with [0] and we say that 0 is the 1ST element.
##
############################################################
#######################
?>

<html>
<body>


<?
// include ("tweak_array.php"); (normally, we have to include/require the class)

############################################################

# we need an array to tweak and an instance of the class
############################################################

$our_array = array('one', '2', '3.646', 'four', '5.023', 'six', 'seven', 'eight', 'nine', 'ten');
$tweak_array = new tweak_array;
############################################################

?>
<table border = "1">
<tr>
<?
echo '<td valign="top">let�s have a look at our array: ';
while (list($key, $value) = each ($our_array))
{
echo "- ".$value." ";
}
echo "</td>";
echo '<td valign="top">now we delete element 4 of that array ';

############################################################

# delete element 4 of the array
############################################################

$our_array = $tweak_array->delete($our_array, 4);
############################################################

while (list($key, $value) = each ($our_array))
{
echo "- ".$value." ";
}
echo "</td>";
echo '<td valign="top">let�s add 2 new elements from on position 2 ';

$newstuff = array('new_ONE', 'new, TWO');
// if we want to insert new arrays (single values), we need to implode them
// using a "\," as delimitor

############################################################
#
# insert an other array�s elements into our "main" array :
############################################################

$our_array = $tweak_array->insert($our_array, 2, implode("\,",$newstuff));
############################################################

while (list($key, $value) = each ($our_array))
{
echo "- ".$value." ";
}
echo "</td>";
echo '<td valign="top">let�s add another 2 new elements from on position 2 ';

// now we add them manually (not inserting an array)
// so we use still a "\," as delimitor, but not on implode

############################################################
#
# insert 2 new elements :
############################################################

$our_array = $tweak_array->insert($our_array, 2, "new,one\,new,two");
############################################################

while (list($key, $value) = each ($our_array))
{
echo "- ".$value." ";
}
echo "</td>";
echo '<td valign="top" nowrap>replace element 6 ';

############################################################
#
# replace an element with new content :
############################################################

$our_array = $tweak_array->replace($our_array, 6, "new_at_SIX");
############################################################

while (list($key, $value) = each ($our_array))
{
echo "- ".$value." ";
}
echo "</td>";
echo '<td valign="top">moving elemt 6 to position 2 ';

############################################################
#
# moving an element :
############################################################

$our_array = $tweak_array->move($our_array, 6, 2);
############################################################

while (list($key, $value) = each ($our_array))
{
echo "- ".$value." ";
}
echo "</td>";
echo '<td valign="top">at last, we delete elements 7 to 13 ';
############################################################
#
# delete multiple elements (works only when they are a line of neighbours) :
############################################################

$our_array = $tweak_array->delete($our_array, 7, 13);
############################################################

while (list($key, $value) = each ($our_array))
{
echo "- ".$value." ";
}
echo "</td>";
// now we unset our class because we�re finished
unset($tweak_array);
?>
</tr>
</table>

 
Our array here shrinks and grows to whatever we tweak it.

For example, when you got an array with 10 elements and you want
 
to remove one of them with unset($my_array[5]);
 
that array does not shrink to 9 elements then. Element 5 is just NULL.
 
Or, try to insert 3 new elements from position 5 (in an 10 elemnts sized array)....
</body>
</html>

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User Comments

Michael Browning wrote :662
This `class`, though useful, is NOT an object oriented implementation of an array. It is an example of using a `class` definition as a namespace. And, if the error variables (which are supporting properties with no real association with an array class) were removed, it could be used in the same way as any static function can be used in a class, without even the need to create an instance of the `class`... The class itself has no intrinsic data defined. It is a package of functions that share no common information and each could stand alone outside the class scope. No one should view this as a `good` example of using classes in PHP... it isn`t. This does NOT belong in the classes/objects section just because it uses `class`... I come here looking for interesting examples of php class utility, not repackaged functions. I`d be curious as to why the author chose to use `class` for this implementation instead of just defining the functions independently. I don`t mean to be harsh. I just think that there needs to be some `truth-in-posting`. There are sooo many code repositories these days that one can`t afford to waste time investigating something that claims to be one thing, and turns out to be the exact opposite. BUT, I wish the author the BEST of luck and hope that the next version of this will truly be a useful class.