Using Arrays in PHP

Sabari · #**101** (**permalink**) 08-28-2007, 08:14 AM

Remove an Other Row of Array

<?
//This is a code remove an other row of array
//$mang is an array, $id is index of row in array
function remove($mang,$id)
{
$flag = false;
$count = count($mang);
$i = 0;
while ($flag!=true && $i<$count) {
if ($i==$id) {
unset($mang[$i]);
$flag = true;
$index = $i;
}
else {
if ($temp) {
array_push($temp,$mang[$i]);
}
else
{
$temp = array($mang[$i]);
}
}
$i++;
}
if ($flag) {
while ($index<$count)
{
if ($temp) {
array_push($temp,$mang[$index+1]);
}
else
{
$temp = array($mang[$index+1]);
}
$index++;
}
}
array_pop($temp);
return $temp;
}

$arr = array(array("id"=>"1","name"=>"b"),array("id"=>"2" ,"name"=>"d"));
array_push($arr,array("id"=>"3","name"=>"f"));
array_push($arr,array("id"=>4,"name"=>"g"));
$arr = remove($arr,2);
echo "<pre>";
print_r($arr);
?>

OutPut:

Array
(
[0] => Array
(
[id] => 1
[name] => b
)

[1] => Array
(
[id] => 2
[name] => d
)

[2] => Array
(
[id] => 4
[name] => g
)

)

Sabari · #**102** (**permalink**) 08-28-2007, 08:19 AM

Multidimensional array in a Simple Mono dimensional Array

<?
function flatten_array($value, $key, &$array)
{
if (!is_array($value))
array_push($array,$value);
else
array_walk($value, 'flatten_array', &$array);

}

$oldarray = array
(
1 => array(1,2),
2 => array(3,4)
);
$newarray = array();
array_walk($oldarray, 'flatten_array', &$newarray);
echo "<pre>";
print_r($oldarray);
print_r($newarray);
echo "</pre>";
?>

OutPut:

Array
(
[1] => Array
(
[0] => 1
[1] => 2
)

[2] => Array
(
[0] => 3
[1] => 4
)

)
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
)

Sabari · #**103** (**permalink**) 08-28-2007, 08:24 AM

if you want to sort arrays like this?

1 --- 2
1 --- 3
1 --- 4
2 --- 3
2 --- 4
3 --- 4

simple just use this below code:
$aInt = array('1','2','3','4');

<?
$aInt = array('1','2','3','4');
$NumInt = count($aInt);
for($j=0; $j<=$NumInt-1; $j++)
{
$first = $aInt[$j];
for ($i=1; $i<=$NumInt-1-$j; $i++)
{
echo $first." --- ".$aInt[$i+$j]."<br>";
}
}
?>

Sabari · #**104** (**permalink**) 08-28-2007, 08:58 AM

Convert Array into Simple XML

<?
function array_xml($array, $num_prefix = "num_")
{
if(!is_array($array)) // text
{
return $array;
}
else
{
foreach($array as $key=>$val) // subnode
{
$key = (is_numeric($key)? $num_prefix.$key : $key);
$return.="<".$key.">".array_xml($val, $num_prefix)."</".$key.">";
}
}

return $return;
}

//example:

$array[0][0] = 1;
$array[0]['test'] = "test";
$array['test1']['test2'] = "test";
$array['test'][0] = "test";
$array['test'][1]['test_x'] = $array;

print_r($array);

print"<xml>";

print array_xml($array);

print"</xml>";
?>

Output:

print_r($array) previev:

Array
(
[0] => Array
(
[0] => 1
[test] => test
)
[test1] => Array
(
[test2] => test
)
[test] => Array
(
[0] => test
[1] => Array
(
[test_x] => Array
(
[0] => Array
(
[0] => 1
[test] => test
)
[test1] => Array
(
[test2] => test
)
[test] => Array
(
[0] => test
)
)
)
)
)

result xml in firefox preview:

<xml>
<num_0>
<num_0>1</num_0>
<test>test</test>
</num_0>
<test1>
<test2>test</test2>
</test1>
<test>
<num_0>test</num_0>
<num_1>
<test_x>
<num_0>
<num_0>1</num_0>
<test>test</test>
</num_0>
<test1>
<test2>test</test2>
</test1>
<test>
<num_0>test</num_0>
</test>
</test_x>
</num_1>
</test>
</xml>

Sabari · #**105** (**permalink**) 08-28-2007, 11:54 PM

To Count Dimensions in Multi-Array

$array = array('index1' => 'val1', 'index2' => 'val2', 'index3' => 'val3');

$vResult = countdim($array);
echo $vResult;

function countdim($array)
{
if (is_array(reset($array)))
$return = countdim(reset($array)) + 1;
else
$return = 1;

return $return;
}

This function will return int number of array dimensions.

Sabari · #**106** (**permalink**) 08-29-2007, 12:31 AM

Types Of Arrays:
There are three different types of arrays in PHP:

a) Numeric Array: An array with a numeric ID key.
b) Associative Array: An array where each ID key is associated with a value.
c) Multidimensional Array: An array containing one or more arrays.

Now lets discuss different types of arrays in details.

Sabari · #**107** (**permalink**) 08-29-2007, 12:32 AM

Numeric Arrays:

Numeric arrays use integer / numbers as their index number to identify each item of the array. The example we discussed above are numeric arrays as they have integer values as index numbers for each item.

<?php
$colours = array("white","black","blue");

print_r($colours);

output will be
Array
(
[0] => white
[1] => black
[2] => blue
)

?>

In the above output you can see the index numbers for white, black and blue are 0,1,2 respectively which are numeric values and hence we call such arrays numeric arrays.

Sabari · #**108** (**permalink**) 08-29-2007, 12:33 AM

Associative Arrays:
Sometimes it’s better to use the index name instead of index number for example if you want to save three students' names and numbers so your best option will be to use each student’s name as index value for the array and his numbers as the values, behold on the example below,

<?php

$students['Anna'] = 90;
$students['Maria'] = 60;
$students['Jennifer'] = 40;

?>
When you submit a form using POST or GET method you get a similar associative array on the receiving page that contains the name of each form field as array index and its value as index value. Try to make a HTML form with some fields and post it and on the receiving page print the global arrays like

print_r($_POST);
print_r($_GET);

and you will see the associative array.

Associative Arrays are more easy to handle and to process information especially dealing with complex form submission and dynamic values from database etc.

Sabari · #**109** (**permalink**) 08-29-2007, 12:34 AM

Multidimensional Arrays:
A multidimensional array can contain arrays within itself and the sub arrays contain more arrays within them.

Let's move to a real world example to understand the concept of multidimensional arrays:

David has two sons Richie and Mason. Richie has two daugters Sue and Natasha while Mason has three daughters Nichole, Salma and Amber.

Now they family tree is as follows:
mutidimensional arrays
If we want to display David’s family tree with a multidimensional array in PHP then we can define an array as below:

$david = array
(
“richie”=>array
(
“Sue”,
“Natasha”
),

“Mason”=>array
(
“Nichole”,
“Salma”,
“Amber”
)

);

This is how you can use multidimensional arrays to organize data. Try to submit an array of form fields and then print the global array to check the output, you will get the global array as multidimensional array that will contain more sub arrays.

Sabari · #**110** (**permalink**) 08-29-2007, 12:44 AM

To anybody wanting a double-sided array_diff - array_diff gives you everything in the first array that isn't in the subsequent arrays.

$array1=array('blue','red','green');
$array2=array('blue','yellow','green');

$Result = array_merge(array_diff($array1, $array2),array_diff($array2, $array1));
print_r($Result);

Result
Array
(
[0] => red
[1] => yellow
)

P.Sathiya · #**111** (**permalink**) 08-29-2007, 05:22 AM

hi senraj,

Quote:

Originally Posted by senraj

What is maximum size of a normal variable & array variable? OR is there any default size available? Pls help me. Thanks

The capacity of the array is limited only by the capacity of the user's machine.

venkat_charya · #**112** (**permalink**) 08-29-2007, 07:19 AM

Hi friends,

Can any body tell me to solve this problem.

I have two array.

$a = array("A","B","C","D");
$b = array("2","3","0","4");

Just want to check if array $b having 0 value then remove that array key and same key removed in $a. So the output should come like that.

A, B, D
2, 3, 4

I hope problem understandable here. I need to solve this without using any loop.

Thanks in advance

raj · #**113** (**permalink**) 08-29-2007, 07:54 AM

Hi Venkat Charya.....

here i given sample code for your query...

<?$a = array("A","B","C","D","E","I","F","G");
$bvalue = array("2","3","0","4","0","3","4","0");
$bKey = array_keys($bvalue);
echo "Input :<br>";
print_r($a);
$aFinal = array_map("funRemove", $bKey, $bvalue);
echo "Result :<br>";
print_r($a);

function funRemove($pmKey, $pmValue)
{
global $a;
if($pmValue == 0) unset($a[$pmKey]);

}

//# Result:

Input :Array
(
[0] => A
[1] => B
[2] => C
[3] => D
[4] => E
[5] => I
[6] => F
[7] => G
)
Result :Array
(
[0] => A
[1] => B
[3] => D
[5] => I
[6] => F
)

?>

venkat_charya · #**114** (**permalink**) 08-29-2007, 08:27 AM

Thanks Raj it is working absolutely fine. As per my search if there is only single value for which we want to remove we can use this code.

<?php
$input = array("red", "green", "blue", "yellow");
$vKey = array_search("green",$input);
unset($input[$vKey]);
print_r($input);
?>

But repeatition of same value, which we want to remove we can use your code which will work either condition [Single or multiple]. Your sample code giving perfect solution.

Thanks once again for your fast reply

Sabari · #**115** (**permalink**) 09-18-2007, 09:44 AM

Thanks for you questions Mr. venkat_charya, we hope, all of your questions are mostly satisfied with our answers, we also leared lot of things while try to answer your queries, we are eagerly waiting for your more questions, please keep on posting....

senraj · #**116** (**permalink**) 10-17-2007, 11:11 PM

hi,

array 1 match up to the correct values in array 2

array 1 array 2
1 4
2 1
3 3
4 5
5 2

<?php
$a1 = array(1, 2, 3, 4, 5);
$a2 = array(4, 1, 3, 5, 2);

var_dump(! (bool) array_diff($a1, $a2));
?>

Will print true if both arrays have the same values.

senraj · #**117** (**permalink**) 10-27-2007, 12:14 AM

hi,

How to reverse a array in php?

$my_array = array("a" => "Dog", "b" => "Cat", "c" => "Horse");

krsort($my_array);
echo "<pre>";
print_r($my_array);
echo"</pre>";

output:
-------

Array
(
[c] => Horse
[b] => Cat
[a] => Dog
)

senraj · #**118** (**permalink**) 10-27-2007, 12:26 AM

hi,

previous post reverse an array in php with using built in function and example.

now, am asking question for...

How to reverse an array in php with out using any built in functions?

senraj · #**119** (**permalink**) 10-29-2007, 05:50 AM

$friend = array("Justin","Lloyd","Alexa","Devron");
$age = array(45,32,26,"Sen => 24");

$res = array_merge($friend,$age);
echo implode(",",$res);

echo "</br>";

$res1 = array_merge_recursive($friend,$age);
echo implode(",",$res1);

output:
---------
Justin,Lloyd,Alexa,Devron,45,32,26,Sen => 24

Justin,Lloyd,Alexa,Devron,45,32,26,Sen => 24

What is difference between array_merge and array_merge_recursive ?

Sabari · #**120** (**permalink**) 11-02-2007, 03:59 AM

Difference for these two functions

array_merge()
===========

It merges the elements of one or more arrays. The elements and values are appended at the end of the previous array.

array_merge_recursive:
=================
It merges the two or more arrays recurssively.

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