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Array Concept in PHP:- 

It is a collection of elements of the similar and dissimilar datatype, We can store element dynamically without providing size in PHP array.
base index of the array will 0 to size-1, for example, the array has five elements then the array index will be started from 0 to 4.

Advantage of Array:-

1)  We can store multiple elements using a single variable which is easy for program code.


2)  We can easily search and sort the elements  



Type of Array:- 


 1)  Index Array:-  it will store data using an index where the base index will be started from 0 to size-1.


$arrayname = array(12,23,34,11,56,67,78);

$arrayname = array("c",12,23.45,"hello");


$arrayname[0]=12


....


Example of Array:-


<?php
$arr = array(12,23,34,11,67,78);

for($i=0;$i<count($arr);$i++)
{
    echo $arr[$i],"<br>";
}



?>


Example of Array using Foreach Loop:-

<?php

$arr = array("C",1200,"CPP",3450,"DS",56700,79800,"welcome");

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

foreach ($arr as $arr1) {
echo $arr1,"<br>";
}

?>




Program To reverse array element in PHP?

<?php
$arr = array(12,23,34,11,67,78,88,98);

for($i=count($arr)-1;$i>=0;$i--)
{
    echo $arr[$i],"<br>";
}



?>


Program to calculate the sum of array elements in PHP?

<?php
$arr = array(12,23,34,11,67,78,88,98);

$s=0;
for($i=0;$i<count($arr);$i++)
{
    $s=$s+$arr[$i];
}
echo $s;

?>

 2)   Associative Array:-

 Using this we can store elements using key=>value pair where the key is used to provide identity and value is used to provide data.


for example, rno=>1001 here rno is key and 1001 is values.

$stu = array("rno"=>1001,"sname"=>"manish kumar","branch"=>"CS","fees"=>45000);


here rno,sname,branch and fees are the keys (=> association)  

Example of Associative Array:-

<?php

$stu = array("rno"=>1001,"sname"=>"manish kumar","branch"=>"CS","fees"=>45000);

foreach($stu as $key=>$value)
{
    echo "$key  is $value"."<br>";
}   





?>

.....................................................................................
Q1)  WAP to find max, second max element in an array?

<?php
$arr = array(12,20,23,11,21,17);
$max = $arr[0];
$smax= $arr[0];
for($i=1;$i<count($arr);$i++)
{
   if($max<$arr[$i]) //12>20
   {
  $smax=$max;
    $max= $arr[$i];
   }
   else if($smax<$arr[$i] && $smax!=$max)
   {
    $smax=$arr[$i];
   }

}
echo $max,"<br>",$smax;



?>

Q2)  WAP to sort the elements of the array in asc order?

Q3) WAP to calculate the sum of even and the odd number of elements?


3)  Mixed Array:-

  it is used to collect the similar and dissimilar types of elements using index and associative array.


$x = array(10,11,"rno"=>1001,"name"=>"manish kumar");


we can print mixed array using foreach loop.


Example of Mixed array in PHP:-

<?php

$arr = array(12,23,"rno"=>1001,"CPP","JAVA","fees"=>45000,true,12.345);

foreach ($arr as $key => $value) {
echo "key is $key and value is $value"."<br>";
}


?>




The PRedefine function of the array in PHP:-

print_r():-  It will display the structure of array elements

$arr = array(12,23,"hello","hi")

print_r($arr);



max():-   It will display maximum element in the numerical array.

$arr = array(12,23,34,45.67)

max($arr);

min():-   It will display minimum element in the numerical array.

$arr = array(12,23,34,45.67)

min($arr);


array_sum():-  It will display sum of array elements into a numeric array

$arr = array(12,23,34,45.67)

array_sum($arr)


sort():-  it will sort array elements in ascending order

$arr = array(12,23,34,45.67,2,3)

sort($arr)

print_r($arr)


in_array():-  it will check that element is exist in an array or not.it return a boolean value.

$arr = array(12,23,34,45.67,2,3)

if(in_array(12,$x))
{

 echo "found";
}
else
{
   echo "not found";
}



is_array():-  It will check that variable is normal or array type.

$x=10;

if(is_array($x))
{
    echo "array";

}
else
{
  echo "not array";

}


array_merge():-  it is used to merge two arrays in one array.

$a = array(10,11,12);

$b = array(45,67,89,10);

$c = array_merge($a,$b);

print_r($c);


array_intersect():-   It will display common elements in two array.

$a = array(10,11,12);

$b = array(45,67,89,10);

$c = array_intersect($a,$b);

print_r($c);


array_diff():-  It will display the first array element which not exist on second.

$a = array(10,11,12);

$b = array(45,67,89,10);

$c = array_diff($a,$b);

print_r($c);



array_unique():-  It will display unique elements only and repeated elements display once.


$d = array(2,3,4,2,7,9,11,90,3,4,4,4,5);

$d1 = array_uniqe($d);

print_r($d1);


array_splice():-  It is used to split array elements using an index.

$e = array_splice($d, 6);

print_r($e);


array_chunk():-   It is used to divide one dimension array to a multidimensional array. we will provide number of elements on each row.

$d = array(2,3,4,2,7,9,11,90,3,4,4,4,5);
$e1 = array_chunk($d, 6);

print_r($e1);


array_combine():-  It is used to convert index array to associative array but both arrays should be equal size.

$key = array("rno","sname");

$val = array(1001,"xyz");

$data = array_combine($key,$val);

print_r($data);



A complete example of array predefine functions in PHP:-

<?php

$x = array(12,23,34,11,67,78);
print_r($x);

echo max($x)."<br>";
echo min($x)."<br>";
echo array_sum($x)."<br>";
sort($x);
foreach($x as $y)
{
 echo $y."<br>";
}

if(in_array(121,$x))
{

 echo "found";
}
else
{
   echo "not found";
}

$x=array();

if(is_array($x))
{
    echo "array";

}
else
{
  echo "not array";

}

$a = array(10,11,12);

$b = array(45,67,89,10);

$c = array_merge($a,$b);

print_r($c);

$a = array(10,11,12);

$b = array(45,67,89,10);

$c = array_intersect($a,$b);

print_r($c);
$a = array(10,11,12);

$b = array(45,67,89,10);

$c = array_diff($a,$b);

print_r($c);

$d = array(2,3,4,2,7,9,11,90,3,4,4,4,5);

$d1 = array_unique($d);

print_r($d1);

$e = array_splice($d, 6);

print_r($e);
echo "<br>";
$d = array(2,3,4,2,7,9,11,90,3,4,4,4,5);
$e1 = array_chunk($d, 6);

print_r($e1);

$key = array("rno","sname");

$val = array(1001,"xyz");

$data = array_combine($key,$val);

print_r($data);




?>


ASSIGNMENT:-

Create a complete mark sheet program using array?

The solution to this program:-

<?php

$marks=array("phy"=>45,"chem"=>75,"maths"=>89,"eng"=>77,"hin"=>55);

$count=0;

$total=0;

foreach ($marks as $key => $value) {

if($value<33)
{
$count++;
}
else
{
$total=$total+$value;
}

}

if($count==0)
{
$per=$total/5;
if($per>=33 && $per<45)
    echo "Pass with third division";
    else if($per<60)
    echo "Pass with second division";
    else
    echo "Pass with first division";
    
    
}
else if($count==1)
{
    echo "SUPPL";
}
else
{
   echo "Failed";
}





?>

WAP to display only unique elements in an array?

example   2,2,3,4,5,6,7,5   o/p   3 4 6 7

WAP to display repeated elements in array only once?

example  2,2,3,4,5,6,7,5   o/p   2 5

WAP to merge three arrays in one array?

WAP to sort only prime elements in an array?


WAP to find second max prime elements in the array?

















14 Comments

If you have any doubt in programming or join online classes then you can contact us by comment .

  1. "banana", 2, "monkey", 3);
    $array2 = array("a", "b", "fruit" => "apple", "city" => "paris", 4, "c");
    $array3 = array("a","d","priya" => "paliwal",6,"p");

    // Merging arrays together
    $result = array_merge($array1, $array2, $array3);
    print_r($result);
    ?>

    ReplyDelete
  2. This comment has been removed by the author.

    ReplyDelete
  3. kritika Barod

    $a=array(2,2,3,4,5,6,7,5);

    print_r(array_unique($a));

    ReplyDelete
  4. Kritika Barod

    $a=array(1,2,3,4,5);
    $b=array('f','g','h','i','j');
    $c=array(11,12,13,14,15);
    $m = array_merge($a,$b,$c);
    print_r($m);

    ReplyDelete
  5. Kritika Barod

    $input= array(2,2,3,4,5,6,7,5);
    $result=array_unique($input);
    print_r($result);

    ReplyDelete
  6. function occurredOnce(&$arr, $n)
    {

    sort($arr);


    if ($arr[0] != $arr[1])
    echo $arr[0]." ";


    for ($i = 1; $i < $n - 1; $i++)
    if ($arr[$i] != $arr[$i + 1] &&
    $arr[$i] != $arr[$i - 1])
    echo $arr[$i]." ";


    if ($arr[$n - 2] != $arr[$n - 1])
    echo $arr[$n - 1]." ";
    }

    $arr = array(2,2,3,4,5,6,7,5);
    $n = sizeof($arr);
    occurredOnce($arr, $n);

    ReplyDelete
  7. Shubham Nandwal

    SUM OF ONLY EVEN NUMBERS
    $ar=array(120,5,2,4,4,10,5,56,20);
    $sum=0;
    for($i=0;$i<count($ar);$i++)
    {
    if($ar[$i]%2==0)
    {
    $sum=$sum+$ar[$i];
    }

    }
    echo "SUM OF ONLY EVEN NUMBER IS $sum";

    ReplyDelete
  8. SUM OF EVEN AND ODD NUMBERS
    Shubham Nandwal
    $a=array(1,20,42,4,5,7,22);
    $n=0;

    for($i=0;$i<count($a);$i++)
    {

    $n=$n+$a[$i];
    }

    echo " SUM OF EVEN ODD NUMBER IS $n ";

    ReplyDelete
  9. Sort Elements In Ascending Order
    Shubham Nandwal
    $ar=array(32,14.5,64,1,78);

    sort($ar);

    print_r($ar);

    ReplyDelete
  10. No Repetition,Print Only Unique Elements
    Shubham Nandwal
    $ar=array("a"=>10,"b"=>2,"c"=>30,"d"=>10,"e"=>2,"f"=>4,"g"=>"black","i"=>"black");

    print_r(array_unique($ar));

    ReplyDelete
  11. Shubham Nandwal
    Merge Three Arrays In One Array

    $ar1=array(1,2,3,4,5);
    $ar2=array("a","b","c","d");
    $ar3=array("name"=>"tina","roll no"=>8845,"class"=>"11th");

    print_r($ar=array_merge($ar1,$ar2,$ar3));

    ReplyDelete

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