Thursday 7 August 2014

PHP Array Functions

Array

Function
What it Does
print_r()
Print the value and index of an array(in assciative form)
<?php
            str=array("welcome","student");
            print_r($str);
 ?>
           


 Output : Array([0]=>"welcome",[1]=>"student")
explode()
Splits a string into array elements
<?php
            $str="welcome user how r you";
            //print_r($str);
           
            $arr=explode(" ",$str);
            print_r($arr);
           
           
            //explode
            $val="10,20,30,40,50,60";
            $arr1=explode(",",$val);
            foreach($arr1 as $v)
            {
                        @$s+=$v;
            }
            echo $s;
 ?>
           


 Output : Array([0]=>"welcome",[1]=>"student")
implode()
Joins array elements into a string
<?php
            $arr=array("hello","user");

            $str=implode(" ",$arr);
            echo $str;
 ?>
           


 Output : hello user
count()
Returns an integer value indicating how many elements an array contains
<?php
            $arr=array(10,20,30,40,50);
            echo "Number of elements= ".count($arr)."<br/>";
           

            //use inside for loop to check condition
            for($i=0;$i<count($arr);$i++)
            {
                        @$sum=$sum+$i;
            }
            echo "sum=".$sum;
 ?>
           


 Output : Number of elements=5
                sum=150
           
range()
Generates a number range as an array
<?php
            $range=range("A","M");
            print_r($range);
 ?>
           


 Output : Array ( [0] => A [1] => B [2] => C
     [3] => D [4] => E [5] => F [6] => G [7] => H
     [8] => I [9] => J [10] => K [11] => L [12] => M )
           
max()
Finds the largest value in an array
<?php
            $max=array(10,20,30,40,100,50);
            echo max($max);
 ?>
           


 Output : 100
           
min()
Finds the smallest value in an array
<?php
            $max=array(10,20,30,40,100,50);
            echo min($max);
 ?>
           


 Output : 10
           
shuffle()
Randomly rearranges the sequence of elements in an array
<?php
            $arr=range("a","z");
            shuffle($arr);
            print_r($arr);
 ?>
           


 Output : Refresh page, on every refresh it rearrange
               the index of array.
Array ( [0] => g [1] => a [2] => c [3] => d [4] => b [5] =>
            k [6] => i [7] => l [8] => f [9] => j [10] =>
            e [11] => m [12] => h )
           
array_rand()
Finds the random index of an array
<?php
            $arr=range("a","z");
            $rand=array_rand($arr);
            echo $rand;
 ?>
           


 Output : Refresh page, on every refresh it shows
              an random index b/w a to z.

           
array_slice()
Extracts a segment of an array
<?php
            $color=array("blue","red","green","pink");
            $slice=array_slice($color,1,2);
            print_r($slice);
 ?>
           


 Output : Array ( [0] => red [1] => green )

           
array_shift()
Removes an element from the beginning of an array
<?php
            $city=array("delhi","patna","noida");
            array_shift($city);
            print_r($city);
 ?>
           


 Output : Array ( [0] => patna [1] => noida )

           
array_unshift()
Adds an element to the beginning of an array
<?php
            $city=array("delhi","patna","noida");
            array_unshift($city,"banglore");
            print_r($city);
 ?>
           


 Output : Array ( [0] => banglore [1] => delhi
                        [2] => patna [3] => noida )

           
array_pop()
Removes an element from the end of an array
<?php
            $city=array("delhi","patna","noida");
            array_pop($city);
            print_r($city);
 ?>
           


 Output : Array ( [0] => delhi [1] => patna )

           
array_push()
Adds an element to the end of an array
<?php
            $city=array("delhi","patna","noida");
            array_push($city,"gurgaon");
            print_r($city);
 ?>
           


 Output : Array ( [0] => delhi [1] => patna
               [2] => noida [3] => gurgaon )

           
array_unique()
Removes duplicate elements from an array
<?php
    $city=array("delhi","patna","noida","delhi","patna");
    $uni=array_unique($city);
    print_r($uni);
 ?>
           


Output : Array ( [0] => delhi [1] => patna [2] => noida )

           
array_reverse()
Reverses the sequence of elements in an array
<?php
    $city=array("delhi","patna","noida");
    $rev=array_reverse($city);
    print_r($rev);
 ?>
           


Output : Array ( [0] => noida [1] => patna [2] => delhi )
           
array_merge()
Combines two or more arrays
<?php
    $city=array("delhi","patna");
            $city1=array("gurgaon","banglore");
    $merg=array_merge($city,$city);
    print_r($merg);
 ?>
           


Output : Array ( [0] => delhi [1] => patna [2] =>
               gurgaon [3] => banglore)
           
array_intersect()
Calculates the common elements between two or more arrays
<?php
    $arr1=array("red","blue","pink");
            $arr2=array("black","blue","white");

            $common=array_intersect($arr1,$arr2);
            print_r($common);
 ?>
           


Output : Array ( [1] => blue )
           
array_diff()
Calculates the difference between two arrays
<?php
    $arr1=array("red","blue","pink");
            $arr2=array("black","blue","white");
           
            $diff=array_diff($arr2,$arr1);
            print_r($diff);
 ?>
           


Output : Array ( [0] => black [2] => white )
           
in_array()
Checks if a particular value exists in an array
<?php
    $arr1=array("red","blue","pink");
            echo in_array("red",$arr1);
 ?>
           


Output : 1
           
array_key_exists()
Checks if a particular key exists in an array
<?php
    $arr1=array("red","blue","pink");
            echo array_key_exists(1,$arr1);
 ?>
           


Output : 1
           
sort()
Sorts an array
<?php
    $arr=array(100,11,5,12,150,0);
            sort($arr);
            print_r($arr);
 ?>
           


Output : Array ( [0] => 0 [1] => 5 [2] => 11
              [3] => 12 [4] => 100 [5] => 150 )
           
rsort()
Reverse Sorts an array
<?php
    $arr=array(100,11,5,12,150,0);
            rsort($arr);
            print_r($arr);
 ?>
           


Output : Array ( [0] => 150 [1] => 100 [2] => 12
               [3] => 11 [4] => 5 [5] => 0 )
           
asort()
Sorts an associative array by value
<?php
    $col=array("a"=>"red","z"=>"blue","y"=>"green");
            asort($col);
            print_r($col);
 ?>
           


Output : Array ( [z] => blue [y] => green [a] => red )
           
arsort()
Reverse-Sorts an associative array by value
<?php
    $col=array("a"=>"red","z"=>"blue","y"=>"green");
            arsort($col);
            print_r($col);
 ?>
           


Output : Array ( [a] => red [y] => green [z] => blue )
           
ksort()
Sorts an associative array by key(index)
<?php
    $col=array("a"=>"red","z"=>"blue","y"=>"green");
            ksort($col);
            print_r($col);
 ?>
           


Output : Array ( [a] => red [y] => green [z] => blue )
           
krsort()
Reverse-Sorts an associative array by key(index)
<?php
    $col=array("a"=>"red","z"=>"blue","y"=>"green");
            krsort($col);
            print_r($col);
 ?>
           


Output : Array ( [z] => blue [y] => green [a] => red )
           
array_product()
Calculates the product of an array.
<?php
    $a=array(5,5,5,4);
            echo(array_product($a));
 ?>
           


Output : 500
array_sum()
Calculates the sum of an array.
<?php
    $a=array(0=>5,1=>15,2=>25,15);
            echo array_sum($a);
 ?>
           


Output : 60
array_search()
Search an array for a value and returns the key
<?php
    $a=array("a"=>"Dog","b"=>"Cat","c"=>"Horse");
            echo array_search("Horse",$a);
 ?>
           


Output : c
array_splice()
Removes selected elements from an array and replaces it with new elements.It also returns an array with the removed elements.
<?php
    $a1=array(0=>"Dog",1=>"Cat",2=>"Horse",3=>"Bird");
            $a2=array(0=>"Tiger",1=>"Lion");
            print_r(array_splice($a1,0,2,$a2));

 ?>
           


Output : Array ( [0] => Dog [1] => Cat )

current()
Returns the value of the current element in an array.It returns FALSE on empty elements or elements with no value
<?php
    $arr=array("dog","cat","horse");
            echo current($arr);
 ?>
           


Output : dog

key()
Fetch a key from an array
<?php
    $array = array(
   'fruit1' => 'apple',
   'fruit2' => 'orange',
   'fruit3' => 'grape',
   'fruit4' => 'apple',
   'fruit5' => 'apple');
            while ($fruit_name = current($array))
            {
                        if ($fruit_name == 'apple')
                        {
                                    echo key($array).'
';
                        }
                        next($array);
            }
 ?>
           


Output : fruit1
               fruit4
               fruit5




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