Php array

 An array is assigned to a single variable, but it
can hold dozens of individual pieces of
information.
 Each individual bit of information, or row, is
referred to as an array element.
 Within every array element there are two parts:
the value, which contains the actual
information you want to store, and a unique
key which identifies the value.
 you will learn later how key palys an
importanat role in the process of accessing
and manipulating array elements.
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 Keys can either be non-negative integers or
strings.
 Array with integers as key are the most
common type and known as SCALAR ARRAYs.
 Those with key as string are known as
ASSOCIATIVE ARRAY.
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 There are 2 kinds of arrays in php: indexed
and associative arrray.
 Key of indexed array is integer starts with 0.
 Indexed array are used when we identify
things with their position.
 Associative arrays have strings as keys and
behave more like two-columns table.
 The first column is key and second is use to
access value.
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 Numeric array
 Associative Array
 Multidimensional Array.
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 In numeric array have to create only
elements, id will be automatically assigned to
the elements.
example
<?php
$a = array("train", "car","bus");
print_r($a);
?>
output
 Array ( [0] => train [1] => car [2] => bus )
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 In associative array we have create element
with id.
 example
 <?php
 $a =
array("6"=>"train","7"=>"car","8"=>"bus");
 print_r($a);
 ?>
 Out put.
 Array ( [6] => train [7] => car [8] => bus )
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 Multidimensioanl array means we have to create
array within array.
 example
 <?php
 $a = array("a","b"=>array("train","car"),"bus");
 print_r($a);
 ?>
 Out put.
 Array ( [0] => a [b] => Array ( [0] => train [1] =>
car ) [1] => bus )
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 Create an array by using the elements from
one "keys" array and one "values" array:
 <?php
$fname=array("Peter","Ben","Joe");
$age=array("35","37","43");
$c=array_combine($fname,$age);
print_r($c);
?>
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 This function is for counting the values of an
array.
 <?php
 $no=array(0=>"5",1=>"10",2=>"15",3=>"15
");
 print_r(array_count_values($no));
 ?>
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 Compare the values of two arrays, and return the
differences(difference value is displayes of first
array.)
 <?php
 $animal1=array("a"=>"lion","b"=>"tiger");
 $animal2=array("c"=>"dog","b"=>"tiger");
 $animal3=array("a"=>"cow","g"=>"tiger");
 print_r(array_diff($animal1,$animal3));
 ?>
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 Merge two arrays into one array:
 <?php
 $animal2=array("c"=>"dog","d"=>"tiger");
 print_r(array_merge($animal1,$animal2,$animal3
));
 ?>
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 Merge two arrays into one array:
 <?php
 print_r(array_merge_recursive($animal1,$animal2
,$animal3));
 ?>
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 Returns an array in the reverse order
 <?php
 print_r(array_reverse($animal1));
 ?>
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 Searches an array for a given value and returns
the key
 <?php
 print_r(array_search("lion"$animal1));
 ?>
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 The array_sum() function returns the sum of
all the values in the array.
 <?php
$a=array(5,15,25);
echo array_sum($a);
?>
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 This function sorts an associative array in desending
order, according to the value.
 <?php
 $animal1=array("a"=>"lion","b"=>"tiger","c"=>"dog","d
"=>"tiger");
 arsort($animal1);
 foreach ($animal1 as $key =>$val)
 {
 echo "$key = $val"."<br>";
 }
 ?>
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 This function sorts an associative array in ascending order,
according to the value
 <?php
 $animal1=array("a"=>"lion","b"=>"tiger","c"=>"dog","d"=
>"tiger");
 asort($animal1);
 {
 }
 ?>
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 This function sorts an associative array in desending order,
according to the key.
 <?php
 $animal1=array("a"=>"lion","b"=>"tiger","c"=>"dog","d"=>"tiger
");
 arsort($animal1);
 {
 }
 ?>
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 This function sorts an associative array in ascending order,
according to the key
 <?php
>"tiger");
 {
 }
 ?>
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 This function is to find out no. of elements in an
array.
 <?php
 $animal1=array("a"=>"lion","b"=>"tiger","c"=>"d
og","d"=>"tiger");
 print_r(sizeof($animal1));
 ?>
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 Removes the first element from an array and returns the
value of the removed element.
 <?php
>"tiger");
 echo array_shift($animal1);
 echo "<br>";
 print_r($animal1);

 ?>
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 Return an array of random keys:
 <?php
 $input=array("a","b","c","d","e","f","g","h",);
 $rand_keys = array_rand($input,2);
 echo $input[$rand_keys[0]]."n";
 echo $input[$rand_keys[1]]."n";
 ?>
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 array_push() function inserts one or more
elements to the end of an array.
 You can add one value, or as many as you
like.
 Even if your array has string keys, your added
elements will always have numeric keys.
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 <?php
 $a=array("a"=>"tree",'b'=>"car");
 array_push($a,"bike","activa");
 print_r($a);
 ?>
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 array_pop() function deletes the last element
of an array.
 <?php
 $a=array("tree","car","bike");
 array_pop($a);
 print_r($a);
 ?>
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Php array

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