PHP Arrays

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What is an arrays in PHP ?

An array is a data structure set of elements that store multiple values in a single variable on the pair basis of key/value

An array is a compound types data type, it is hold more than one value at a time

$name1 ='Vishal Gupta';
$name2 ='Vipin Katiyar';
$name3 ='Harshendra';

Supposed you have 1000 names then it is not good solution to create 1000 variables, we have to create an array

$name =array('name1'=>'Vishal Gupta','name2'=>'Vipin Katiyar','name3' =>'Harshendra');
echo $name['name1'];
//output : Vishal Gupta

Create an Array in PHP

array() function to used create an array

array();

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Types of Arrays in PHP ?

There are three types of arrays in PHP. These are:

• Indexed array - Array with neumric key
• Associative array - Array with named keys means array with key and it's specific value
• Multidimensional array - An array conatining one more array

Indexed or numeric array

In Indexed array each elements with a numric key

//Indexed array syntax
//Indexed assigned automatically
$lang = array('PHP','Java','C#');

or:

 	
//Indexed assigned manually
$lang[0]='PHP';
$lang[1]='Java';
$lang[2]='C#';

Associative array

Associative arrays is like indexed array, but Index can be of any data type. data stored at key,value pair.

//Associative array syntax
$user_qualification = array("Vishal"=>'MCA','Vipin'=>'B.tech','Harsh'=>'MBA');

or:

 	
$user_qualification['Vishal']='MCA';
$user_qualification['Vipin']='B.tech';
$user_qualification['Harsh']='MBA';

Multidimensional array

In Multidimensional array is an array of arrays, in which each element can be also an array. Example : 2D,3D (an array of arrays of arrays.), etc

//Multidimensional array syntax
$users = array(
array('name'=>'Pradeep','email'=>'abc@example.com'),
array('name'=>'Rahul','email'=>'xyd@example.com')
);

echo $users[0]['name'];
//Output :: Pradeep

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How to get the length of array in PHP ?

You get the length of the array by using count()

$users = array(
array('name'=>'Pradeep','email'=>'abc@example.com'),
array('name'=>'Rahul','email'=>'xyd@example.com')
);

echo count($users); //2
echo count($users,1); //6

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Array viewing data

By using print_r() or var_dump() view the array elements.

$users = array(
array('name'=>'Pradeep','email'=>'abc@example.com'),
array('name'=>'Rahul','email'=>'xyd@example.com')
);

print_r() for view the array data

Array ( [0] => Array ( [name] => Pradeep [email] => abc@example.com ) [1] => Array ( [name] => Rahul [email] => xyd@example.com ) )

var_dump() for view the array data

array (size=2)
  0 => 
    array (size=2)
      'name' => string 'Pradeep' (length=7)
      'email' => string 'abc@example.com' (length=15)
  1 => 
    array (size=2)
      'name' => string 'Rahul' (length=5)
      'email' => string 'xyd@example.com' (length=15)