PHP ARRAYS - PHP LESSON 13 STUDENTSBLOG100

Arrays in php are used to hold one or more values in a single variable. These values can be retrieved by its key value.That is, consider we have stored five values in an array. ex)array[a,b,c,d,e]. first value a's address is array[0], second value b's address is array[1], and so on. In associative array method, we can access array contents by named key to

Php Array Types:
There are three types in php arrays, they are

• Indexed arrays - Arrays with index
• Associative arrays - Arrays with keys
• Multidimensional arrays - Nested arrays

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PHP Indexed Array:

This type of array can store numbers, string and objects too. But the index values will be in numeric format starting from zero.

Syntax:
Two ways to implement php indexed array are..

$arrayname=array("Value1","Value2","Value3"); or $arrayname[0]="Value1"; $arrayname[1]="Value2"; $arrayname[2]="Value3";

Example:
<?php $stud_names=array("Student1","Student2","Student3"); echo "Students are " .$stud_names[0]."<br>".$stud_names[1]."<br>".$stud_names[2]; ?>

Output:

Students are Student1
Student2
Student3

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PHP Associative Array:
Associative array will have their index as string. And it has all the functionalities of indexed array.

Syntax:
Two ways to implement php associative array are..
$arrayname = array("Value1"=>"10","Value2"=>"20","Value3"=>"30"); or $arrayname['Value1']="10"; $arrayname['Value2']="20"; $arrayname['Value3']="30";
Example:
<?php $stud_age['Student1']="25"; $stud_age['Student2']="28"; $stud_age['Student3']="37"; echo "Student1 is " . $stud_age['Student1'] . " years old<br>"; echo "Student2 is " . $stud_age['Student2'] . " years old<br>"; echo "Student3 is " . $stud_age['Student3'] . " years old<br>"; ?>
Output:

Student1 is 25 years old
Student2 is 28 years old
Student3 is 37 years old

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PHP Multidimensional Array:

An array inside an array is called as Multidimensional array. The fist value of first inner array can be accessed by $array [0][0] , second value by $array [0][1] and so on. And first value of second inner array can be accessed by $array [1][0], second value by $array [1][1] and so on. See the example, you will get an idea.

Syntax:
Two ways to implement php associative array are..
$arrayname = array ( array('value00',value01,'value02'), // string,int,string array('value10',value11,'value12'), array('value20',value21,'value22'), array('value30',value31,'value32') );
Example:
<?php $Stud_Detail = array ( array('Student1',22,'TamilNadu'), // student name,age,location array('Student2',15,'Delhi'), array('Student3',25,'London'), array('Student4',17,'Bombay') ); echo "<b>Student Name : </b>".$Stud_Detail [0][0]. ", <b>Age :</b> " .$Stud_Detail [0][1]. ", <b>Location :</b> ".$Stud_Detail [0][2]. "<br>"; echo "<b>Student Name : </b>".$Stud_Detail [1][0]. ", <b>Age :</b> " .$Stud_Detail [1][1]. ", <b>Location :</b> ".$Stud_Detail [1][2]. "<br>"; echo "<b>Student Name : </b>".$Stud_Detail [2][0]. ", <b>Age :</b> " .$Stud_Detail [2][1]. ", <b>Location :</b> ".$Stud_Detail [2][2]. "<br>"; echo "<b>Student Name : </b>".$Stud_Detail [3][0]. ", <b>Age :</b> " .$Stud_Detail [3][1]. ", <b>Location :</b> ".$Stud_Detail [3][2]. "<br>"; ?>
Output:

Student Name : Student1, Age : 22, Location : TamilNadu
Student Name : Student2, Age : 15, Location : Delhi
Student Name : Student3, Age : 25, Location : London
Student Name : Student4, Age : 17, Location : Bombay

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