1. PHP
Arrays
Functions

2. Array An array can store many values at once within a single variable.
Types of Arrays in PHP
There are three types of arrays that you can create. These are:
Indexed array — An array with a numeric key.
Associative array — An array where each key has its own specific value.
Multidimensional array — An array containing one or more arrays within itself.

3. Indexed Arrays
An indexed or numeric array stores each array element with a numeric index. The following examples shows two ways of creating an indexed array, the easiest way is
<?php
$colors = array("Red", "Green", "Blue");
print_r($colors);
?>

4. Print_r() function
The print_r() function is used to print human-readable information about a variable.
 the variable is an integer or a float or a string the function returns value of the variable. If the variable is an array the function returns keys and elements.

5. Indexed Arrays-Example
<?php $cname= array ('Pakistan', 'Saudia Arabia','Turkey'); $salary= array (400, 3800,6700); print_r($cname); echo '<br>'; print_r($salary); echo '<hr>'; ?>

6. How to to extract through loops
<?php $colors = array("Red", "Green", "Blue"); for ($a=0; $a<3; $a++) { echo "Name:". $colors[$a]. "<br>"; } echo "<hr>";

7. Foreach Loop syntax
The “foreach” loop gives PHP an easy way to iterate over arrays and can only be used on arrays.
First syntax
foreach ($array as $value)
{ code to be executed; }
Second syntax
foreach ($array as $key => $value) {
code to be executed;

8. For Loop-indexed array
<?php $colors = array("Red", "Green", "Blue"); for ($a=0; $a<3; $a++) { echo "Name:". $colors[$a]. "<br>"; } Output:

9. Fore each-indexed array
$books= array ("PHP","C++","Java","Perl”,"python");
foreach ( $books as $val) {
echo $val. "<br>";
Output: }

10. How to use counter to display data
$counter=1; foreach ( $books as $val) { echo $counter . ". " . $val. "<br>"; $counter++; } Output: echo "<br>";

11. Associative Arrays
$ages = array("Nauman"=>22, "Hamid"=>32, "Danish"=>28); foreach ($ages as $x=>$y) { echo "Name: ". $x. "<br>"; echo "Age:" . $y. "<br>"; Output: }

12. Associative array: display in HTML Table
$ages = array("Nauman"=>22, "Hamid"=>32, "Danish"=>28);
echo "<table border=1> <tr><td> Name</td> <td> Age</td> </tr>";
foreach ($ages as $x=>$y) {
echo "<tr><td>" . $x . "</td>";
echo "<td>" . $y . "</td></tr>"; }
echo "</table>"; Output:

13. Multidimensional array
$contacts = array( array( "name" => "Nauman", " " => ), "name" => "Hamid", " " => "name" => "Danish", " " => ) );

14. Multidimension array-Example
$contacts = array(
array(
"name" => "Nauman",
" " => ),
"name" => "Hamid",
" " =>
"name" => "Danish",
" " => ) );

15. Multidimensional array..con
foreach ($contacts as $contacts_1) foreach ($contacts_1 as $x=>$y ) { echo $x . ":" . $y ."<br>"; } Output: