3.PHP Arrays

1. Enumerated Arrays 

Initializing Arrays 

$users =array(“hi”,”hello”,”there”);

or

$users[]=“hi”;

$users[]=“hello”;

$users[]=“there”;

or

$users[1]=“hi”;

$users[2]=“hello”;

$users[3]=“there”;

or 

$users[100]=“hi”;

$users[200]=“hello”;

$users[300]=“there”;

Appending to an Array 

$users =array(“hi”,”hello”,”there”);

$users[] = “John”;

Accessing

$first = $users[0];

$second = $users[1];

$third = $users[2];

$fourth = $users[3];

Looping through

You can use the ordinary loop

or 

foreach($var as $val)

Ex.

foreach($users as $container)

{

print “$container”;

}

2. Associative Arrays 

Initializing

$one_piece = array(

“name”=>”Luffy”,

“power”=>”rubber”,

“profession”=>”pirate”

 );

Accessing

echo $one_piece['name'];

Looping through

foreach($var as $key=>$val)

Ex.

foreach($one_piece as $key=>$content)

{

print “$key: $content”;

}

3. Multi-dimensional Array

Initializing

<?php 

$shop = array( array("rose", 1.25 , 15),

               array("daisy", 0.75 , 25),

               array("orchid", 1.15 , 7) 

             ); 

?>

Accessing

<?php 

echo "<h1>Manual access to each element</h1>";

echo $shop[0][0]." costs ".$shop[0][1]." and you get ".$shop[0][2]."<br />";

echo $shop[1][0]." costs ".$shop[1][1]." and you get ".$shop[1][2]."<br />";

echo $shop[2][0]." costs ".$shop[2][1]." and you get ".$shop[2][2]."<br />";

echo "<h1>Using loops to display array elements</h1>";

echo "<ol>";

for ($row = 0; $row < 3; $row++)

{

    echo "<li><b>The row number $row</b>";

    echo "<ul>";

    for ($col = 0; $col < 3; $col++)

    {

        echo "<li>".$shop[$row][$col]."</li>";

    }

    echo "</ul>";

    echo "</li>";

}

echo "</ol>";

4. Array Manipulation Functions

print_r($arr) 

array_merge($arr1, $arr2)

array_push($arr1,1,2,3….)

array_unshift($arr1,1,2,3..)

array_shift($arr1,1,2,3..)

array_slice($arr1,start,number)

sort($arr)

rsort($arr)

asort($arr)

ksort($arr)

array_pad($arr,total_number,’’)

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