Associative array in PHP
Associative array is an array where each ID key is associated with a value.
Associative array example:
<html>
<body>
/* Here rose, daisy
and orchid indicates ID key and 5.00, 4.00, 2.00 indicates their
values respectively*/
$flower_shop = array (
"rose" =>
"5.00",
"daisy" =>
"4.00",
"orchid" =>
"2.00"
);
//
Display the array values
echo "rose costs
.$flower_shop['rose'].",daisy costs
".$flower_shop['daisy'].",and orchid
costs
".$flower_shop['orchid']."";
?>
</body>
</html>
OUTPUT of the
above given Example is as follows:
rose costs 5.00,daisy costs 4.00,and orchid
costs
Loop through an Associative Array
<html>
<body>
<?php
$flower_shop=array("rose"=>"5.00",
"daisy"=>"4.00","orchid"=>"2.00");
/* for each loop works only on
arrays, and is used
to loop through each key/value pair
in an array */
foreach($flower_shop as
$x=>$x_value) {
echo "Flower=" . $x
.
", Value=" .
$x_value;
echo "<br>";
}
?>
</body>
</html>
OUTPUT of the above given Example is as follows:
Flower=rose, Value=5.00
Flower=daisy, Value=4.00
Flower=orchid, Value=2.00Multidimensional array in PHP
§
Multidimensional array is an array containing one or more arrays.
Multidimensional array Example
<html>
<body>
<?php
/* Here $flower_shop is an array, where
rose, daisy and orchid
are the ID key which indicates
rows and points to array which
have column values. */
$flower_shop
= array(
"rose"
=> array( "5.00", "7 items", "red" ),
"daisy"
=> array( "4.00", "3 items", "blue" ),
"orchid"
=> array( "2.00", "1 item", "white" ),
);
/* in the array
$flower_shop['rose'][0], ‘rose’ indicates row and ‘0’ indicates column */
echo
"rose costs ".$flower_shop['rose'][0].
",
and you get ".$flower_shop['rose'][1].".<br>";
echo
"daisy costs ".$flower_shop['daisy'][0].
", and you get
".$flower_shop['daisy'][1].".<br>";
echo
"orchid costs ".$flower_shop['orchid'][0].
", and you get".$flower_shop['orchid'][1].".<br>";
?>
</body>
</html>
daisy costs 4.00, and you get 3 items.
orchid costs 2.00, and you get 1 item
OUTPUT of the
above given Example is as follows:
rose costs 5.00, and you get 7 items.daisy costs 4.00, and you get 3 items.
orchid costs 2.00, and you get 1 item
- Scripts will interact with their clients using one of the two HTTP methods. The methods are GET and POST
- When a form is submitted using the GET method, its values are encoded directly in the query string portion of the URL
- When a form is submitted using the POST method, its values will not be displayed the query string portion of the URL.
The $_GET Function
- The built-in $_GET function is used to collect values from a form sent with method="get"
- Information sent from a form with the GET method is visible to everyone (it will be displayed in the browser's URL) and has limits on the amount of information to send (max. 100 characters)
- This method should not be used when sending passwords or other sensitive information. However, because the variables are displayed in the URL, it is possible to bookmark the page.
- The get method is not suitable for large variable values; the value cannot exceed 100 characters.
The $_POST Function
- The built-in $_POST function is used to collect values from a form sent with method="post".
- Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send.
- However, there is an 8 Mb max size for the POST method, by default (can be changed by setting the post_max_size in the php.ini file).
The $_GET Function Example
Form1.html
<html>
<body>
/* form submitted using ‘get’ method, action specifies
next page which is to be loaded when button is clicked*/
<form action="welcome.php" method="get">
// textbox is to take user input
Name: <input type="text" name="fname" />
Age: <input type="text" name="age" />
// Submit button is to submit the value
<input type="submit" />
</form>
</body>
</html>
welcome.php
<html>
<body>
// $_GET to receive
the data sent from Form1.html
Welcome <?php echo $_GET["fname"]; ?>.<br />
You are <?php
echo $_GET["age"]; ?> years old!
</body>
</html>
OUTPUT of the above given Example is
as follows:
In this
example, when you click on the “submit” button, the values entered in the
text box are
encoded directly in the query string portion of the URL.
