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Web Technologies-I

Notes Example:

$addresses = array(‘spam@cyberpromo.net’,

‘abuse@example.com’, ‘root@example.com’);
$got_spam = in_array(‘spam@cyberpromo.net’,
$addresses);
// $got_spam is true $got_milk = in_array(‘milk@tucows.com’, $addresses); // $got_milk is false

PHP automatically indexes the values in arrays, so in_array( ) is much faster than a loop that
checks every value to find the one you want.

Example checks whether the user has entered information in all the required fields in a form.
Searching an array

<?php
function have_required($array , $required_fields) {
foreach($required_fields as $field) {

if(empty($array[$field])) return false;
} return true;
}

if($submitted) {
echo ‘<p>You ‘;
echo have_required($_POST, array(‘name’, ‘email_address’)) ? ‘did’ : ‘did not’;

echo ‘ have all the required fields.</p>’;
} ?>
<form action=”<?= $PHP_SELF; ?>” method=”POST”>

<p>
Name: <input type=”text” name=”name” /><br />
Email address: <input type=”text” name=”email_address” /><br />

Age (optional): <input type=”text” name=”age” />
</p>
<p align=”center”> <input type=”submit” value=”submit” name=”submitted” /> </p>

</form>
A variation on in_array( ) is the array_search( ) function. While in_array( ) returns true if the
value is found, array_search( ) returns the key of the found element:
$person = array(‘name’ => ‘Pradip’, ‘age’ => 35, ‘wife’ => ‘Riya’);
$k = array_search($person, ‘Riya’);
echo(“Pradip’s $k is Riya\n”);

Pradip’s wife is Riya

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