Write a PHP program to concatenate a integer and string.
<?php
$var1= 30;
$var2 = " Age of John is ";
echo $var2.$var1;
?>
Get datatype of a variable.
<?php
$var1 = 299;
$var2 = 'Hello World';
echo gettype($var1);
echo '<br/>';
echo gettype($var2);
?>
Check integer value.
<?php
$var1 = 299;
$var2 = 'Hello World';
echo is_int($var1);
echo '<br/>';
echo is_int($var2);
?>
Check string value.
<?php
$var1 = 299;
$var2 = 'Hello World';
echo is_string($var1);
echo '<br/>';
echo is_string($var2);
?>
Example of compound datatype.
<?php
$arr = array(11, 2, array('John', 'Smith'));
var_dump($arr);
?>
check resource datatype.
<?php
$res = mysql_connect();
$res1 = fopen();
echo get_resource_type($res);
echo '<br/>';
echo get_resource_type($res1);
?>
check null datatype.
<?php
$a = NULL;
if(is_null($a)) {
echo 'Value of a is null';
}
echo '<br/>';
?>