PHP - is_string() Function
Definition and Usage
The function is_string() verifies whether the type of a variable is string.
Syntax
bool is_string ( mixed $value )
Parameters
| Sr.No |
Parameter & Description |
| 1 |
value
The variable being evaluated.
|
Return Values
This function returns true if value is a string, false otherwise. This function does not consider NULL to be scalar.
Dependencies
PHP 4 and above
Example
Following example demonstrates use of function is_string() −
<?php
$a = "Tutorialspoint";
echo "a is ".( is_string($a)? 'string' : 'not string') . "<br>";
$b = 0;
echo "b is ".( is_string($b)? 'string' : 'not string') . "<br>";
$c = 40;
echo "c is ".( is_string($c)? 'string' : 'not string') . "<br>";
$d = NULL;
echo "d is ".( is_string($d)? 'string' : 'not string') . "<br>";
$e = array("a", "b", "c");
echo "e is ".( is_string($e)? 'string' : 'not string') . "<br>";
$f = 3.1416;
echo "f is ".( is_string($f)? 'string' : 'not string') . "<br>";
$g = new stdClass();
echo "g is ".( is_string($g)? 'string' : 'not string') . "<br>";
$h = '';
echo "h is ".( is_string($h)? 'string' : 'not string') . "<br>";
?>
Output
This will produce following result −
a is string
b is not string
c is not string
d is not string
e is not string
f is not string
g is not string
h is string
php_variable_handling_functions.htm
