Is_string () PHP Function

The Is_string () PHP function is used to check if a value is a string. This could be used within an if () statement to treat strings in one way and non-strings in another. It will return true or false.

 <?php 
 if (is_string(23)) 
 {
 echo "Yes";
 } else {
 echo "No";
 }
 ?>
 

The code above should output "No" because 23 is not a string. Let's try this again:

 <?php 
 if (is_string("Hello World")) 
 {
 echo "Yes";
 } else {
 echo "No";
 }
 ?>
 

Since "Hello World" is a string, this would echo "Yes".