The is_string() function is an inbuilt function in PHP which is used to check whether the given value is a string or not.
Syntax:
bool is_string( mixed $var )
Parameters: This function accepts one parameter as mentioned above and described below:
- $var: It contains the value that need to check.
Return Value: It returns TRUE if the value of variable is of string type and FALSE otherwise.
Program 1:
<?php   $str = "neveropen";   // Check value of variable is set or not if(is_string($str)) {     echo "String"; } else {     echo "Not String"; }   $arr = array(10, 25.56, 'G', true, 'Geeks');   foreach ($arr as $index) {     if(is_string($index)) {         echo "\nString";     }     else {         echo "\nNot String";     } }   ?> |
Output:
String Not String Not String String Not String String
Program 2:
<?php   $num = 21; var_dump(is_string($num));   $arr = array(         "a" => "Welcome",         "b" => 2,         "c" => "neveropen"    );   var_dump(is_string($arr["a"])); var_dump(is_string($arr["b"])); var_dump(is_string($arr["c"]));   ?> |
Output:
bool(false) bool(true) bool(false) bool(true)
Reference: https://www.php.net/manual/en/function.is-string.php
