PHP is_string() function

The is_string() function is used to detect whether a variable is a string.

PHP version requirements: PHP 4, PHP 5, PHP 7

grammar

 bool is_string (mixed $var)

Parameter description:

$var: The variable to be tested.

return value

Returns TRUE if the specified variable is a string, otherwise returns FALSE.

Example

Example

The output is:

 This is a string. bool(true)bool(true)bool(false)bool(false)