How to determine whether it is a string in php

In PHP, you can use the "is_string" function to determine whether a variable is a string. It can be understood that this function only detects the type. Even if a variable is empty, as long as it is a string type, it will return true. Its usage syntax is "bool is_string (mixed $var)".

Recommended: "PHP Video Tutorial"

is_string() detects whether the variable is of string type and returns the value Is true or false. It can be understood here that it only detects the type. Even if a variable is empty, it will return true as long as it is a string type.

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

Syntax

bool is_string ( mixed $var )

Parameter description:

$var: Variable to be detected.

Return value

If the specified variable is a string, TRUE is returned, otherwise FALSE is returned.

Example

The output result is:

This is a string.

bool(true) bool(true) bool(false) bool(false)

The above is the detailed content of How to determine whether it is a string in php. For more information, please follow other related articles on the PHP Chinese website!