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Editor to share with you how php determines whether a variable is a string or not, I believe most people do not know much about it, so share this article for your reference. I hope you will gain a lot after reading this article. Let's learn about it together.

In php, you can use the is_string () function to determine whether a variable is a string, the syntax "is_string ($var)"; if the specified variable is a string, it returns TRUE, otherwise it returns FALSE.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

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

Bool is_string (mixed $var)

Parameter description:

Var: the variable to be detected.

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

Return value: returns TRUE if the specified variable is a string, FALSE otherwise.

Example: the is_string () function determines whether a variable is a string

Output result:

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