How to determine if a variable is a string in php

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

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

is_string() function is used to detect whether the variable is String. Syntax format:

bool is_string ( mixed $var )

Parameter description:

• $var: variable to be detected.
  

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

Return value: If the specified variable is a string, then Returns TRUE, otherwise returns FALSE.

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

<?php
header("Content-type:text/html;charset=utf-8");
$a=123;
var_dump($a);
var_dump(is_string($a));
if (is_string($a)){
    echo "这是一个字符串。". "<br>";
}
else{
    echo "这不是一个字符串。". "<br>";
}
$b="123";
var_dump($b);
var_dump(is_string($b));
if (is_string($b)){
    echo "这是一个字符串。". "<br>";
}
else{
    echo "这不是一个字符串。". "<br>";
}
?>

Output result:

Recommended learning: "PHP Video Tutorial"

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