PHP | is_string() Function

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

<?php

$str = "GeeksforGeeks";

// 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";
    }
}

?>

Program 2: php

<?php

$num = 21;
var_dump(is_string($num));

$arr = array(
        "a" => "Welcome",
        "b" => 2,
        "c" => "GeeksforGeeks"
    );

var_dump(is_string($arr["a"]));
var_dump(is_string($arr["b"]));
var_dump(is_string($arr["c"]));

?>

Reference: https://www.php.net/manual/en/function.is-string.php