PHP | is_string() Function
Last Updated :
27 Apr, 2020
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
$str = "GeeksforGeeks";
if(is_string($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";
}
}
?>
|
Output:
String
Not String
Not String
String
Not String
String
Program 2:
<?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"]));
?>
|
Output:
bool(false)
bool(true)
bool(false)
bool(true)
Reference: https://www.php.net/manual/en/function.is-string.php
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