Using is_string() on an object will always return false (even with __toString()).
<?php
class B {
public function __toString() {
return "Instances of B() can be treated as a strings!\n";
}
}
$b = new B();
print($b); //Instances of B() can be treated as a strings!
print(is_string($b) ? 'true' : 'false'); //false
?>| CARVIEW |
Select Language
HTTP/2 200
server: myracloud
date: Thu, 24 Jul 2025 06:53:52 GMT
content-type: text/html; charset=utf-8
content-language: en
permissions-policy: interest-cohort=()
x-frame-options: SAMEORIGIN
link: ; rel=shorturl
last-modified: Thu, 24 Jul 2025 06:01:09 GMT
content-encoding: gzip
vary: accept-encoding
expires: Thu, 24 Jul 2025 06:53:52 GMT
cache-control: max-age=0
PHP: is_string - Manual
is_string
(PHP 4, PHP 5, PHP 7, PHP 8)
is_string — Find whether the type of a variable is string
Parameters
value-
The variable being evaluated.
Examples
Example #1 is_string() example
<?php
$values = array(false, true, null, 'abc', '23', 23, '23.5', 23.5, '', ' ', '0', 0);
foreach ($values as $value) {
echo "is_string(";
var_export($value);
echo ") = ";
echo var_dump(is_string($value));
}
?>The above example will output:
is_string(false) = bool(false)
is_string(true) = bool(false)
is_string(NULL) = bool(false)
is_string('abc') = bool(true)
is_string('23') = bool(true)
is_string(23) = bool(false)
is_string('23.5') = bool(true)
is_string(23.5) = bool(false)
is_string('') = bool(true)
is_string(' ') = bool(true)
is_string('0') = bool(true)
is_string(0) = bool(false)
See Also
- is_float() - Finds whether the type of a variable is float
- is_int() - Find whether the type of a variable is integer
- is_bool() - Finds out whether a variable is a boolean
- is_object() - Finds whether a variable is an object
- is_array() - Finds whether a variable is an array
＋add a note
User Contributed Notes 2 notes
laszlo dot heredy shift-two gmail etc ¶
11 years ago
Peter Barney ¶
7 years ago
As noted earlier, is_string() returns false on an object that has a __toString() method. Here is a simple way to do a check that will work:
<?php
// determine if the passed argument can be treated like a string.
function is_stringy($text) {
return (is_string($text) || (is_object($text) && method_exists($text, '__toString' ));
}
↑ and ↓ to navigate •
Enter to select •
Esc to close
Press Enter without
selection to search using Google