International PHP Conference 2015


(PHP 4, PHP 5, PHP 7)

is_stringFind whether the type of a variable is string


bool is_string ( mixed $var )

Finds whether the type given variable is string.



The variable being evaluated.

Return Values

Returns TRUE if var is of type string, FALSE otherwise.


Example #1 is_string() example

= array(falsetruenull'abc''23'23'23.5'23.5''' ''0'0);
foreach (
$values as $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 add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top