PHP: Hypertext Preprocessor (original) (raw)

is_string

(PHP 4, PHP 5, PHP 7, PHP 8)

is_string — Find whether the type of a variable is string

Description

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

Found A Problem?

laszlo dot heredy shift-two gmail etc ¶

11 years ago

`Using is_string() on an object will always return false (even with __toString()).

`

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:

bool(false)

`