is_string
PHP function
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(PHP 4, PHP 5, PHP 7, PHP 8)
Find whether the type of a variable is string
Description
is_string(mixed $value): bool
Finds whether the type of the given variable is string.
Parameters
valueThe variable being evaluated.
Return Values
Returns true if value is of type string, false otherwise.
Examples
is_string() example
php
<?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:
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)