is_scalar
(PHP 4 >= 4.0.5, PHP 5)
is_scalar --
Finds whether a variable is a scalar
Description
bool
is_scalar ( mixed var )
Finds whether the given variable is a scalar.
Scalar variables are those containing an integer,
float, string or boolean.
Types array, object and resource
are not scalar.
Note:
is_scalar() does not consider resource
type values to be scalar as resources are abstract datatypes
which are currently based on integers. This implementation detail should
not be relied upon, as it may change.
Parameters
- var
The variable being evaluated.
Return Values
Returns TRUE if var is a scalar FALSE
otherwise.
Examples
Example 1. is_scalar() example
<?php
function show_var($var)
{
if (is_scalar($var)) {
echo $var;
} else {
var_dump($var);
}
}
$pi = 3.1416;
$proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");
show_var($pi);
show_var($proteins)
?>
|
The above example will output: 3.1416
array(3) {
[0]=>
string(10) "hemoglobin"
[1]=>
string(20) "cytochrome c oxidase"
[2]=>
string(10) "ferredoxin"
} |
|