is_scalar
Finds whether a variable is a scalar
Description
bool is_scalar
( mixed $var
)
Scalar variables are those containing an integer,
float, string or boolean.
Types array, object and resource
are not scalar.
Note:
is_scalar does not consider resource
type values to be scalar as resources are abstract datatypes
which are currently based on integers. This implementation detail should
not be relied upon, as it may change.
Note:
is_scalar does not consider NULL to be scalar.
Parameters
-
var
-
The variable being evaluated.
Return Values
Returns TRUE if var is a scalar, FALSE
otherwise.
Examples
Example #1 is_scalar example
<?php
function show_var($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"
}
See Also
- is_float
- is_int
- is_numeric
- is_real
- is_string
- is_bool
- is_object
- is_array