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