is_scalar
(PHP 4 >= 4.0.5, PHP 5)
is_scalar --
Finds whether a variable is a scalar
Popis
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.
Poznámka:
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.
Seznam parametrů
var
The variable being evaluated.
Návratové hodnoty
Returns TRUE if var
is a scalar FALSE
otherwise.
Příklady
Příklad 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)
?>
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Výše uvedený příklad vypíše: 3.1416
array(3) {
[0]=>
string(10) "hemoglobin"
[1]=>
string(20) "cytochrome c oxidase"
[2]=>
string(10) "ferredoxin"
} |
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