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is_scalar

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)

?>

Výše uvedený příklad vypíše:

3.1416
array(3) {
  [0]=>
  string(10) "hemoglobin"
  [1]=>
  string(20) "cytochrome c oxidase"
  [2]=>
  string(10) "ferredoxin"
}