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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.

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.

Parametre

var

The variable being evaluated.

Vrátené hodnoty

Returns TRUE if var is a scalar FALSE otherwise.

Príklady

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)

?>

Výstup horeuvedeného príkladu bude:

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

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Variables handling
PHP Manual