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is_scalar

(PHP 4 >= 4.0.5, PHP 5)

is_scalar --  Finds whether a variable is a scalar

Beschreibung

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.

Anmerkung: 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.

Parameter Liste

var

The variable being evaluated.

Rückgabewerte

Returns TRUE if var is a scalar FALSE otherwise.

Beispiele

Beispiel 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)

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

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

Siehe auch

is_float()
is_int()
is_numeric()
is_real()
is_string()
is_bool()
is_object()
is_array()

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