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is_scalar

(PHP 4 >= 4.0.5, PHP 5)

is_scalar --  Finds whether a variable is a scalar

Description

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.

Parameters

var

The variable being evaluated.

Return Values

Returns TRUE if var is a scalar FALSE otherwise.

Examples

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)

?>

The above example will output:

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

See Also

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

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