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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 )

is_scalar() returns `TRUE` if the variable given by the var parameter is a scalar, otherwise it returns `FALSE`.

Scalar variables are those containing an integer, float, string or boolean. Types array, object and resource are not scalar.

`<?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); // prints: 3.1416 show_var($proteins) // prints: // array(3) { // [0]=> // string(10) "hemoglobin" // [1]=> // string(20) "cytochrome c oxidase" // [2]=> // string(10) "ferredoxin" // } ?>`

> 注: 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.

See also is_bool(), is_numeric(), is_float(), is_int(), is_real(), is_string(), is_object(), and is_array().

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