RetroSearch Browse

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from http://www.php.net/is_scalar below:

PHP: is_scalar - Manual

is_scalar

(PHP 4 >= 4.0.5, PHP 5, PHP 7, PHP 8)

is_scalar — Finds whether a variable is a scalar

Description

See scalar types for more information.

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.

Note:

is_scalar() does not consider NULL to be scalar.

Parameters

value: The variable being evaluated.

Return Values

Returns true if value is a scalar, false otherwise.

Examples

Example #1 is_scalar() example

<?php
function show_var($var) 

    {

    if (is_scalar($var)) {

    echo $var, PHP_EOL;

    } 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() - Finds whether the type of a variable is float
is_int() - Find whether the type of a variable is integer
is_numeric() - Finds whether a variable is a number or a numeric string
is_real() - Alias of is_float
is_string() - Find whether the type of a variable is string
is_bool() - Finds out whether a variable is a boolean
is_object() - Finds whether a variable is an object
is_array() - Finds whether a variable is an array

Dr K ¶

19 years ago

Having hunted around the manual, I've not found a clear statement of what makes a type "scalar" (e.g. if some future version of the language introduces a new kind of type, what criterion will decide if it's "scalar"? - that goes beyond just listing what's scalar in the current version.) 
  In other lanuages, it means "has ordering operators" - i.e. "less than" and friends.
  It (-:currently:-) appears to have the same meaning in PHP.

Anonymous ¶

18 years ago

Another warning in response to the previous note:

   > just a warning as it appears that an empty value is not a scalar. 
  That statement is wrong--or, at least, has been fixed with a later revision than the one tested. The following code generated the following output on PHP 4.3.9.
  CODE:

<?php
echo('is_scalar() test:'.EOL);

    echo("NULL: " . print_R(is_scalar(NULL), true) . EOL);

    echo("false: " . print_R(is_scalar(false), true) . EOL);

    echo("(empty): " . print_R(is_scalar(''), true) . EOL);

    echo("0: " . print_R(is_scalar(0), true) . EOL);

    echo("'0': " . print_R(is_scalar('0'), true) . EOL);
?>


   OUTPUT:

   is_scalar() test:

   NULL: 

   false: 1

   (empty): 1

   0: 1

   '0': 1 
  THUS:


   * NULL is NOT a scalar

   * false, (empty string), 0, and "0" ARE scalars

efelch at gmail dot com ¶

19 years ago

A scalar is a single item or value, compared to things like arrays and objects which have multiple values. This tends to be the standard definition of the word in terms of programming. An integer, character, etc are scalars. Strings are probably considered scalars since they only hold "one" value (the value represented by the characters represented) and nothing else.

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.3