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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@129424 c90b9560-bf6c-de11-be94-00142212c4b1
102 lines
2.8 KiB
XML
102 lines
2.8 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.3 $ -->
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<!-- splitted from ./en/functions/var.xml, last change in rev 1.35 -->
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<refentry id="function.is-scalar">
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<refnamediv>
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<refname>is_scalar</refname>
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<refpurpose>
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Finds whether a variable is a scalar
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>bool</type><methodname>is_scalar</methodname>
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<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>is_scalar</function> returns &true; if the variable
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given by the <parameter>var</parameter> parameter is a scalar,
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otherwise it returns &false;.
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</para>
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<para>
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Scalar variables are those containing an <type>integer</type>,
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<type>float</type>, <type>string</type> or <type>boolean</type>.
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Types <type>array</type>, <type>object</type> and <type>resource</type>
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or not scalar.
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<informalexample>
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<programlisting role="php">
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<!-- TODO: better example, this one can be quite misleading for unexperienced
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programmers. -->
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<![CDATA[
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<?php
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function show_var($var) {
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if (is_scalar($var)) {
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echo $var;
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} else {
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var_dump($var);
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}
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}
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$pi = 3.1416;
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$proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");
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show_var($pi);
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// prints: 3.1416
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show_var($proteins)
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// prints:
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// array(3) {
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// [0]=>
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// string(10) "hemoglobin"
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// [1]=>
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// string(20) "cytochrome c oxidase"
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// [2]=>
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// string(10) "ferredoxin"
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// }
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?>
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]]>
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</programlisting>
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</informalexample>
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</para>
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<note>
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<para>
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<function>is_scalar</function> does not consider <type>resource</type>
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type values to be scalar as resources are abstract datatypes
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which are currently based on integers. This implementation detail should
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not be relied upon, as it may change.
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</para>
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</note>
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<para>
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See also <function>is_bool</function>,
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<function>is_numeric</function>,
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<function>is_float</function>,
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<function>is_int</function>,
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<function>is_real</function>,
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<function>is_string</function>,
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<function>is_object</function>,
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<function>is_array</function>, and
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<function>is_integer</function>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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