reference/var/functions/is-bool.xml
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0c9c2dd669fe9395eaa73d487fbd160f9057429a
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<?xml version="1.0" encoding="iso-8859-1"?>
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.is-bool" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>is_bool</methodname>
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<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
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<methodparam><type>mixed</type><parameter>value</parameter></methodparam>
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</methodsynopsis>
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<para>
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Finds whether the given variable is a boolean.
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>var</parameter></term>
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<term><parameter>value</parameter></term>
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<listitem>
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<para>
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The variable being evaluated.
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns &true; if <parameter>var</parameter> is a <type>boolean</type>,
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Returns &true; if <parameter>value</parameter> is a <type>bool</type>,
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&false; otherwise.
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</para>
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</refsect1>
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$a = false;
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$b = 0;
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// Since $a is a boolean, this is true
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if (is_bool($a)) {
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// Since $a is a boolean, it will return true
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if (is_bool($a) === true) {
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echo "Yes, this is a boolean";
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}
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// Since $b is not a boolean, this is not true
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if (is_bool($b)) {
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echo "Yes, this is a boolean";
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// Since $b is not a boolean, it will return false
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if (is_bool($b) === false) {
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echo "No, this is not a boolean";
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}
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?>
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]]>
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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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