reference/var/functions/is-string.xml
0c9c2dd669fe9395eaa73d487fbd160f9057429a
0c9c2dd669fe9395eaa73d487fbd160f9057429a
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>is_string</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 type given variable is string.
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Finds whether the type of the given variable is string.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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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 of type <type>string</type>,
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Returns &true; if <parameter>value</parameter> is of type <type>string</type>,
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&false; otherwise.
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</para>
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</refsect1>
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<programlisting role="php">
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<![CDATA[
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<?php
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if (is_string("23")) {
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echo "is string\n";
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} else {
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echo "is not an string\n";
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$values = array(false, true, null, 'abc', '23', 23, '23.5', 23.5, '', ' ', '0', 0);
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foreach ($values as $value) {
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echo "is_string(";
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var_export($value);
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echo ") = ";
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echo var_dump(is_string($value));
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}
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var_dump(is_string('abc'));
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var_dump(is_string("23"));
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var_dump(is_string(23.5));
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var_dump(is_string(true));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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is string
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bool(true)
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bool(true)
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bool(false)
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bool(false)
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is_string(false) = bool(false)
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is_string(true) = bool(false)
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is_string(NULL) = bool(false)
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is_string('abc') = bool(true)
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is_string('23') = bool(true)
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is_string(23) = bool(false)
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is_string('23.5') = bool(true)
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is_string(23.5) = bool(false)
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is_string('') = bool(true)
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is_string(' ') = bool(true)
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is_string('0') = bool(true)
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is_string(0) = bool(false)
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]]>
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</screen>
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</example>
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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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