repo_zf1/documentation/manual/en/module_specs/Zend_Validate-Identical.xml

<?xml version="1.0" encoding="UTF-8"?>
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<sect2 id="zend.validate.set.identical">

    <title>Identical</title>

    <para>
        <classname>Zend_Validate_Identical</classname> allows you to validate if a given value is
        identical with an set haystack.
    </para>

    <sect3 id="zend.validate.set.identical.basic">
        <title>Basic usage</title>

        <para>
            To validate if two values are identical you need to set the origin value as haystack.
            See the following example which validates two strings.
        </para>

        <programlisting language="php"><![CDATA[
$valid = new Zend_Validate_Identical('origin');
if ($valid->isValid($value) {
    return true;
}
]]></programlisting>

        <para>
            The validation will only then return <constant>TRUE</constant> when both values are
            100% identical. In our example, when <varname>$value</varname> is 'origin'.
        </para>

        <para>
            You can set the wished token also afterwards by using the method
            <methodname>setToken()</methodname> and <methodname>getToken()</methodname> to get
            the actual set token.
        </para>
    </sect3>

    <sect3 id="zend.validate.set.identical.types">
        <title>Identical objects</title>

        <para>
            Of course <classname>Zend_Validate_Identical</classname> can not only validate strings,
            but also any other variable type like Boolean, Integer, Float, Array or even Objects.
            As already noted Haystack and Value must be identical.
        </para>

        <programlisting language="php"><![CDATA[
$valid = new Zend_Validate_Identical(123);
if ($valid->isValid($input)) {
    // input appears to be valid
} else {
    // input is invalid
}
]]></programlisting>

        <note>
            <title>Type comparison</title>

            <para>
                You should be aware that also the type of a variable is used for validation.
                This means that the string <emphasis>'3'</emphasis> is not identical with the
                integer <emphasis>3</emphasis>.
            </para>

            <para>
                This is also the case for Form Elements. They are objects or arrays. So you can't
                simply compare a Textfield which contains a password with an textual password
                from another source. The Element itself is given as array which also contains
                additional informations.
            </para>
        </note>
    </sect3>

    <sect3 id="zend.validate.set.identical.configuration">
        <title>Configuration</title>

        <para>
            As all other validators also <classname>Zend_Validate_Identical</classname> supports
            the usage of configuration settings as input parameter. This means that you can
            configure this validator with an <classname>Zend_Config</classname> object.
        </para>

        <para>
            But this adds one case which you have to be aware. When you are using an array as
            haystack then you should wrap it within an <property>'token'</property> key when
            it could contain only one element.
        </para>

        <programlisting language="php"><![CDATA[
$valid = new Zend_Validate_Identical(array('token' => 123));
if ($valid->isValid($input)) {
    // input appears to be valid
} else {
    // input is invalid
}
]]></programlisting>

        <para>
            The above example validates the integer 123. The reason for this special case is, that
            you can configure the token which has to be used by giving the
            <property>'token'</property> key.
        </para>

        <para>
            So, when your haystack contains one element and this element is named
            <property>'token'</property> then you have to wrap it like shown in the example below.
        </para>

        <programlisting language="php"><![CDATA[
$valid = new Zend_Validate_Identical(array('token' => array('token' => 123)));
if ($valid->isValid($input)) {
    // input appears to be valid
} else {
    // input is invalid
}
]]></programlisting>
    </sect3>
</sect2>
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