How can you define a multiple selection in an HTML form using PHP?

When defining a multiple selection in an HTML form using PHP, you can use the 'multiple' attribute within the <select> tag. This attribute allows users to select multiple options by holding down the Ctrl key while clicking on the options. To handle the selected values in PHP, you can use the $_POST superglobal array to retrieve the selected options. 

&lt;form method=&quot;post&quot;&gt;
    &lt;select name=&quot;colors[]&quot; multiple&gt;
        &lt;option value=&quot;red&quot;&gt;Red&lt;/option&gt;
        &lt;option value=&quot;blue&quot;&gt;Blue&lt;/option&gt;
        &lt;option value=&quot;green&quot;&gt;Green&lt;/option&gt;
        &lt;option value=&quot;yellow&quot;&gt;Yellow&lt;/option&gt;
    &lt;/select&gt;
    &lt;input type=&quot;submit&quot; value=&quot;Submit&quot;&gt;
&lt;/form&gt;

&lt;?php
if ($_SERVER[&quot;REQUEST_METHOD&quot;] == &quot;POST&quot;) {
    if(isset($_POST[&#039;colors&#039;])){
        $selectedColors = $_POST[&#039;colors&#039;];
        echo &quot;Selected colors: &quot; . implode(&quot;, &quot;, $selectedColors);
    } else {
        echo &quot;No colors selected.&quot;;
    }
}
?&gt;

Keywords

HTML form multiple selection PHP define option tag

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