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I am trying to use the following line of PHP code in one of my pages:

<input name="from" id="from" value="<?php echo $_GET['from'];?>" type="text" />

But instead of displaying an empty "from" input field (before typing anything into it), it displays <?php echo $_GET['from'];.

Am I missing something?

Clarification: I am entering this line of PHP code (in addition to some HTML) from the Admin's Edit Page (the HTML tab of course, not the Visual one).

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up vote 1 down vote accepted

You can't use PHP in the WordPress back-end editor. Maybe with a plugin you can, but not out of the box.

The easiest solution for this is creating a shortcode. Then you can use something like [input type="text" name"from"] in your editor.

function input_func( $atts ) {
    extract( shortcode_atts( array(
        'type' => 'text',
        'name' => '',
    ), $atts ) );

    return '<input name="' . $name . '" id="' . $name . '" value="' . (isset($_GET['from']) && $_GET['from'] ? $_GET['from'] : '') . '" type="' . $type . '" />';
add_shortcode( 'input', 'input_func' );

See http://codex.wordpress.org/Shortcode_API

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Aha! Well, I tried to avoid installing a "contact us" plugin, thinking that it simplest to isolate everything in one "contact us" page, but I guess I can't avoid either a plugin or a function. I have a simple theme based on twentyelven, containing a style.css only and I know how to edit it via Appearance > Editor, but how do I add there a function? – ef2011 Feb 1 '12 at 21:15
You can add functions in your functions.php theme file. So in your theme folder /themefolder/functions.php. If it isn't there you can create one yourself. – Rob Vermeer Feb 1 '12 at 21:22
OK, got it. I actually needed to create an empty functions.php via cPanel and only then it showed up in Appearance Editor (labeled "Theme Functions"). – ef2011 Feb 1 '12 at 21:28

Yes, post content are sanitized : all characters are converted to HTML equivalent and therefore no code could be executed. There is plugins that allows to execute code from post content, but it's bad security. You would better explore shortcodes (that create line of pseudo-code leading to execute real PHP code) or customizing theme files.

Shortcode http://codex.wordpress.org/Shortcode_API

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Are you trying to enter this form field/PHP output in the post content?

If so, then: no, you cannot do that. WordPress will strip both the form field AND will sanitize the PHP output.

You need to add such content functionally, i.e. directly in the template file, or else via action/filter hook callback.

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No, I am entering this line of PHP code (in addition to some HTML) from the Admin's Edit Page. Does this make a difference? – ef2011 Feb 1 '12 at 20:52
It does make a difference. Can you update your question to indicate 1) what file you are editing, and 2) post your actual code? – Chip Bennett Feb 1 '12 at 21:01

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