PHP Sessions & Forms

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How can I rewrite this PHP code for POST[ 'phrase' ] == session[ 'phrase' ] ?

psuedo-code

//process_form.php

PHP
session_start()

IF POST SUBMIT
    IF empty text1 && empty text2 
  开发者_如何学JAVA      echo error msg, include HTML FORM

    ELSE IF empty radiobtn 
        echo error msg, include HTML FORM

    ELSE IF 
        isset POST[phrase] isstring POST[phrase] isset SESSION[phrase]
        strlen POST[phrase] > 0 strlen SESSION[phrase] > 0 
        POST[phrase] == SESSION[phrase]

        SQL INSERT

    ELSE
        echo POST[phrase]
        echo SESSION[phrase]

ELSE
    include HTML FORM
/PHP

FORM

PHP
PEAR CAPTCHA Settings ...
require_once 'Text/captcha.php'
/PHP

HTML
FORM METHOD POST process_form.php
    text1
    text2
    radio
    PHP echo [ img src= sha1(session_id()) . '.png?' . time() ] /PHP
    submit 
/HTML

You can use this for your captcha http://www.desarrolloweb.com/articulos/poner-captcha-en-3-pasos.html

Try to use implemented captcha instead of make yours, because is much more probably that these captchas are hard tested now.

I'm not sure if you put session_start() after some html code is right. Since i remenber you receive an error like "Headers already sent". Check that just for be sure

Cheers.

If you're willing to dive a bit into Zend Form (it's worth it), look into this answer's Default_Form_ReCaptcha. Here's how you might use it without the ZF stack:

$form = new Default_Form_ReCaptcha();
if (! empty($_POST)) {
    if ($form->isValid($_POST)) {
        // valid captcha was entered!
        $values = $form->getValues(); // all form values
    }
}
$formHtml = (string)$form;