我是编程和php的初学者。我试图了解这种形式是如何工作的。通常，当单击表单中的提交按钮时，该操作将分配给一些 filename.php 以通过 post 或 get 方法进行处理。但我不知道如何处理此表单（我可以理解表单字段正在使用其他 php 文件中的少数函数）特别是我想了解这一点
<input type="button" name="goback" class="btn_orange" value="<?php _e( 'Go back', APP_TD);?>" onclick="history.back()" />
<input type="submit" name="step2" id="step2" class="btn_orange" value="<?php _e( 'Continue ››', APP_TD ); ?>" />
这是来自 wordpress 主题的文件之一，我正在复制包含表单的文件的完整代码。
global $current_user, $wpdb;
$error_msg = false;
// check to see if there are images included
// then valid the image extensions
if ( ! empty( $_FILES['image'] ) )
$error_msg = cp_validate_image();
// check to see is ad pack specified for fixed price option
if ( $cp_options->price_scheme == 'single' && cp_payments_is_enabled() && ! isset( $_POST['ad_pack_id'] ) )
$error_msg[] = __( 'Error: no ad pack has been defined. Please contact the site administrator.', APP_TD );
$error_msg = apply_filters( 'cp_listing_validate_fields', $error_msg );
// images are valid
if ( ! $error_msg ) {
// create the array that will hold all the post values
$postvals = array();
// delete any images checked
if ( ! empty( $_POST['image'] ) )
cp_delete_image();
// update the image alt text
if ( ! empty( $_POST['attachments'] ) )
cp_update_alt_text();
// upload the images and put into the new ad array
if ( ! empty( $_FILES['image'] ) )
$postvals = cp_process_new_image();
if ( ! empty( $_POST['app_attach_id'] ) )
$postvals['app_attach_id'] = $_POST['app_attach_id'];
if ( ! empty( $_POST['app_attach_title'] ) )
$postvals['app_attach_title'] = $_POST['app_attach_title'];
// put all the posted form values into an array
foreach ( $_POST as $key => $value ) {
if ( ! is_array( $_POST[ $key ] ) )
$postvals[ $key ] = appthemes_clean( $value );
else
$postvals[ $key ] = array_map( 'appthemes_clean', $value );
}
// keep only numeric, commas or decimal values
$postvals['cp_price'] = ( empty( $_POST['cp_price'] ) ) ? '' : appthemes_clean_price( $_POST['cp_price'] );
if ( isset( $postvals['cp_currency'] ) && ! empty( $postvals['cp_currency'] ) )
$price_curr = $postvals['cp_currency'];
else
$price_curr = $cp_options->curr_symbol;
// keep only values and insert/strip commas if needed
if ( ! empty( $_POST['tags_input'] ) ) {
$postvals['tags_input'] = appthemes_clean_tags( $_POST['tags_input'] );
$_POST['tags_input'] = $postvals['tags_input'];
}
// store the user IP address, ID for later
$postvals['cp_sys_userIP'] = appthemes_get_ip();
$postvals['user_id'] = $current_user->ID;
$ad_pack_id = ( isset( $_POST['ad_pack_id'] ) ) ? appthemes_numbers_only( $_POST['ad_pack_id'] ) : false;
if ( $ad_pack_id )
$postvals['pack_duration'] = cp_get_ad_pack_length( $ad_pack_id );
$coupon = false;
if ( cp_payments_is_enabled() ) {
// see if the featured ad checkbox has been checked
if ( isset( $_POST['featured_ad'] ) ) {
$postvals['featured_ad'] = $_POST['featured_ad'];
// get the featured ad price into the array
$postvals['cp_sys_feat_price'] = $cp_options->sys_feat_price;
}
// calculate the ad listing fee and put into a variable
$postvals['cp_sys_ad_listing_fee'] = cp_ad_listing_fee($_POST['cat'], $ad_pack_id, $postvals['cp_price'], $price_curr);
// calculate the total cost of the ad
if ( isset( $postvals['cp_sys_feat_price'] ) )
$postvals['cp_sys_total_ad_cost'] = cp_calc_ad_cost($_POST['cat'], $ad_pack_id, $postvals['cp_sys_feat_price'], $postvals['cp_price'], $coupon, $price_curr);
else
$postvals['cp_sys_total_ad_cost'] = cp_calc_ad_cost($_POST['cat'], $ad_pack_id, 0, $postvals['cp_price'], $coupon, $price_curr);
//UPDATE TOTAL BASED ON MEMBERSHIP
//check for current users active membership pack and that its not expired
if ( ! empty( $current_user->active_membership_pack ) && appthemes_days_between_dates( $current_user->membership_expires ) > 0 ) {
$postvals['cp_membership_pack'] = get_pack( $current_user->active_membership_pack );
//update the total cost based on the membership pack ID and current total cost
$postvals['cp_sys_total_ad_cost'] = get_pack_benefit( $postvals['cp_membership_pack'], $postvals['cp_sys_total_ad_cost'] );
//add featured cost to static pack type
if ( isset( $postvals['cp_sys_feat_price'] ) && in_array( $postvals['cp_membership_pack']->pack_type, array( 'required_static', 'static' ) ) )
$postvals['cp_sys_total_ad_cost'] += $postvals['cp_sys_feat_price'];
}
}
// prevent from minus prices if bigger discount applied
if ( ! isset( $postvals['cp_sys_total_ad_cost'] ) || $postvals['cp_sys_total_ad_cost'] < 0 )
$postvals['cp_sys_total_ad_cost'] = 0;
// now put the array containing all the post values into the database
// instead of passing hidden values which are easy to hack and so we
// can also retrieve it on the next step
$option_name = 'cp_' . $postvals['oid'];
update_option( $option_name, $postvals );
?>
<div id="step2"></div>
<h2 class="dotted"><?php _e( 'Review Your Listing', APP_TD ); ?></h2>
<img src="<?php echo appthemes_locate_template_uri('images/step2.gif'); ?>" alt="" class="stepimg" />
<?php do_action( 'appthemes_notices' ); ?>
<form name="mainform" id="mainform" class="form_step" action="" method="post" enctype="multipart/form-data">
<ol>
<?php
// pass in the form post array and show the ad summary based on the formid
echo cp_show_review( $postvals );
?>
</ol>
<div class="pad10"></div>
<div class="license"><?php cp_display_message( 'terms_of_use' ); ?></div>
<div class="clr"></div>
<p class="terms">
<?php _e( 'By clicking the proceed button below, you agree to our terms and conditions.', APP_TD ); ?>
<br />
<?php _e( 'Your IP address has been logged for security purposes:', APP_TD ); ?> <?php echo $postvals['cp_sys_userIP']; ?>
</p>
<p class="btn2">
<input type="button" name="goback" class="btn_orange" value="<?php _e( 'Go back', APP_TD ); ?>" onclick="history.back()" />
<input type="submit" name="step2" id="step2" class="btn_orange" value="<?php _e( 'Continue ››', APP_TD ); ?>" />
</p>
<input type="hidden" id="oid" name="oid" value="<?php echo $postvals['oid']; ?>" />
</form>
<div class="clear"></div>
<?php
} else {
?>
<h2 class="dotted"><?php _e( 'An Error Has Occurred', APP_TD ); ?></h2>
<div class="thankyou">
<p><?php echo appthemes_error_msg( $error_msg ); ?></p>
<input type="button" name="goback" class="btn_orange" value="‹‹ <?php _e( 'Go Back', APP_TD ); ?>" onclick="history.back()" />
</div>
<?php
}
?>