在开发WordPress插件时，无法修复已发送的标题使用Cookie吗？

Question

我正在尝试编写一个插件，用于注册一个特殊用途的窗口小部件表单，以便在CiviCRM中支付到期付款，但我无法在插件代码中使用cookie。我可以看到我的cookie放在插件形式的HTML代码之前，但我仍然收到标题已发送错误，所以我想知道如何解决它？

如果有人能帮助我解决这个问题，我将不胜感激。

这是我的完整插件代码：

<?php
/*
Plugin Name: CiviCRM Contribution Later Payment
Plugin URI: http://www.stackoverflow.com/cv/nicefellow1234
Description: This plugin helps in paying due contribution payments through a web form by entering Contribution ID.
Author: Umair Shah Yousafzai
Version: 1.0
Author URI: http://www.huntedhunter.com/mycv/
*/

function my_plugin_activate()
{
    // DO your activation task.

     /* $post_id = wp_insert_post( array(
                    'post_status' => 'publish',
                    'post_type' => 'page',
                    'post_title' => 'Contribution Later Payment Page',
                    'post_content' => 'Pay Your Contribution Payment Now.'
                ) );


    if ($post_id) 
    {
    error_log("New Page Added.");
    } */

}

    register_activation_hook(__FILE__,"my_plugin_activate");


    function cl_pay() {


        if ($_POST) {


        if ($_POST['cl_check_email']) {

            $contact_email = $_POST["contact_email"];

            global $wpdb;
            $sql = $wpdb->prepare("SELECT * FROM civicrm_contact WHERE sort_name = %s", $contact_email);
            $results = $wpdb->get_results($sql);
            $count = count($results);
            $contact_id = $results[0]->id;

            if (!$count > 0 ) {

                $sql = $wpdb->prepare("SELECT * FROM civicrm_email WHERE email = %s", $contact_email);
                $results = $wpdb->get_results($sql);
                $count = count($results);
                $contact_id = $results[0]->contact_id;
            }       

        }

        if ($_POST['cl_check_phone']) {

            $contact_phone = $_POST["contact_phone"];

            global $wpdb;
            $sql = $wpdb->prepare("SELECT * FROM civicrm_phone WHERE phone = %s", $contact_phone);
            $results = $wpdb->get_results($sql);
            $count = count($results);
            $contact_id = $results[0]->contact_id;

        }

        if ($_POST['cl_check_full_name']) {

            $first_name = $_POST["first_name"];
            $last_name = $_POST["last_name"];

            $full_name = $first_name." ".$last_name;

            global $wpdb;
            $sql = $wpdb->prepare("SELECT * FROM civicrm_contact WHERE display_name = %s", $full_name);
            $results = $wpdb->get_results($sql);
            $count = count($results);
            $contact_id = $results[0]->id;

            //echo "<pre>";
            //print_r($results);
            //echo "</pre>";

        }

        $sql = $wpdb->prepare("SELECT * FROM civicrm_contribution WHERE contact_id = %s", $contact_id);
        $results = $wpdb->get_results($sql);
        $count = count($results);
        $amount = $results[0]->total_amount;


        if ($count > 0) {
            setcookie("display_check", "none", time()+5);
        }

        if (isset($amount)) { setcookie("display_amount", "block", time()+5); }

        }

        ?>

<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,300,300italic,400italic,600' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>

<script type="text/javascript">
$(document).ready(function () {
   $('#choice').change(function () {
      if ( this.value === 'option_1' ) {
          $("#option_1").show("slow");
          $("#option_2").hide("slow");
          $("#option_3").hide("slow");
      }
      else if ( this.value === 'option_2' ) {
        $("#option_2").show("slow");
        $("#option_1").hide("slow");
        $("#option_3").hide("slow");
      }
        else if ( this.value === 'option_3' ) {
            $("#option_3").show("slow");
            $("#option_1").hide("slow");
            $("#option_2").hide("slow");
      } else if ( this.value === 'not_specified' ) {
        $("#option_1").hide("slow");
        $("#option_2").hide("slow");
        $("#option_3").hide("slow");
      }
   });
});


</script>


<style>

html {
    height: 100%;
    /*Image only BG fallback*/
    background: url('http://thecodeplayer.com/uploads/media/gs.png');
    /*background = gradient + image pattern combo*/
    background: 
        linear-gradient(rgba(196, 102, 0, 0.2), rgba(155, 89, 182, 0.2)), 
        url('http://thecodeplayer.com/uploads/media/gs.png');
}

body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, 
pre, form, fieldset, input, textarea, p, blockquote, th, td { 
  padding:0;
  margin:0;}

fieldset, img {border:0}

ol, ul, li {list-style:none}

:focus {outline:none}

body,
input,
textarea,
select {
  font-family: 'Open Sans', sans-serif;
  font-size: 16px;
  color: #4c4c4c;
}

p {
  font-size: 12px;
  width: 150px;
  display: inline-block;
  margin-left: 18px;
}
h1.testboxh1 {
  font-size: 32px;
  font-weight: 300;
  color: #4c4c4c;
  text-align: center;
  padding-top: 10px;
  margin-bottom: 10px;
}

html{
  background-color: #ffffff;
}

.testbox {
  margin: 20px auto;
  width: 455px; 
  -webkit-border-radius: 8px/7px; 
  -moz-border-radius: 8px/7px; 
  border-radius: 8px/7px; 
  background-color: #ebebeb; 
  -webkit-box-shadow: 1px 2px 5px rgba(0,0,0,.31); 
  -moz-box-shadow: 1px 2px 5px rgba(0,0,0,.31); 
  box-shadow: 1px 2px 5px rgba(0,0,0,.31); 
  border: solid 1px #cbc9c9;
}

input[type=radio] {
  visibility: hidden;
}

form{
  margin: 0 30px;
text-align:center;
}

label.radio {
    cursor: pointer;
  text-indent: 35px;
  overflow: visible;
  display: inline-block;
  position: relative;
  margin-bottom: 15px;
}

label.radio:before {
  background: #3a57af;
  content:'';
  position: absolute;
  top:2px;
  left: 0;
  width: 20px;
  height: 20px;
  border-radius: 100%;
}

label.radio:after {
    opacity: 0;
    content: '';
    position: absolute;
    width: 0.5em;
    height: 0.30em;
    background: transparent;
    top: 7.5px;
    left: 4.5px;
    border: 3px solid #ffffff;
    border-top: none;
    border-right: none;

    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    transform: rotate(-45deg);
}

input[type=radio]:checked + label:after {
    opacity: 1;
}

hr{
  color: #a9a9a9;
}

input[type=text],input[type=password],select {
text-align:center;
  width: 200px; 
  height: 39px; 
  -webkit-border-radius: 0px 4px 4px 0px/5px 5px 4px 4px; 
  -moz-border-radius: 0px 4px 4px 0px/0px 0px 4px 4px; 
  border-radius: 0px 4px 4px 0px/5px 5px 4px 4px; 
  background-color: #fff; 
  -webkit-box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
  -moz-box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
  box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
  border: solid 1px #cbc9c9;
  margin-left: -5px;
  margin-top: 13px; 
  padding-left: 10px;
}

input[type=password]{
  margin-bottom: 25px;
}

#icon {
  width: 30px;
height:20px;
  background-color: #3a57af;
  padding: 8px 0px 8px 15px;
  margin-left: 15px;
  margin-top: -10px;
  -webkit-border-radius: 4px 0px 0px 4px; 
  -moz-border-radius: 4px 0px 0px 4px; 
  border-radius: 4px 0px 0px 4px;
  color: white;
  -webkit-box-shadow: 1px 2px 5px rgba(0,0,0,.09);
  -moz-box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
  box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
  border: solid 0px #cbc9c9;
}

.gender {
  margin-left: 30px;
  margin-bottom: 30px;
}

.accounttype{
  margin-left: 8px;
  margin-top: 20px;
}

input.button {
text-align:center;
  font-size: 14px;
  font-weight: 600;
  color: white;
padding : 8px 30px 8px 30px;
  text-decoration: none;
  -webkit-border-radius: 5px; 
  -moz-border-radius: 5px; 
  border-radius: 5px; 
  background-color: #3a57af; 
  -webkit-box-shadow: 0 3px rgba(58,87,175,.75); 
  -moz-box-shadow: 0 3px rgba(58,87,175,.75); 
  box-shadow: 0 3px rgba(58,87,175,.75);
  transition: all 0.1s linear 0s; 


}

input.button:hover {
  top: 3px;
  background-color:#2e458b;
  -webkit-box-shadow: none; 
  -moz-box-shadow: none; 
  box-shadow: none;

}


</style>

</br></br></br></br>
<div class="testbox">
  <h1 class="testboxh1">Pay Due Contribution Pay</h1>

<div class="pay_check" style="display:<?php if (!isset($_COOKIE['display_check'])) {echo "block";} else {echo $_COOKIE['display_check']; }?>;">
  <form action="" method="post" >
      <hr>
    <!---<div class="accounttype">
      <input type="radio" value="None" id="radioOne" name="account" checked/>
      <label for="radioOne" class="radio" chec>Personal</label>
      <input type="radio" value="None" id="radioTwo" name="account" />
      <label for="radioTwo" class="radio">Company</label>
    </div> --->
    <center><h3>::Search By::</h3></center>
      <select name="choice" id="choice">
       </br>
    <option value="not_specified">Not Specified</option>
  <option value="option_1">Contact Email</option>
  <option value="option_2">Contact Phone</option>
  <option value="option_3">Full Name</option>
  </select>
    <div id="option_1" style="display:none;">
     <hr>
    <center><h3 style="padding-top: 10px;">::Enter Contact Email::</h3></center>
     <form action="" method="post" >
    <input type="text" name="contact_email" placeholder="Contact Email" style="width:250px;"></br>
     </br> <input type="submit" name="cl_check_email" class="button" value="Check">
     </form>
     </br><hr>
    </div>
    <div id="option_2" style="display:none;">
     <hr>
    <center><h3 style="padding-top: 10px;">::Enter Contact Phone No::</h3></center>
     <form action="" method="post" >
<input type="text" name="contact_phone" placeholder="Contact Phone No" style="width:250px;"> </br>
 </br> <input type="submit" name="cl_check_phone" class="button" value="Check">
     </form>
     </br><hr>
    </div>
      <div id="option_3" style="display:none;">
      <hr>
       <form action="" method="post" >
    <center><h3 style="padding-top: 10px;">::Enter Full Name::</h3></center>
    <input type="text" name="first_name" placeholder="First Name">
    <input type="text" name="last_name" placeholder="Last Name"></br>
     </br> <input type="submit" name="cl_check_full_name" class="button" value="Check">
     </form>
     </br><hr>
    </div>

    </br>

<!-- <label id="icon" for="cl_id"><i class="fa fa-tag "  style="padding-right: 13px;"></i></label>
  <input type="text" name="cl_id" id="cl_id" placeholder="Contribution ID" required/></br> -->

</br></br>

</div>

<div class="cl_pay" style="display:<?php if (!isset($_COOKIE['display_amount'])) {echo "none";} else {echo $_COOKIE['display_amount']; }?>;">
  <form action="" method="post" >
      <hr>
  <label id="icon" for="cl_pay" style="border-radius:4px;padding-right: 100px;padding-left: 100px;background-color:#422252;"><i class="fa fa-usd " style="">
   <strong><?php echo $amount; ?></strong></i></label>
</br>
    <hr> <input type="submit" name="cl_pay" class="button" value="Pay">
</br></br>
  </form>
</div>
</div>

        <?php 



    }

add_shortcode("cl-pay", "cl_pay");



function my_plugin_deactivate()
{
    // DO your activation task.
    error_log("My Plugin Got Deactivated.");
}

register_deactivation_hook(__FILE__,"my_plugin_deactivate");

?>

我得到的错误是：

Warning: Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\civicrm_development\wp-includes\class.wp-scripts.php:180) in D:\xampp\htdocs\civicrm_development\wp-content\plugins\civicrm_later_contribution_pay.php on line 97

Warning: Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\civicrm_development\wp-includes\class.wp-scripts.php:180) in D:\xampp\htdocs\civicrm_development\wp-content\plugins\civicrm_later_contribution_pay.php on line 100

除了Line 97＆amp; 100我有以下代码：

97：

if ($count > 0) {
            setcookie("display_check", "none", time()+5);
}

100：

if (isset($amount)) { setcookie("display_amount", "block", time()+5); }

}

Answer 1

当我使用新的PHP服务器时，我遇到了同样的问题。你需要做两件事才能解决这个问题。

1. 在发送标头之前，永远不要允许任何HTML转义。 （非常艰难）
2. 打开输出缓冲。 （最好又简单的方法）

要启用输出缓冲，您需要在php.ini中设置：

output_buffering On

或者在您的计划中：

ini_set("output_buffering", 1); // OR
ob_start();