Foreach给出未定义的变量错误

Question

Bare in mind that it's late where I am so this may just be a very simple solution that I am overlooking.

I have this foreach statement:

  <? foreach ($entrees as $entree) { ?>
       <li>
           <span class="food-name">
               <?=$entree['name']?>
           </span>
       </li>
  <?}?>

That gives an Undefined variable error for $entree.

 A PHP Error was encountered

 Severity: Notice

 Message: Undefined variable: entree

 Filename: views/welcome_message.php

 Line Number: 9

I tried print_r($entrees); and the result was

 Array ( [0] => Array ( [name] => Lamb [description] => A small leg of lamb ) [1] => Array ( [name] => Ham [description] => Large thing of ham ) ) 1

Again, this may be something stupid simple but I've been trying to 30 min and can't get it to work for the life of me. Thanks in advance for the help.

Answer 1

You need to check to see if the entry name is set in your multidimensional array. Here is the long version because I was unaware of the short_open_tags option in PHP.

Code

<?
$entrees = array();
$entrees[0]['name']="Lamb";
$entrees[0]['description'] ="A small leg of lamb";
$entrees[1]['name']="Ham";
$entrees[1]['description'] ="Large thing of ham";

echo "<ul>\n";
foreach ($entrees as $entree) { 
 if(!empty($entree['name'])){
   echo "<li>";
   echo "<span class=\"food-name\">";
   echo $entree['name'];
   echo "</span>";
   echo "</li>\n";
 }
}
echo "</ul>";

?>

Output

<ul>
<li><span class="food-name">Lamb</span></li>
<li><span class="food-name">Ham</span></li>
</ul>

Update Learned something new thanks to @Arjan - the original code you had with the [short_open_tags][1] should also work with the if statement provided they are enabled in your build. In my testing they threw an error as my test machine uses an older build of PHP. After rebuilding they do work by default.

<?=$entree['name']?>

According to the manual in this usage the = sign means echo() and is enabled by default in PHP 5.4.1. Upon searching through Google because their searches use the operators differently I was unable to find a link since I did not know the name for the usage. If you're programming with a team of developers make sure to use the same agreed upon tag styles as the rest of the team.

Answer 2

You need to set short_open_tag to On in php.ini. That fixed it for me with no additional code.

Answer 3

Use like ..

   <?   
     if(isset($entrees)) {
     foreach ($entrees as $entree) { ?>
   <li>
       <span class="food-name">
           <?=$entree['name']?>
       </span>
   </li>
      <?} } 
       else { echo 'Any thing You want';
      }
     ?>

Answer 4

try this

<?php 
   if(isset($entrees) && $entrees != NULL){
      foreach($entrees as $entree => $arrData){?>
        <li>
          <span class="food-name">
            <?php echo $arrData['name'] ?>
          </span>
        </li>         
     <?}
   }?>