April 24, 2012
What's wrong? I am receiving error msg: Invalid arguments passed in eval()
Question by user6919
I write down my php code:
<?php
// 已有指定 material, 顯示 material 資訊
if (strlen($m_id) > 0) {
// 此 material 屬於哪些 mgroup
$group_info = $mUtil->groupInfo($m_id);
$group_names = array();
foreach ($group_info as $mg_id => $row) {
if (!$row["not_in_group"]) {
$group_names[] = $row["mg_name"];
}
}
}
?>
<table width="100%">
<tr>
<th colspan="2"><?php echo $m_name; ?></th>
</tr>
<tr class="odd">
<th>Formula</th>
<td width="80%"><?php echo $formula; ?></td>
</tr>
<tr class="odd">
<th>Alias</th>
<td><?php echo $alias; ?></td>
</tr>
<tr class="odd">
<th>In groups</th>
<!-- join() == implode() -->
<td><?php echo join($group_names, ", "); ?></td>
</tr>
</table><br /><br />
but I get these error message:
Notice: Undefined variable: group_names in eval() (line 97 of D:xampphtdocsdrupalmodulesphpphp.module(80) : eval()'d code).
Warning: join() [function.join]: Invalid arguments passed in eval() (line 97 of D:xampphtdocsdrupalmodulesphpphp.module(80) : eval()'d code).
Notice: Undefined variable: group_names in eval() (line 97 of D:xampphtdocsdrupalmodulesphpphp.module(80) : eval()'d code).
Warning: join() [function.join]: Invalid arguments passed in eval() (line 97 of D:xampphtdocsdrupalmodulesphpphp.module(80) : eval()'d code).
Anyone can help me? Thanks a lot….
Answer by Starx
The undefined errors are due to variables like $group_names only being defined once
if (strlen($m_id) > 0) { ... } //condition is true.
Make sure the variable you are using are instantiated before using them.
Using isset($instancename) can be one of the ways to deal with this.
Example:
if(!isset($group_names)) $group_names = array();
// ^ if $group_names is not found then at least initialize it as an empty array
// so that the rest of the script can go easy
Also, join() needs a glue to join the array, which is not in correct order.
<?php echo join(", ", $group_names); ?>
NOTE: The use of eval() has to be however be discouraged
