更新PHP中已检查的复选框 [英] Updating Already Checked Checkboxes in PHP

问题描述

假设我有一个用户选择的复选框列表。

 < input type =checkboxname =utility []id =utility []value = />< br /> 
< input type =checkboxname =utility []id =utility []value =Cable/> Cable< br / 
< input type =checkboxname =utility []id =utility []value =Electricity/> Electricity< br / 
 etc ... 
  

用户选择Water并将其添加到数据库。现在用户想更新列表：

 < input type =checkboxname =utility []id = utility []value =Waterchecked =checked/> Water< br /> 
< input type =checkboxname =utility []id =utility []value =Cable/> Cable< br / 
< input type =checkboxname =utility []id =utility []value =Electricity/> Electricity< br / 
 etc ... 
  

如何检查该实用程序是否已在PHP ？

解决方案

过去我做了些什么， p>

首先编译变量中的所有html，而不使用任何选中实例。

  $ boxes =''; 
 $ boxes。='< input type =checkboxname =utility []id =utility []value =Water/> Water< br / 
 $ boxes。='< input type =checkboxname =utility []id =utility []value =Cable/> Cable< br / 
 $ boxes。='< input type =checkboxname =utility []id =utility []value =Electricity/> Electricity< br / 
  

现在我循环检查字段数组。我也提供了一个示例数组。

  $ already_checked = array（'Water'，'Electricity'）; 
 
 foreach（$ already_checked as $ ac）{
 $ find ='value ='。$ ac。''; 
 $ replace = $ find。 'checked =checked'; 
 $ boxes = str_replace（$ find，$ replace，$ boxes）; 
} 
 
 echo $ boxes; 
  

let's say I have a list of checkboxes that the user selects.

<input type="checkbox" name="utility[]" id="utility[]" value="Water" />Water<br />
<input type="checkbox" name="utility[]" id="utility[]" value="Cable" />Cable<br />
<input type="checkbox" name="utility[]" id="utility[]" value="Electricity" />Electricity<br />
etc...

The user selected Water and it is added to the database. Now the user wants to update the list:

<input type="checkbox" name="utility[]" id="utility[]" value="Water" checked="checked"/>Water<br />
<input type="checkbox" name="utility[]" id="utility[]" value="Cable" />Cable<br />
<input type="checkbox" name="utility[]" id="utility[]" value="Electricity" />Electricity<br />
etc...

How can I check that the utility has already been checked in PHP?

解决方案

What I've done in the past, to save having hundreds of lines of bloat is this...

First compile all the html in a variable, without any "checked" instances.

$boxes = '';
$boxes .= '<input type="checkbox" name="utility[]" id="utility[]" value="Water" />Water<br />';
$boxes .= '<input type="checkbox" name="utility[]" id="utility[]" value="Cable" />Cable<br />';
$boxes .= '<input type="checkbox" name="utility[]" id="utility[]" value="Electricity" />Electricity<br />';

Now I loop over your array of fields to check. I've provided a sample array here too.

$already_checked = array('Water', 'Electricity');

foreach( $already_checked as $ac ) {
    $find = 'value="' . $ac . '"';
    $replace = $find . ' checked="checked"';
    $boxes = str_replace($find, $replace, $boxes);
}

echo $boxes;

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