使用不同的名稱驗證多個複選框以確保至少有一個被選中

Question

我有一個帶有不同名稱的多個複選框（不是組）的不同名稱的PHP表單，它們在提交時發送到數組並通過電子郵件發送。我遇到的問題是我正在尋找一種方法來驗證提交時是否至少選中了其中一​​個複選框。我知道如何做一個複選框或做複選框組，但不是這個。如何才能做到這一點？如果有人能指引我正確的方向，我將不勝感激。

我正在添加我所問的表單部分的代碼。

<form action="" method="post"> 



    <fieldset> 
     <legend> 
      Please Select at least one: 
     </legend> 
<p class="style5">Type of Alleged Occurrence:<input name="occurrence" type="hidden" value="<?php { print 'Type of Occurrence'; }?>"></p> 
          <font size="-1" face="Arial, Helvetica, sans-serif" align="left"> 
          <table style="width: 100%"> 
           <tr><td style="width: 21%; height: 57px;"><strong> Disruption:</strong><br><input name="obscene" type="checkbox" value="Obscene Language" <?php if(isset($_POST['obscene'])) echo "checked"; ?>><label id="obscene">Obscene language </label> 
            </td><td style="width: 33%; height: 57px;"> 
            <strong> Sexual Harassment:</strong><br><input name="sexharass" type="checkbox" value="Physical" <?php if(isset($_POST['sexharass'])) echo "checked"; ?> ><label id="sexharass">Physical </label>&nbsp;<span lang="en-us">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            </span>&nbsp;<input name="sexharass" type="checkbox" value="Verbal" <?php if(isset($_POST['sexharass'])) echo "checked"; ?> ><label id="sexharass2">Verbal </label> 

<td style="width: 21%; height: 57px;"><strong> Altercation:</strong> 
<br><input name="altercation1" type="checkbox" value="Verbal" <?php if(isset($_POST['altercation1'])) echo "checked"; ?>><label id="Label3">Verbal</label> 

<input name="altercation1" type="checkbox" value="Physical" <?php if(isset($_POST['altercation1'])) echo "checked"; ?> ><label id="Label4">Physical</label> <br> 



            <td style="width: 33%; height: 57px;"><strong>Involved in altercation:</strong><br> 



<input name="altercation2" type="checkbox" value="student/student" <?php if(isset($_POST['altercation2'])) echo "checked"; ?>><label id="Label3">Student/Student </label> 


<input name="altercation2" type="checkbox" value="student/faculty-staff" <?php if(isset($_POST['altercation2'])) echo "checked"; ?>><label id="Label4">Student/Faculty-Staff </label> 

<tr><td><strong> Theft/ Damage to Property:</strong><br><input name="property" type="checkbox" value="DACC" <?php if(isset($_POST['property'])) echo "checked"; ?> ><label id="property">DACC </label>&nbsp;<span lang="en-us">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font size="-1" face="Arial, Helvetica, sans-serif" align="left"><input name="property1" type="checkbox" value="Self" <?php if(isset($_POST['property'])) echo "checked"; ?> ><label id="property3">Self </label> 



</font>&nbsp;&nbsp;<br> 
            </span><input name="property" type="checkbox" value="Faculty/Staff" <?php if(isset($_POST['property'])) echo "checked"; ?> ><label id="property2">Faculty/Staff </label> 




    </td> 
    <td><strong> Threat of Harm to Self or Others:</strong><br><input name="harm" type="checkbox" value="Student/Student" <?php if(isset($_POST['harm'])) echo "checked"; ?> > 
<label id="harm">Student/Student </label>&nbsp;<span lang="en-us">&nbsp;&nbsp;&nbsp;<font size="-1" face="Arial, Helvetica, sans-serif" align="left"><input name="harm2" type="checkbox" value="Self" <?php if(isset($_POST['harm'])) echo "checked"; ?> ><label id="property2">Self </label> 



</font><br> 
            </span> 
      <font size="-1" face="Arial, Helvetica, sans-serif" align="left"> 
          <span lang="en-us"><input name="harm1" type="checkbox" value="Student/Faculty-Staff" <?php if(isset($_POST['harm'])) echo "checked"; ?> ><label id="harm3">Student/Faculty-Staff </label> 



      &nbsp;&nbsp;</span></font></td></tr> 


<tr><td><strong> Drugs/Alcohol:</strong><br><input name="drugs" type="checkbox" value="Under the Influence" <?php if(isset($_POST['drugs'])) echo "checked"; ?> ><label id="drugs">Under the Influence </label>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font size="-1" face="Arial, Helvetica, sans-serif" align="left"><input name="drugs" type="checkbox" value="Possession" <?php if(isset($_POST['drugs'])) echo "checked"; ?> ><label id="drugs2">Possession </label> 



</font> 




    </td><td><strong> Other Occurrences:</strong><br><input name="other" type="checkbox" value="Student/Student" <?php if(isset($_POST['other'])) echo "checked"; ?> ><label id="other">Trespassing </label>&nbsp;<span lang="en-us">&nbsp;&nbsp;&nbsp;<font size="-1" face="Arial, Helvetica, sans-serif" align="left"><input name="other" type="checkbox" value="Other" <?php if(isset($_POST['other'])) echo "checked"; ?> ><label id="other2">Other </label> 



</font><br> 
            </span> 
      </td></tr>    </table><p></p> 

Answer 1

根據您的形式結構，你將需要使用isset()檢查。假設你是不張貼作爲數組（<input type='checkbox' name='cb[]' value='x' /><input type='checkbox' name='cb[]' value='x' />...etc，你可以這樣來做：

<form method='post'...> 
<input type='checkbox' name='cb1' value='x' /> 
<input type='checkbox' name='cb2' value='x' /> 
</form> 

驗證與...

$require_one_of = array('cb1','cb2',...etc); //names of posted checkboxes 
$one_set=false; 
foreach($require_one_of as $key){ 
    if(isset($_POST[$key])){ 
     $one_set=true; 
     break; 
    } 
} 
if(!$one_set){ 
    //error handling 
} 

如果要發佈一個數組，然後你可以只檢查陣列設置：

<form method='post'...> 
<input type='checkbox' name='cb[]' value='x' /> 
<input type='checkbox' name='cb[]' value='x' /> 
</form> 

驗證與

<?php 
if(!isset($_POST['cb'])){ 
    //error handling 
} 
?> 

注：我在此假設您正在使用後作爲表單提交方法