PHP中的标签验证 - 允许输入字段为空？

问题描述：

The Script:

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>" >
    <input type="text" name="hashtag1" />
    <input type="text" name="hashtag2" />
    <input type="text" name="hashtag3" />
    <input type="text" name="hashtag4" />

    <input type="submit" name="submit" />
</form>

<?php

if(isset($_POST['submit'])){

    if(isset($_POST['hashtag1'])) {
        $hashtag1 = $_POST['hashtag1'];
    }
    if(isset($_POST['hashtag2'])){
        $hashtag2 = $_POST['hashtag2'];
    }
    if(isset($_POST['hashtag3'])){
        $hashtag3 = $_POST['hashtag3'];
    }
    if(isset($_POST['hashtag4'])){
        $hashtag4 = $_POST['hashtag4'];
    }

    $myarray = array($hashtag1, $hashtag2, $hashtag3, $hashtag4);

    for($i = 0; $i < count($myarray); $i++){

        if(!preg_match('/^(?=.{2,140}$)(#|\x{ff03}){1}([0-9_\p{L}]*[_\p{L}][0-9_\p{L}]*)$/u', $myarray[$i])){
            echo "Please check your hashtags!";
            exit;
        }

    }

    function array_has_dupes($array) {
        return count($array) !== count(array_unique($array));
    }

    if(array_has_dupes($myarray) == true){
        echo "Please make sure you do not have duplicate hashtags!";
        exit;
    }

    echo "Hello World!";

}

?>

When I leave one input field of those four input fields empty, then I get "Please check your hashtags." printed on screen.

My question is, how to modify the script so leaving one or more input fields empty is allowed?

I am using the "PHP Twitter Hashtag Validation Regex" from GitHub: link

脚本： strong> p>

   ＆lt; form method =“post”action =“＆lt;？php echo $ _SERVER ['PHP_SELF'];？＆gt;”  ＆gt; 
＆lt; input type =“text”name =“hashtag1”/＆gt; 
＆lt; input type =“text”name =“hashtag2”/＆gt; 
＆lt; input type =“text”name =  “hashtag3”/＆gt; 
＆lt; input type =“text”name =“hashtag4”/＆gt; 
 
＆lt; input type =“submit”name =“submit”/＆gt; 
＆lt; / form＆gt;  
 
＆lt;？php 
 
if（isset（$ _ POST ['submit']））{
 
 if（isset（$ _ POST ['hashtag1']））{
 $ hashtag1 = $ _POST [  'hashtag1']; 
} 
 if（isset（$ _ POST ['hashtag2']））{
 $ hashtag2 = $ _POST ['hashtag2']; 
} 
 if（isset（$ _ POST ['  hashtag3']））{
 $ hashtag3 = $ _POST ['hashtag3']; 
} 
 if（isset（$ _ POST ['hashtag4']））{
 $ hashtag4 = $ _POST ['hashtag4']  ; 
} 
 
 $ myarray = array（$ hashtag1，$ hashtag2，$ hashtag3，$ hashtag4）; 
 
 for（$ i = 0; $ i＆lt; count（$ myarray）; $ i ++）  {
 
 if（！preg_match（'/ ^（？=。{2,140} $）（＃| \ x {ff03}）{1}（[0-9_ \ p {L}] * [_ \ p  {L}] [0-9_ \ p {L}] *）$ / u'，$ myarray [$ i]））{
 echo“请检查你的主题标签！”; 
退出; 
} 
  
} 
 
函数array_has_dup  es（$ array）{
 return count（$ array）！== count（array_unique（$ array））; 
} 
 
 if（array_has_dupes（$ myarray）== true）{
 echo“Please 确保你没有重复的标签！“; 
 exit; 
} 
 
 echo”Hello World！“; 
 
} 
 
？＆gt; 
  code>  pre  > 
 
 当我将的那些 em>四个输入字段的输入字段留空时， 然后 em>  strong> 我在屏幕上打印“请检查您的主题标签。” em>。 p> 
 
 
我的问题是，如何修改脚本以便保留一个或多个  em>允许输入字段为空？ p> 
 
 
我正在使用GitHub的“PHP Twitter Hashtag Validation Regex”：链接  p> 
  div>

答

Use a variable to keep track of a valid hashtag, define it as false before your loop. If you find a valid hashtag, break out of your loop and set your variable to true.

After your loop, check the variable and if it's still false, display your error and exit:

$atLeastOne = false;
for($i = 0; $i < count($myarray); $i++){
    if(preg_match('/^(?=.{2,140}$)(#|\x{ff03}){1}([0-9_\p{L}]*[_\p{L}][0-9_\p{L}]*)$/u', $myarray[$i])){
        $atLeastOne = true;
        break;
    }
}
if(!$atLeastOne){
    echo "Please check your hashtags!";
    exit;
}

Note we are checking for a valid hashtag here, so you need to remove ! from within your if statement.

PHP中的标签验证 - 允许输入字段为空？

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