Question

我有一个这样的文本文件：

unfinished  unfinished  17876   open        peters      Current/17876 - 
unfinished  unfinished  17830   new         peters      Current/17830 - 
unfinished  unfinished  17810   new         jongr       Current/17810 -

我想列出第5栏中的所有项目。但是如果有重复，我不希望它被列出两次。我到目前为止的代码是：

<select>
<?php
ini_set('display_errors',"1");

$lines = file('C://projectlist/project-list.txt');

foreach ($lines as $line){
    $parts = explode('  ', $line);

    echo "<option>{$parts[4]}</option>";
}



?>
</select>

但是，这只列出了下拉框中的所有名称。

Answer 1

尝试使用array_unique(); 一个例子：

$my_array = array_unique($my_array);

或使用帖子中的细节的其他解决方案：

<?php
    ini_set('display_errors',"1");

    $select = '<select>';

    $lines = file('project-list.txt');
    $fifth_column = array();
    foreach ($lines as $line){
        $parts = preg_split('/\s+/', $line);
        $count = 0;
        foreach ($parts as $partVal){
            if ((in_array($partVal, $fifth_column) == FALSE) && $count == 4){
                $fifth_column[] = $partVal;
            }
            $count++;
        }
    }

    foreach($fifth_column as $value){
        $select .= "<option value='".$value."'>".$value."</option>";
    }

    $select .= '</select>';

    echo $select;
?>

Answer 2

这是一个不错的小功能。你可以阅读它here。

以下是一个例子：http://3v4l.org/uGgU4

function doopScooper($dataArray, $uniqueKeys){

    // store the the previously checked sub-arrays here
    $checked = array();

    //loop through the array
    foreach($dataArray as $k=>$row){

        // this will become the sub array that needs to be checked
        $checkArray = array();

        //create the sub array for comparison
        foreach($uniqueKeys as $key)
            $checkArray[$key] = isset($row[$key]) ? $row[$key] : NULL;

        // convert sub array to string for easy comparison
        $checkArray = json_encode($checkArray);

        // check for duplicates, if found delete, else add to the checking array
        if(in_array($checkArray, $checked)) unset($dataArray[$k]);
        else $checked[] = $checkArray;

    }
    return $dataArray;
}

$lines = "unfinished  unfinished  17876   open        peters      Current/17876 - 
unfinished  unfinished  17830   new         peters      Current/17830 - 
unfinished  unfinished  17810   new         jongr       Current/17810 -";

$lines = explode("\n",$lines);
$parts=[];
foreach ($lines as $line) $parts[] = explode('  ', $line);

//remove duplicates from the 7th column
$lines = doopScooper($parts, array(7));

foreach ($lines as $line) echo "<option>{$parts[4]}</option>";

从PHP中的dropdownlist中删除重复项

2 个答案: