php从文本读入数据，处理结果再导入到文本

1，php从文本逐行读入数据，保存到数据组。使用fopen读取文本内容，逐行读取文本是$majorId = trim(fgets($rfile, 4096));。

$rfile = fopen("cate_id.txt", "r");
if ($rfile) {
    while (!feof($rfile)) {
        $majorId = trim(fgets($rfile, 4096));
        $majorName = CategoryNamespace::getMajorCategoryById($majorId);
        if(!$majorName){
            $majorName = CategoryNamespace::getMinorCategoryById($majorId);
        }
        $majorArray[$i]['id'] = $majorId;
        $majorArray[$i]['name'] = $majorName['name'];
        $i++;
    }
    fclose($rfile);
}

2，将数组数导出到文本，将数组内容拆分为字符串，将字符串导出到文本。

$majorStr = "majorId"."	"."majorName"."
";
$wfile = 'cate_result.txt';
foreach($majorArray as $major){
    $majorStr = $majorStr.trim($major['id'])."	".trim($major['name'])."
"; 

} 

file_put_contents($wfile, $majorStr);