如何在PHP中的多行文本文件中删除多个白色空间

Question

我有一个文本文件，其中包含每个项目之间的" n"和空格分隔的行。项目被一个或多个空白空间分开。但是，每条线之间的元素之间的空白间距是一致的。

FRUIT   WATER   GRE  LRG   0003 050
FRUIT   BANAN   YEL  MED   0017 010
FRUIT   STRAW   RED  SML   0005 005
FRUIT   LEMON   YEL  SML   0024 005
VEGIE   REDPE   RED  MED   0008 001
VEGIE   GRENP   GRE  MED   0009 001
BOX   RED     006 012 018
BOX   YEL     010 020 030
BOX   GRE     003 006 009
PERSON      JOHN  TALL  STRG
PERSON      JIMM  MEDM  WEAK
PERSON      DAVD  MEDM  STRG

我试图用PHP解析此文件。以下代码产生一个带有许多白色空间的数组。

if(file_exists($filename)) {
        $filecontents = file_get_contents($filename);
        $lines = explode("n", $filecontents);
        foreach ($lines as $line) {
        $exploded = explode(" ", $line);
        if (sizeof($exploded) >= 5 and $exploded[0] == 'FRUIT') $array[] = array(
            'type' => $exploded[1],
            'color' => $exploded[2],
            'size' => $exploded[3],
            'qty' => $exploded[4],
            'weight' => $exploded[5]
            );
        if (sizeof($exploded) >=5 and $exploded[0] == 'VEGIE') $array[] = array(
            'type' => $exploded[1],
            'color' => $exploded[2],
            'size' => $exploded[3],
            'qty' => $exploded[4],
            'weight' => $exploded[5]
            );
        if (sizeof($exploded) >= 5 and $exploded[0] == 'BOX') $array[] = array(
            'color' => $exploded [1],
            'largefit' => $exploded[2],
            'medfit' => $exploded[3],
            'smallfit' => $exploded[4]
            );
        if (sizeof($exploded) >= 4 and $exploded[0] == 'PERSON') $array[] = array (
            'name' => $exploded[1],
            'build'=> $exploded[2],
            'strength' => $exploded[3]
            );
        }
    }
print_r($array);
?>

Answer 1

简单的答案，在保存之前，请在所有值上使用trim()：

'type' => trim($exploded[1]),

但是，这项工作是您可以通过正则表达式更有效地做的事情。还要注意file()命令将文件自动读取到数组！

<?php
if(file_exists($filename)) {
    $array = [];
    $lines = file($filename);
    foreach ($lines as $line) {
        if (!preg_match("/(w+)s+(w+)s+(w+)s+(w+)(?:(?:s+(w+))?s+(w+))?/", $line, $matches)) {
            continue;
        }
        switch ($matches[1]) {
            case "FRUIT":
            case "VEGGIE":
                list($foo, $bar, $type, $color, $size, $qty, $weight) = $matches;
                $array[] = compact("type", "color", "size", "qty", "weight");
                break;
            case "BOX":
                list($foo, $bar, $color, $largefit, $medfit, $smallfit) = $matches;
                $array[] = compact("color", "largefit", "medfit", "smallfit");
                break;
            case "PERSON":
                list($foo, $bar, $name, $build, $strength) = $matches;
                $array[] = compact("name", "build", "strength");
                break;
        }
    }
}
print_r($array);

compact()命令与extract()相反；也就是说，它采取了参数，并将这些名称的变量放入关联数组中。