Question

我有一个字符串

p, br, a[href,title], ul, li, em, strong

我想将其转换为数组。我尝试使用explode，但它没有按预期工作：

$tags = explode(',', $tags);

以上代码输出：

 array (
      0 => 'p',
      1 => ' br',
      2 => ' a[href',
      3 => 'title]',
      4 => ' ul',
      5 => ' li',
      6 => ' em',
      7 => ' strong'
 )

我该怎么做才能得到这样的结果：

array (
  0 => 'p',
  1 => ' br',
  2 => ' a' => array('href', 'title'),
  4 => ' ul',
  5 => ' li',
  6 => ' em',
  7 => ' strong'
)

Answer 1

如果您确定CSV始终具有架构逗号和空格，您仍然可以使用explode()添加空格：

$tags = explode(', ', $tags);

第二个选项是对每个值使用trim()：

foreach ($tags as &$tag) {
    $tag = trim($tag);
}

unset($tag);

如果您从文件中读取CSV，最佳解决方案将使用fgetcsv() function。

Answer 2

试试这个：

$ar = explode(", ", $s);

for ($i = 0; $i < count($ar); $i++) {
    if (strpos($ar[$i], ",")) { //if is array formatted
        $begin = strpos($ar[$i], "[");
        $name = substr($ar[$i], 0, $begin);
        $content = substr(substr($ar[$i], $begin + 1), 0, -1);
        $newAr = explode(",", $content);
        unset($ar[$i]);
        $ar[$i][$name] = $newAr;
    }
}
$ar = array_values($ar);

给定$s = "p, br, a[href,title], ul, li, em, strong";，var_dump（$ ar）导致：

array(7) {
  [0]=>
  string(1) "p"
  [1]=>
  string(2) "br"
  [2]=>
  string(2) "ul"
  [3]=>
  string(2) "li"
  [4]=>
  string(2) "em"
  [5]=>
  string(6) "strong"
  [6]=>
  array(1) {
    ["a"]=>
    array(2) {
      [0]=>
      string(4) "href"
      [1]=>
      string(5) "title"
    }
  }
}

Answer 3

字符串实际上由三个RegEx模式组成：带有参数的标签（如a[href,title]），没有参数的标签和后面带逗号（如br），abd最后一个没有参数的标签。< / p>

$patterns = [
    'tagWithoutParams' => '/(\w+)\,/',
    'lastTagWithoutParams' => '/\w+$/',
    'tagWithParams' => '/\w+\[\w+[,\w]*\]/',
];
$matches = [
    'tagWithoutParams' => [],
    'lastTagWithoutParams' => [],
    'tagWithParams' => [],
];

$string = 'p, br, a[href,title], img[src,style], ul, li, em, strong';

preg_match_all($patterns['tagWithoutParams'], $string, $matches['tagWithoutParams']);
preg_match_all($patterns['lastTagWithoutParams'], $string, $matches['lastTagWithoutParams']);
preg_match_all($patterns['tagWithParams'], $string, $matches['tagWithParams']);

$tags = array_merge(
    $matches['tagWithoutParams'][1],
    $matches['lastTagWithoutParams'][0],
    $matches['tagWithParams'][0]
);

/*
Another variant:
$patterns = ['tagWithoutParams'] => '/\w+\,/';
and then
array_walk($matches['tagWithoutParams'][0], function (&$value) {
    $value = str_replace(',', '', $value);
});
and
$tags = array_merge(
    $matches['tagWithoutParams'][0],
    $matches['lastTagWithoutParams'][0],
    $matches['tagWithParams'][0]
);
*/

foreach ($tags as $key => $tag) {
    if (strpos($tag, '[')) {
        $tagName = substr($tag, 0, strpos($tag, '['));
        $paramsString = substr($tag, strpos($tag, '[') + 1, (strpos($tag, ']') - strpos($tag, '[') - 1));
        $paramsArray = explode(',', $paramsString);
        $tags[$key] = [$tagName => $paramsArray];
    }
}

// test output
echo '<pre>';
print_r($tags);

将带有方括号的逗号转换为数组

3 个答案: