Question

我将这个单词数组存储在变量$tags中。

  print_r($tags);

     Array
(
[0] => Array
    (
        [token] => Facebooks
        [tag] => NNS
    )

[1] => Array
    (
        [token] => new
        [tag] => JJ

    )

[2] => Array
    (
        [token] => Slingshot
        [tag] => NN

    )

[3] => Array
    (
        [token] => messaging
        [tag] => VBG
    )

[4] => Array
    (
        [token] => app
        [tag] => NNP

    )

[5] => Array
    (
        [token] => the
        [tag] => DT
    )

[6] => Array
    (
        [token] => one
        [tag] => NN
    )

[7] => Array
    (
        [token] => that
        [tag] => IN
    )

[8] => Array
    (
        [token] => forces
        [tag] => NNS
    )

[9] => Array
    (
        [token] => friendship
        [tag] => NN

    )

[10] => Array
    (
        [token] => through
        [tag] => IN
    )

[11] => Array
    (
        [token] => a
        [tag] => DT
    )

[12] => Array
    (
        [token] => special
        [tag] => JJ
    )

[13] => Array
    (
        [token] => reciprocation
        [tag] => NN
    )

[14] => Array
    (
        [token] => mechanic
        [tag] => NN

    )

[15] => Array
    (
        [token] => has
        [tag] => VBZ
    )

[16] => Array
    (
        [token] => today
        [tag] => NN
    )

[17] => Array
    (
        [token] => launched
        [tag] => VBN
    )

[18] => Array
    (
        [token] => worldwide.
        [tag] => JJ
    )

）

我试图仅提取包含[tag] => NN的数组，并使用此删除其他数组：

$kali = array("NN");

echo '<br>';
echo '<br>';

 foreach ( $tags as $k => $array ) {
 if ( $array['tag'] != $kali[0] ) 
        {
    unset($tags[$k]);
        }
   }

   print_r($tags);

这是输出：

      Array
    (
[6] => Array
    (
        [token] => one
        [tag] => NN
    )

[13] => Array
    (
        [token] => reciprocation
        [tag] => NN
    )

[16] => Array
    (
        [token] => today
        [tag] => NN
    )

    )

任务是我做错了什么？为什么dost显示所有数组但只有3个？

总共这个例子中的

是6，它显示在3.为什么？

Answer 1

有时会将spaces或\n或\r等特殊字符添加到字符串的末尾，因此将字符串与另一个字符串进行比较也会评估特殊字符。为了跳过它们，您需要trim字符串然后比较它。

示例

if ( trim($array['tag']) != trim($kali[0]) ) { // code goes here }

不要显示数组的所有特定数据

1 个答案: