Question

我想知道如何在使用PHP爆炸字符串时删除所有空值，例如，让用户输入",jay,john,,,bill,glenn,,,"？

提前感谢您的帮助。

以下是爆炸用户提交的值的代码的一部分。

$tags = explode(",", $_POST['tag']);

Answer 1

E.g。通过array_filter()或使用preg_split()上的PREG_SPLIT_NO_EMPTY选项

<?php
// only for testing purposes ...
$_POST['tag'] = ",jay,john,,,bill,glenn,,0,,";

echo "--- version 1: array_filter ----\n";
// note that this also filters "0" out, since (bool)"0" is FALSE in php
// array_filter() called with only one parameter tests each element as a boolean value
// see http://docs.php.net/language.types.type-juggling
$tags = array_filter( explode(",", $_POST['tag']) ); 
var_dump($tags);

echo "--- version 2: array_filter/strlen ----\n";
// this one keeps the "0" element
// array_filter() calls strlen() for each element of the array and tests the result as a boolean value
$tags = array_filter( explode(",", $_POST['tag']), 'strlen' ); 
var_dump($tags);

echo "--- version 3: PREG_SPLIT_NO_EMPTY ----\n";
$tags = preg_split('/,/', $_POST['tag'], -1, PREG_SPLIT_NO_EMPTY);
var_dump($tags);

打印

--- version 1: array_filter ----
array(4) {
  [1]=>
  string(3) "jay"
  [2]=>
  string(4) "john"
  [5]=>
  string(4) "bill"
  [6]=>
  string(5) "glenn"
}
--- version 2: array_filter/strlen ----
array(5) {
  [1]=>
  string(3) "jay"
  [2]=>
  string(4) "john"
  [5]=>
  string(4) "bill"
  [6]=>
  string(5) "glenn"
  [8]=>
  string(1) "0"
}
--- version 3: PREG_SPLIT_NO_EMPTY ----
array(5) {
  [0]=>
  string(3) "jay"
  [1]=>
  string(4) "john"
  [2]=>
  string(4) "bill"
  [3]=>
  string(5) "glenn"
  [4]=>
  string(1) "0"
}

Answer 2

$tags = array_diff(explode(",", $_POST['tag']),array(""));

Answer 3

//replace multiple commas
$tags = preg_replace('/,+/', ',', $_POST['tag']);
//explode
$tags = explode(',', $tags);

Answer 4

只需尝试：

$tags = explode(", ", $_POST['tag']);

在逗号后添加空格，即可完成工作！

当我使用PHP爆炸字符串时，如何删除所有空值？

4 个答案: