找到正确的发生顺序答案

【问题标题】：Finding the correct occurrence order找到正确的发生顺序
【发布时间】：2013-09-11 14:02:43
【问题描述】：

我有一个 PHP 字符串，例如这个字符串 (haystack)：

$text = "here is a sample: this text, and this will be exploded. this also | this one too :)";

现在我想按照针在字符串中出现的顺序设置一个 PHP 数组。所以这是我的针：

$needle = array(",",".","|",":");

在$text 字符串中搜索针时，应该是输出：

Array (
   [0] => :
   [1] => ,
   [2] => .
   [3] => |
   [4] => :
)

这可以在 PHP 中实现吗？

这类似于question，但这是针对 JavaScript 的。

【问题讨论】：

使用preg_match_allpreg_match_all('/\:|\,|\||)/i', '"这里是一个样例：这个文本，这个会被分解。这个也是|这个一个也是 :)"', $result);
$result 会给你你想要的输出
在stackoverflow.com/a/18743579/1719246下方查看我的答案
在下方查看我的更正答案 (stackoverflow.com/a/18743573/2304043)。它应该可以解决您的问题

标签： php

【解决方案1】：

str_split 在这里可以派上用场

$text = "here is a sample: this text, and this will be exploded. this also | this one too :)";
$needles = array(",",".","|",":");
$chars = str_split($string);

$found = array();

foreach($chars as $char){
  if (in_array($char, $needles)){
    $found[] = $char ;
  }
}

【讨论】：

您的代码的问题是，如果任何针不止一次出现，它也会在 $found 数组中出现不止一次。您应该在“if”条件上添加“ && !in_array($char, $found)”。
@Scalpweb 所以，看看他的结果。这正是他所需要的。 [0] 和 [4] 索引。
感谢它运行良好，而且这段代码是 Xdebug 中的禁食代码之一（并且在我的设置中工作）。

【解决方案2】：

好吧，让我们只是为了好玩

$string = "here is a sample: this text, and this will be exploded. this also | this one too :)";
$needle = array(",",".","|",":");
$chars  = implode($needle);
$list   = array();

while (false !== $match = strpbrk($string, $chars)) {
    $list[] = $match[0];
    $string = substr($match, 1);
}

var_dump($list);

你可以see it working - 了解strpbrk

说明

strpbrk 返回第一个匹配字符之后的字符串

1 号弯

$string = "here is a sample: this text, and this will be exploded. this also | this one too :)";

// strpbrk matches ":"
$match = ": this text, and this will be exploded. this also | this one too :)";

// Then, we push the first character to the list ":"
$list = array(':');

// Then we substract the first character from the string
$string = " this text, and this will be exploded. this also | this one too :)";

2 号弯

$string = " this text, and this will be exploded. this also | this one too :)";

// strpbrk matches ","
$match = ", and this will be exploded. this also | this one too :)";

// Then, we push the first character to the list ","
$list = array(':', ',');

// Then we substract the first character from the string
$string = " and this will be exploded. this also | this one too :)";

以此类推，直到没有匹配到

5 号弯

$string = ")";

// strpbrk doesn't match and return false
$match = false;

// We get out of the while

【讨论】：

【解决方案3】：

$string = "here is a sample: this text, and this will be exploded. th
is also | this one too :)";

preg_match_all('/\:|\,|\||\)/i', $string, $result); 

print_r(  array_shift($result) );

使用preg_match_all

模式\:|\,|\||\)

Working demo...

【讨论】：

【解决方案4】：

这将为您提供预期的结果：

     <?php
    $haystack= "here is a sample: this text, and this will be exploded. this also | this one too :)";
    $needles = array(",",".","|",":");
    $result=array();
    $len = strlen($haystack) ;
    for($i=0;$i<$len;$i++) {
        if(in_array($haystack[$i],$needles)) {
            $result[]=$haystack[$i];
        }
    }
    var_dump($result);
?>

【讨论】：