Php

Question

我想从字符串中拆分单词。例如，我的字符串是 "In the #name of god" 而我只需要 "name" ！！但是当我使用这个片段时，return 我 "name of god"

$string = "In the #name of god";    
$word   = explode( '#', $string );
echo $word;

Answer 1

编辑

对不起，我刚才看错了

Explode 将字符串转换为数组。所以你的输出将导致 ["In the ", "name of god"]。如果你想了解它，你需要更具体地说明它是如何工作的。如果您只想捕捉主题标签后的第一个词，您应该使用 strpos and substr.

$string = "In the #name of god";
$hashtag_pos = strpos($string, "#");
if($hashtag_pos === false)
    echo ""; // hashtag not found
else {
    $last_whitespace_after_hashtag = strpos($string, " ", $hashtag_pos);
    $len = $last_whitespace_after_hashtag === false ? strlen($string)-($hashtag_pos+1) : $last_whitespace_after_hashtag - ($hashtag_pos+1);
    echo substr($string, $hashtag_pos+1, strpos($string, " ", $len));
}

Answer 2

$string = "In the #name of god";

// Using `explode`
$word   = @reset(explode(' ', end(explode( '#', $string ))));
echo $word; // 'name'

// Using `substr`
$pos1 = strpos($string, '#');
$pos2 = strpos($string, ' ', $pos1) - $pos1;
echo substr($string, $pos1 + 1, $pos2);  // 'name'

Note: The @ character before the reset function is an Error Control Operators. It avoid to display a warning message when using end function with a non-reference variable, and yes, it's a bad practice. You should create your own variable and pass to end function. Like this:

// Using `explode`
$segments = explode( '#', $string );
$segments = explode(' ', end($segments));
$word = reset($segments);
echo $word; // 'name'

Answer 3

尝试正则表达式和 preg_match

$string = "In the #name of god";
preg_match('/(?<=#)\w+/', $string, $matches);

print_r($matches);

输出：

Array ( [0] => name )

Answer 4

有几个选项（preg_match 也有助于“#”的多个实例）

<?php
//With Explode only (meh)
$sen = "In the #name of god";
$w = explode(' ', explode('#',$sen)[1])[0];

echo $w;

//With substr and strpos
$s = strpos($sen , '#')+1; // find where # is
$e = strpos(substr($sen, $s), ' ')+1; //find i
$w = substr($sen, $s, $e);

echo $w;

//with substr, strpos and explode
$w = explode(' ', substr($sen, strpos($sen , '#')+1))[0];
echo $w;

Answer 5

在我自己的项目中，我肯定会避免进行一些函数调用来复制一个 preg_ 函数调用可以完成的工作。

实际上，匹配文字 #，然后用 \K“忘记”它，然后匹配一个或多个非空白字符。如果字符串中有匹配项，则通过索引 0 访问完整字符串匹配项。

代码：(Demo)

$string = "In the #name of god";

echo preg_match('~#\K\S+~', $string, $match) ? $match[0] : '';
// output: name

Php - 通过在字符串中分解特定单词

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编辑