在php中比較兩個字符串並添加標記

Question

我想匹配兩個字符串，如果有任何單詞匹配我想爲它們添加標記。

我試過類似下面下面的代碼

$old = "one two three"; 

$new = "how is one related to two"; 

foreach (explode(" ", $old) as $str) { 
    $str .= str_replace($str, "<b>$new</b>", $str); 
} 
echo trim($str); 

Exptected結果how is <b>one</b> related to <b>two</b>。

如果可能的話，請給我建議一些其他的方式，如循環。如果不可能，請告訴我循環。

Answer 1

記住：

str_replace(look_for_this , replace_it_wtih_this, look_through_this); 

在代碼中，你使用.=，這將只是複製在每個迭代上一個新的句子。我會做這種方式：

$old = "one two three"; 
$sentence = "how is one related to two"; 
$arr = explode(" ", $old); 
foreach ($arr as $word) { 
    $sentence = str_replace($word, "<b>$word</b>", $sentence); 
} 
echo trim($sentence); 

結果：

how is <b>one</b> related to <b>two</b> 

Answer 2

試試這個：

foreach(explode(" ",$old) as $lol) 
{ 
    $new = str_replace($lol, "<b>".$lol."</b>", $new); 
} 

Answer 3

這是一個辦法做到這一點，我認爲錯誤是使用.=代替=以及一些混合參數str_replace()（PHP Sandbox）

$searchwords = "one two three"; 

$string = "how is one related to two"; 

foreach (explode(" ", $searchwords) as $searchword) { 
    $string = str_replace($searchword, "<b>{$searchword}</b>", $string); 
} 

echo trim($string); 

Answer 4

嘗試使用preg_replace函數，而不是循環

<?php 
$pattern = "/one|two|three/i"; 
$string = "how is one related to two"; 
$replacement = "<b>$0</b>"; 
$result = preg_replace($pattern, $replacement, $string); 
echo $result; 

結果將是

how is <b>one</b> related to <b>two</b> 

您可以從here檢查出的preg_replace。

Answer 5

的preg_replace所有：

function _replace($old,$new){ 
    $search = str_replace(' ',')|(',$old); 
    return preg_replace("/($search)/i",'<b>$0</b>',$new); 
} 
echo _replace("one two three","how is one related to two");