php 如何为每个搜索词包装 html 标签，

Question

如何为每个搜索词包裹html标签，比如高亮词。我在这里尝试了我的代码，但没有任何改变。请问是哪里出了问题，或者有什么好的方法吗？谢谢。

<?php
$sentence = "for loops are the most complex loops in PHP. They behave like their C counterparts";//original
$search = 'php counterparts';//search words
$str = explode(' ',$search);//explode every search word
for($i=0;$i<10;$i++){
    if($str[$i]!=''){ //make sure if $str[$i] is not empty, do $newstr.
        $newstr .= '\'<b>'.$str[$i].'</b>\','; //wrap <b> tag for search words
    }
}
$newstr = substr($newstr, 0, strlen($newstr)-1);//remove last common, combine a array

$new = str_ireplace(array($str),array($newstr),$sentence);
echo $new;
?>

Answer 1

为什么数组以 10 次迭代为界？为什么要用一个字符串来保存修改后的词呢？当您不使用正则表达式函数进行替换时，为什么要对正则表达式进行分界？

甚至不要尝试修复此代码 - 从头开始​​:

$sentence = "for loops are the most complex loops in PHP. They behave like their C counterparts";//original
$search = 'php counterparts';//search words
$srch_words = explode(' ',$search);//explode every search word
$replace_words=array();
foreach ($srch_words as $key=>$val) {
     $replace_words[$key]='<b>' . $val . '</b>';
}
$sentence=str_ireplace($srch_words, $replace_words, $sentence);