将字符串中的单词替换为突出显示的单词，将其大小写保存为已找

Question

我想用突出显示的单词替换字符串中找到的单词，保持其大小写。

示例

$string1 = 'There are five colors';
$string2 = 'There are Five colors';

//replace five with highlighted five
$word='five';
$string1 = str_ireplace($word, '<span style="background:#ccc;">'.$word.'</span>', $string1);    
$string2 = str_ireplace($word, '<span style="background:#ccc;">'.$word.'</span>', $string2);

echo $string1.'<br>';
echo $string2;

当前输出：

  

有five种颜色   有five种颜色

预期输出：

  

有five种颜色   有Five种颜色

如何做到这一点？

Answer 1

突出显示不区分大小写的单个单词

将preg_replace()与以下正则表达式一起使用：

/\b($p)\b/i

<强>解释

• / - 开始分隔符
• \b - 匹配字边界
• ( - 首次捕获群组的开始
• $p - 转义搜索字符串
• ) - 第一个捕获组的结束
• \b - 匹配字边界
• / - 结束分隔符
• i - 模式修饰符，使搜索不区分大小写

替换模式可以是<span style="background:#ccc;">$1</span>，其中$1是反向引用 - 它将包含第一个捕获组匹配的内容（在本例中，它是搜索的实际单词） ）

<强>代码：

$p = preg_quote($word, '/');  // The pattern to match

$string = preg_replace(
    "/\b($p)\b/i",
    '<span style="background:#ccc;">$1</span>', 
    $string
);

See it in action

---

突出显示不区分大小写的单词数组

$words = array('five', 'colors', /* ... */);
$p = implode('|', array_map('preg_quote', $words));

$string = preg_replace(
    "/\b($p)\b/i", 
    '<span style="background:#ccc;">$1</span>', 
    $string
);

var_dump($string);

See it in action

Answer 2

str_replace - 区分大小写

str_ireplace - class insenstive

http://www.php.net/manual/en/function.str-replace.php

http://www.php.net/manual/en/function.str-ireplace.php

以下是测试用例。

<?php

class ReplaceTest extends PHPUnit_Framework_TestCase
{

    public function testCaseSensitiveReplaceSimple()
    {
        $strings = array(
            'There are five colors',
            'There are Five colors',
        );

        $expected = array(
            'There are <span style="background:#ccc;">five</span> colors',
            'There are <span style="background:#ccc;">Five</span> colors',
        );

        $find = array(
            'five',
            'Five',
        );

        $replace = array(
            '<span style="background:#ccc;">five</span>',
            '<span style="background:#ccc;">Five</span>',
        );

        foreach ($strings as $key => $string) {
            $this->assertEquals($expected[$key], str_replace($find, $replace, $string));
        }
    }

    public function testCaseSensitiveReplaceFunction()
    {
        $strings = array(
            'There are five colors',
            'There are Five colors',
        );

        $expected = array(
            'There are <span style="background:#ccc;">five</span> colors',
            'There are <span style="background:#ccc;">Five</span> colors',
        );

        foreach ($strings as $key => $string) {
            $this->assertEquals($expected[$key], highlightString('five', $string, '<span style="background:#ccc;">$1</span>'));
        }
    }
}

/**
 * @argument $words array or string - words to that are going to be highlighted keeping case
 * @argument $string string - the search 
 * @argument $replacement string - the wrapper used for highlighting, $1 will be the word
 */
function highlightString($words, $string, $replacement)
{
    $replacements = array();
    $newwords = array();
    $key = 0;
    foreach ((array) $words AS $word)
    {
        $replacements[$key] = str_replace('$1', $word, $replacement);
        $newwords[$key] = $word;
        $key++;
        $newwords[$key] = ucfirst($word);
        $replacements[$key] = str_replace('$1', ucfirst($word), $replacement);
        $key++;
    }

    return str_replace($newwords, $replacements, $string);
}

结果

..

Time: 25 ms, Memory: 8.25Mb

OK (2 tests, 4 assertions)