为了继续Johannes的回答，我在某个论坛上找到了一个解决方案。这个正则表达式可以做到这一点：）

$unicodeRegexp = '([*#0-9](?>\\xEF\\xB8\\x8F)?\\xE2\\x83\\xA3|\\xC2[\\xA9\\xAE]|\\xE2..(\\xF0\\x9F\\x8F[\\xBB-\\xBF])?(?>\\xEF\\xB8\\x8F)?|\\xE3(?>\\x80[\\xB0\\xBD]|\\x8A[\\x97\\x99])(?>\\xEF\\xB8\\x8F)?|\\xF0\\x9F(?>[\\x80-\\x86].(?>\\xEF\\xB8\\x8F)?|\\x87.\\xF0\\x9F\\x87.|..(\\xF0\\x9F\\x8F[\\xBB-\\xBF])?|(((?<zwj>\\xE2\\x80\\x8D)\\xE2\\x9D\\xA4\\xEF\\xB8\\x8F\k<zwj>\\xF0\\x9F..(\k<zwj>\\xF0\\x9F\\x91.)?|(\\xE2\\x80\\x8D\\xF0\\x9F\\x91.){2,3}))?))';

这是无耻地复制和调整，从这个函数here。所以赞扬Huy Nguyen Quang谁写了原来的函数。

function has_emojis_old( $string ) {

    preg_match( '/[\x{1F600}-\x{1F64F}]/u', $string, $matches_emo );

    return !empty( $matches_emo[0] ) ? true : false;

}

• • 编辑：**

如前所述，有一些表情符号是上面的功能无法检测的。我已经检查过了，这是绝对正确的。
原因是上面的函数检查unicode范围（类似于：这个字符是否在5到15之间）。但是有很多表情符号不在这个范围内。可以增加unicode的范围，但是可能有一些字符不在这个范围内......所以这看起来不是很优雅。
原来的功能检查多个范围，这可能是最好的解决方案。事情是，这个功能是4年前更新的，所以它肯定不能反映当前的表情调色板。
因为我不是很喜欢表情符号和它们的unicode范围，所以我不能提供一个基于范围的解决方案......相反，我只是检查all existing emoji unicodes：

function has_emojis( $string ) {

    // Array of emoji (v12, 2019) unicodes from https://unicode.org/emoji/charts/emoji-list.html

    $unicodes = array( 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);

    return preg_match( '/[\x{' . implode( '}\x{', $unicodes ) . '}]/u', $string ) ? true : false;

}

这个功能-当然-必须更新每一个新的表情符号发布，但这必须发生的范围解决方案以及。

使用以下函数：

function remove_emoji($string) {

    // Match Emoticons
    $regex_emoticons = '/[\x{1F600}-\x{1F64F}]/u';
    $clear_string = preg_replace($regex_emoticons, '', $string);

    // Match Miscellaneous Symbols and Pictographs
    $regex_symbols = '/[\x{1F300}-\x{1F5FF}]/u';
    $clear_string = preg_replace($regex_symbols, '', $clear_string);

    // Match Transport And Map Symbols
    $regex_transport = '/[\x{1F680}-\x{1F6FF}]/u';
    $clear_string = preg_replace($regex_transport, '', $clear_string);

    // Match Miscellaneous Symbols
    $regex_misc = '/[\x{2600}-\x{26FF}]/u';
    $clear_string = preg_replace($regex_misc, '', $clear_string);

    // Match Dingbats
    $regex_dingbats = '/[\x{2700}-\x{27BF}]/u';
    $clear_string = preg_replace($regex_dingbats, '', $clear_string);

    return $clear_string;
}

你可以检测表情符号下面的代码：

function hasEmoji($string)
{
    $emojis_regex =
        '/[\x{0080}-\x{02AF}'
        .'\x{0300}-\x{03FF}'
        .'\x{0600}-\x{06FF}'
        .'\x{0C00}-\x{0C7F}'
        .'\x{1DC0}-\x{1DFF}'
        .'\x{1E00}-\x{1EFF}'
        .'\x{2000}-\x{209F}'
        .'\x{20D0}-\x{214F}'
        .'\x{2190}-\x{23FF}'
        .'\x{2460}-\x{25FF}'
        .'\x{2600}-\x{27EF}'
        .'\x{2900}-\x{29FF}'
        .'\x{2B00}-\x{2BFF}'
        .'\x{2C60}-\x{2C7F}'
        .'\x{2E00}-\x{2E7F}'
        .'\x{3000}-\x{303F}'
        .'\x{A490}-\x{A4CF}'
        .'\x{E000}-\x{F8FF}'
        .'\x{FE00}-\x{FE0F}'
        .'\x{FE30}-\x{FE4F}'
        .'\x{1F000}-\x{1F02F}'
        .'\x{1F0A0}-\x{1F0FF}'
        .'\x{1F100}-\x{1F64F}'
        .'\x{1F680}-\x{1F6FF}'
        .'\x{1F910}-\x{1F96B}'
        .'\x{1F980}-\x{1F9E0}]/u';
    preg_match($emojis_regex, $string, $matches);
    return !empty($matches);
}

hasEmoji('Happy birth day'); // false
hasEmoji('Happy birth day 🎂'); // true

如果您只想检测它们而不是提取它们，也许可以尝试以下方法。

$string = "some string from wherever ..";
$encstr = rawurlencode($string);
$stat = strpos($encstr,"%F0") !== false ? "Has emoji" : "No emoji.";
echo $stat;

显然，请更改输出以适合您的情况。
在我的测试中，这个页面上的所有其他解决方案都遗漏了一些表情符号，但这个解决方案检测到了我目前测试的所有表情符号。
有可能会出现误报，您可能需要小心。

这对我很有效：

$emojis_regex = '/[\x{1F600}-\x{1F64F}\x{2700}-\x{27BF}\x{1F680}-\x{1F6FF}\x{24C2}-\x{1F251}\x{1F30D}-\x{1F567}\x{1F900}-\x{1F9FF}\x{1F300}-\x{1F5FF}\x{1FA70}-\x{1FAF6}]/u';

preg_match($emojis_regex, $string, $matches);

if (!empty($matches)) {
    echo "has Emoji " . $string;
} else {
    echo "doesn't have Emoji " . $string;
}

下面是这个正则表达式https://regex101.com/r/LdYElj/1包含的表情符号列表

更好的方法是将字符串存储为编码的unicode，并在访问时对其进行解码，如下所示：

<?php

declare(strict_types=1);

namespace App\Model;

use Doctrine\ORM\Mapping as ORM;

/**
 * @final
 */
trait DescriptionTrait
{
    /**
     * @var string|null
     *
     * @ORM\Column(type="text", nullable=true)
     */
    protected $description;

    /**
     * @return string|null
     */
    public function getDescription(): ?string
    {
        return \utf8_decode($this->description);
    }

    /**
     * @param string|null $description
     *
     * @return self
     */
    public function setDescription(?string $description): self
    {
        $this->description = \utf8_encode($description);
        return $this;
    }
}

检测表情符号的最佳方法是使用Unicode regex选项中的Symbol属性。

preg_match('/\p{S}/u', $string, $output);

https://www.php.net/manual/en/regexp.reference.unicode.php