How to remove special letters in php regular expression

php正则实现去掉特殊字母的方法：1、创建一个PHP示例文件；2、通过“$str = preg_replace($ddd,'',$str);”去除特殊字符即可。

本文操作环境：Windows7系统，PHP7.1版，Dell G3电脑。

php正则怎么实现去掉特殊字母？

php 正则去除中文，汉字，特殊字符

 正则去除中文，汉字，特殊字符：

$str = '  432.65456787rewqrewq6我的撒    ';
$ddd = "/[ &#39;,:;*?~`!@#$%^&+=)(<>{}]|\]|\[|\/|\\\|\"|\|/";
$cc = &#39;/[\x80-\xff]{0,}/&#39;;
$qq = "/[a-zA-Z]+/";
$str = preg_replace($ddd,&#39;&#39;,$str);
$str = preg_replace($qq,&#39;&#39;,$str);
$str = preg_replace($cc,&#39;&#39;,$str);
echo $str;

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