php去除字符串中数字的方法:首先创建一个PHP示例文件;然后使用“$class=preg_replace("/\\d+/",'', $res);”方法去除字符串中数字即可。
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PHP去掉字符串中的数字
这个比较简单,但是也有些需要注意的地方,先贴代码
$class=preg_replace("\\d+",'', $res);
需要使用preg_replace函数,但是只是这么写的话,会报错
Warning: preg_replace(): Delimiter must not be alphanumeric or backslash
翻译过来就是定界符不能是字母数字或反斜线。
想了一下,在正则表达式首尾加了一对/
$class=preg_replace("/\\d+/",'', $res);
这样就成功了
相关介绍:
preg_replace 函数执行一个正则表达式的搜索和替换。
语法
mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )
搜索 subject 中匹配 pattern 的部分, 以 replacement 进行替换。
参数说明:
$pattern: 要搜索的模式,可以是字符串或一个字符串数组。
$replacement: 用于替换的字符串或字符串数组。
$subject: 要搜索替换的目标字符串或字符串数组。
$limit: 可选,对于每个模式用于每个 subject 字符串的最大可替换次数。 默认是-1(无限制)。
$count: 可选,为替换执行的次数。
返回值
如果 subject 是一个数组, preg_replace() 返回一个数组, 其他情况下返回一个字符串。
如果匹配被查找到,替换后的 subject 被返回,其他情况下 返回没有改变的 subject。如果发生错误,返回 NULL。
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