How to delete numbers in string in php
php删除字符串中的数字的方法:可以利用正则表达式并结合preg_replace()函数来实现。preg_replace()函数可以执行一个正则表达式的搜索与替换。
preg_replace 函数执行一个正则表达式的搜索和替换。
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语法:
preg_replace(mixed $pattern, mixed $replacement, mixed $subject[, int $limit = -1[, int &$count]])
参数:
$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。
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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。
举例:
$class=preg_replace("/\\d+/",'', $res);
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