PHP 正则表达式 - 仅过滤器编号
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PHP regular expression - filter number only
提问by user398341
I know this might sound as really dummy question, but I'm trying to ensure that the provided string is of a number / decimal format to use it later on with PHP's number_format() function.
我知道这听起来可能是一个非常愚蠢的问题，但我试图确保提供的字符串是数字/十进制格式，以便稍后与 PHP 的 number_format() 函数一起使用。
How would I do it - say someone is typing 15:00 into the text field - what regular expression and php function should I use to remove the colon from it and make it only return the valid characters.
我该怎么做 - 假设有人在文本字段中输入 15:00 - 我应该使用什么正则表达式和 php 函数来从中删除冒号并使其只返回有效字符。
preg_match() returns array - so I can't pass the result to number_format() unless I implode() it or something like this.
preg_match() 返回数组 - 所以我不能将结果传递给 number_format() 除非我 implode() 它或类似的东西。
Your help would be very much appreciated.
您的帮助将不胜感激。
回答by buley
Using is_numericor intvalis likely the best way to validate a number here, but to answer your question you could try using preg_replaceinstead. This example removes all non-numeric characters:
在这里使用is_numeric或intval可能是验证数字的最佳方法，但要回答您的问题，您可以尝试使用preg_replace代替。此示例删除所有非数字字符：
$output = preg_replace( '/[^0-9]/', '', $string );
回答by netcoder
To remove anything that is not a number:
要删除任何不是数字的内容：
$output = preg_replace('/[^0-9]/', '', $input);
Explanation:
解释：
[0-9]matches any number between 0 and 9 inclusively.^negates a[]pattern.- So,
[^0-9]matches anything that is not a number, and since we're usingpreg_replace, they will be replaced by nothing''(second argument ofpreg_replace).
[0-9]匹配 0 到 9 之间的任意数字。^否定一个[]模式。- 因此，
[^0-9]匹配任何不是数字的东西，因为我们使用的是preg_replace，所以它们将被替换为空''（ 的第二个参数preg_replace）。
回答by SileNT
You can try that one:
你可以试试那个：
$string = preg_replace('/[^0-9]/', '', $string);
Cheers.
干杯。
回答by Headshota
use built in php function is_numericto check if the value is numeric.
使用内置的 php 函数is_numeric来检查值是否为数字。
回答by Kyle Coots
You could do something like this if you want only whole numbers.
如果你只想要整数，你可以做这样的事情。
function make_whole($v){
$v = floor($v);
if(is_numeric($v)){
echo (int)$v;
// if you want only positive whole numbers
//echo (int)$v = abs($v);
}
}
回答by Samuel
Another way to get only the numbers in a regex string is as shown below:
另一种仅获取正则表达式字符串中数字的方法如下所示：
$output = preg_replace("/\D+/", "", $input);
