哪个验证规则用于 Laravel 4 的浮点数？
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Which validation rule to use for a float with Laravel 4?
提问by Isaias
I have a form with two text inputs that must be floats (specifically, these text inputs are for geographic coordinates), looked at the documentationand found a rule for integerand numericbut not for float.
我有一个包含两个文本输入的表单，它们必须是浮点数（具体来说，这些文本输入是 for geographic coordinates），查看了文档并找到了一个规则 for integerandnumeric但不是 for float。
I was thinking using the "numeric" because the text inputs are disabled and the value only changes when a marker on a map is moved.
我正在考虑使用“数字”，因为文本输入被禁用，并且只有在移动地图上的标记时才会更改值。
What would be the best way to validate a float?
验证浮动的最佳方法是什么？
采纳答案by The Alpha
You may use a regular expression rule (regex:pattern) for this and since you want to use to validate Geographic Coordinatesthen you should use a regular expression rule because a Geo Coordmay look something like 23.710085, 90.406966, which is the coordinates (lat long) of Dhaka Bangladeshand it also may contain a coordinates like -33.805789,151.002060. So here is the syntax:
您可以regex:pattern为此使用正则表达式规则 ( ) 并且由于您要用于验证，Geographic Coordinates因此您应该使用正则表达式规则，因为 aGeo Coord可能看起来像23.710085, 90.406966，它是 的坐标（经纬度），Dhaka Bangladesh它也可能包含坐标喜欢-33.805789,151.002060。所以这里是语法：
$rules = array('form_field_name' => 'required|regex:pattern' );
Or maybe just
或者也许只是
$rules = array('form_field_name' => 'regex:pattern' );
So, the pattern should be something like this /^[+-]?\d+\.\d+, ?[+-]?\d+\.\d+$/. So, finally, it should look something like this (pattern is copied from internet):
所以，模式应该是这样的/^[+-]?\d+\.\d+, ?[+-]?\d+\.\d+$/。所以，最后，它应该看起来像这样 ( pattern is copied from internet)：
$rules = array('form_field_name' => 'regex:/^[+-]?\d+\.\d+, ?[+-]?\d+\.\d+$/');
Check the Laravel Validation (regex).
回答by Kemal Fadillah
The numericrule can be used for that because it uses the is_numeric()function to test the value. Although, normally you'd want something that uses the is_float()function, since form inputs are in the form or string, is_numeric()should be used instead. Here's a quote from the PHP doc for is_float:
该numeric规则可用于此，因为它使用is_numeric()函数来测试值。虽然，通常你想要使用该is_float()函数的东西，因为表单输入是表单或字符串，is_numeric()应该使用。这是PHP 文档中 is_float的引用：
To test if a variable is a number or a numeric string (such as form input, which is always a string), you must use is_numeric().
要测试变量是数字还是数字字符串（例如表单输入，它始终是字符串），必须使用 is_numeric()。
回答by Raul Duran
'latitude' => 'regex:/^-?\d{1,2}\.\d{6,}$/',
'longitude' => 'regex:/^-?\d{1,2}\.\d{6,}$/',
回答by macieks
Validator::extend('gps', function($attribute, $value, $parameters) {
if (preg_match('/^-?\d{1,2}\.\d{6,}\s*,\s*-?\d{1,2}\.\d{6,}$/', $value)) {
return true;
} else {
return false;
}
});
