PHP regular expression - filter number only

Question

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   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   preg match   returns array - so I can t pass the result to number format   unless I implode   it or something like this   Your help would be very much appreciated

User · Answer

This is the right answer preg match  quot    0-9     quot    yourstr    This function return TRUE 1  if it matches or FALSE 0  if it doesn t Quick Explanation         means that it should begin with the following   in our case is a range of digital numbers  0-9      to avoid cases like   quot abdjdf125 quot           means there should be at least one digit       means after our pattern the string should end   to avoid cases like   quot 125abdjdf quot

User · Answer

You could do something like this if you want only whole numbers   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

User · Answer

Using is numeric or intval is likely the best way to validate a number here  but to answer your question you could try using preg replace instead  This example removes all non-numeric characters    output   preg replace      0-9          string

User · Answer

To remove anything that is not a number    output   preg replace     0-9          input     Explanation     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 using preg replace  they will be replaced by nothing     second argument of preg replace

User · Answer

use built in php function is numeric to check if the value is numeric

User · Answer

Another way to get only the numbers in a regex string is as shown below    output   preg replace    D          input

User · Answer

You can try that one    string   preg replace     0-9          string     Cheers

[php] PHP regular expression - filter number only

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