Check if number is decimal

Question

I need to check in PHP if user entered a decimal number  US way  with decimal point  X XXX   Any reliable way to do this

User · Answer

This is a more tolerate way to handle this with user input  This regex will match both  100  or  100 1  but doesn t allow for negative numbers       d      d

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if you want  quot 10 00 quot  to return true check Night Owl s answer If you want to know if the decimals has a value you can use this answer  Works with all kind of types  int  float  string  if fmod  val  1      0 00          your code if its decimals has a value   else          your code if the decimals are  00  or is an integer     Examples   fmod 1 00     1      0 00        returns false  fmod 2        1      0 00        returns false  fmod 3 01     1      0 00        returns true  fmod 4 33333  1      0 00        returns true  fmod 5 00000  1      0 00        returns false  fmod  6 50    1      0 00        returns true   Explanation  fmod returns the floating point remainder  modulo  of the division of the arguments   hence the      0 00   Modulus operator - why not use the modulus operator  E g    val   1    0  From the PHP docs   Operands of modulus are converted to integers  by stripping the decimal part  before processing   Which will effectively destroys the op purpose  in other languages like javascript you can use the modulus operator

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function is decimal value   a          d 0   i 0       b  str split trim  a           foreach    b as  c             if    i  0  amp  amp  strpos  c  -     continue           i            if   is numeric  c    continue          if   stripos  c          0                  d                if    d  gt  1   return FALSE              else continue            else         return FALSE            return TRUE      Known Issues with the above function   1  Does not support  scientific notation   1 23E-123   fiscal  leading   or other  or  Trailing f   C   style floats  or  trailing currency   USD  GBP etc   2  False positive on string filenames that match a decimal  Please note that for example  10 0  as a filename cannot be distinguished from the decimal  so if you are attempting to detect a type from a string alone  and a filename matches a decimal name and has no path included  it will be impossible to discern

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is numeric returns true for decimals and integers  So if your user lazily enters 1 instead of 1 00 it will still return true   echo is numeric 1      true echo is numeric 1 00      true   You may wish to convert the integer to a decimal with PHP  or let your database do it for you

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i use this   function is decimal   price      value  trim  price      trim space keys    value  is numeric  value      validate numeric and numeric string  e g   12 00  1e00  123  but not -123    value  preg match     d      value      only allow any digit e g   0 1 2 3 4 5 6 7 8 9  This will eliminate the numeric string  e g   1e00    value  round  value  2      to a specified number of decimal places e g   1 12345  gt  1 12    return  value

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The function you posted is just not PHP   Have a look at is float  docs    Edit  I missed the  user entered value  part  In this case you can actually use a regular expression     d    d

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If you are working with form validation  Then in this case form send string  I used following code to check either form input is a decimal number or not  I hope this will work for you too   function is decimal  input               alphabets   str split  input        find   array  0   1   2   3   4   5   6   7   8   9           Please note  All intiger numbers are decimal  If you want to check numbers without point     then you can remove     from array        foreach   alphabets as  key   gt   alphabet            if   in array  alphabet   find                 return false                          Check if user has enter     point more then once      if  substr count  input        gt  1            return false             return true

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the easy way to find either posted value is integer and float so this will help you    postedValue    this- gt input- gt post  value    if is numeric   postedValue    amp  amp  floor   postedValue          echo  success     else      echo  unsuccess       if you give 10 or 10 5 or 10 0 the result will be success if you define any character or specail character without dot it will give unsuccess

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Simplest solution is   if is float 2 3      echo  true

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You can get most of what you want from is float  but if you really need to know whether it has a decimal in it  your function above isn t terribly far  albeit the wrong language    function is decimal   val         return is numeric   val    amp  amp  floor   val       val

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another way to solve this  preg match     d    d      number

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If all you need to know is whether a decimal point exists in a variable then this will get the job done     function containsDecimal   value         if   strpos   value            false             return true            return false      This isn t a very elegant solution but it works with strings and floats   Make sure to use     and not    in the strpos test or you will get incorrect results

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Maybe try looking into this as well   is int

User · Answer

A total cludge   but hey it works     numpart   explode       sumnum     if   exists  numpart 1    amp  amp    numpart 1   gt  0           it s a decimal that is greater than zero   else      its not a decimal  or the decimal is zero

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I was passed a string  and wanted to know if it was a decimal or not  I ended up with this   function isDecimal  value          return   float   value     floor  value        I ran a bunch of test including decimals and non-decimals on both sides of zero  and it seemed to work

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lat    -25 3654    if preg match        lat         echo   nYes its a decimal value n     else      echo  No its not a decimal value

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if numeric   if  is numeric  field              whole   floor  field            fraction    field -  whole              if decimal                     if   fraction  gt  0                 do sth         else            if integer                do sth    else        if non-numeric       do sth

[php] Check if number is decimal

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