Re: [PHP] variable type - conversion/checking

On 3/14/2013 4:05 PM, Matijn Woudt wrote:
> On Thu, Mar 14, 2013 at 11:44 PM, Jim Lucas <[email protected]> wrote:
>
>> On 03/14/2013 11:50 AM, Samuel Lopes Grigolato wrote:
>>
>>> Something like "if (is_numeric($var)&&  $var == floor($var))" will do the
>>>
>>> trick. I don't know if there's a better (more elegant) way.
>>>
>>>
>>> On Thu, Mar 14, 2013 at 3:09 PM, Matijn Woudt<[email protected]>  wrote:
>>>
>>>   On Thu, Mar 14, 2013 at 7:02 PM, georg<[email protected]**>
>>>>   wrote:
>>>>
>>>>   Hi,
>>>>>
>>>>> I have tried to find a way to check if a character string is possible to
>>>>> test whether it is convertible to an intger !
>>>>>
>>>>> any suggestion ?
>>>>>
>>>>> BR georg
>>>>>
>>>>
>>>>
>>>> You could use is_numeric for that, though it also accepts floats.
>>>>
>>>> - Matijn
>>>>
>>>>
>>>
>> for that type of test I have always used this:
>>
>> if ( $val == (int)$val ) {
>>
>> http://www.php.net/manual/en/**language.types.integer.php#**
>> language.types.integer.casting<http://www.php.net/manual/en/language.types.integer.php#language.types.integer.casting>
>>
>>
> I hope you're not serious about this...
>
> When comparing a string and an int, PHP will translate the string to int
> too, and of course they will always be equal then.
> So:
> $a = "abc";
> if($a == (int)$a) echo "YES";
> else echo "NO";
> Will always return YES.
>
> - Matijn
>

Hmmmm...  Interesting.  Looking back at my code base where I thought I 
was doing that, turns out the final results were not that, but this:

$value = "asdf1234";

if ( $value === (string)intval($value) ) {

Looking back at the OP's request and after a little further searching, 
it seems that there might be a better possible solution for what the OP 
is requesting.

<?php

$values = array("asdf1234", "123.123", "123");

foreach ( $values AS $value ) {

   echo $value;

   if ( ctype_digit($value) ) {
     echo ' - is all digits';
   } else {
     echo ' - is NOT all digits';
   }
   echo '<br />'.PHP_EOL;
}

returns...

asdf1234 - is NOT all digits
123.123 - is NOT all digits
123 - is all digits

http://www.php.net/manual/en/function.ctype-digit.php

An important note:

This function expects a string to be useful, so for example passing in 
an integer may not return the expected result. However, also note that 
HTML forms will result in numeric strings and not integers. See also the 
types section of the manual.

--
Jim