Comments on: PHP: Validating Numeric Values and Digits http://davidwalsh.name/php-validatie-numeric-digits Legendary scribbles about JavaScript, HTML5, AJAX, PHP, CSS, and ∞. Wed, 23 May 2012 19:56:08 +0000 hourly 1 http://wordpress.org/?v=3.3.2 By: Allain Lalondehttp://davidwalsh.name/php-validatie-numeric-digits#comment-28986 Allain Lalonde Fri, 03 Feb 2012 15:33:46 +0000 http://davidwalsh.name/?p=783#comment-28986 Doesn't '/[0-9]+/' equate to contains or or more consecutive digits. For all, I think you probably need '/^[0-9]+$/' or more succinctly '/^\d+$/'.Kudos to Elkalidi Abdelkader for using them but it doesn't hurt to be explicit. Doesn’t ‘/[0-9]+/’ equate to contains or or more consecutive digits. For all, I think you probably need ‘/^[0-9]+$/’ or more succinctly ‘/^\d+$/’.

Kudos to Elkalidi Abdelkader for using them but it doesn’t hurt to be explicit.

]]> By: endryouhttp://davidwalsh.name/php-validatie-numeric-digits#comment-4216 endryou Tue, 16 Dec 2008 12:45:35 +0000 http://davidwalsh.name/?p=783#comment-4216 One important detail about ctype_digit: it accepts string as parameter. For example: ctype_digit('5') === true, but ctype_digit(5) === false. So it's safer to write ctype_digit((string)$my_fancy_var) but again not enough for nulls, booleans, objects or resources. One important detail about ctype_digit: it accepts string as parameter.
For example:
ctype_digit(’5′) === true, but ctype_digit(5) === false.
So it’s safer to write ctype_digit((string)$my_fancy_var) but again not enough for nulls,
booleans, objects or resources.

]]> By: Elkalidi Abdelkaderhttp://davidwalsh.name/php-validatie-numeric-digits#comment-3929 Elkalidi Abdelkader Mon, 24 Nov 2008 00:36:24 +0000 http://davidwalsh.name/?p=783#comment-3929 to check numeric variable and lenth of variable = 4 numbers:preg_match("#^[0-9]{4}$#",$variable)exemple : $year = preg_match("#^[0-9]{4}$#",$variable) ? $variable : date("Y");You can remplace {4} by {1,4} to check if variable is between 1 and 4 numbers to check numeric variable and lenth of variable = 4 numbers:

preg_match(“#^[0-9]{4}$#”,$variable)

exemple :
$year = preg_match(“#^[0-9]{4}$#”,$variable) ? $variable : date(“Y”);

You can remplace {4} by {1,4} to check if variable is between 1 and 4 numbers

]]> By: Davidhttp://davidwalsh.name/php-validatie-numeric-digits#comment-3924 David Sat, 22 Nov 2008 14:31:46 +0000 http://davidwalsh.name/?p=783#comment-3924 Actually you can use is_int() if your using the is_* functions. However Alex is right and the ctype functions are better. Actually you can use is_int() if your using the is_* functions. However Alex is right and the ctype functions are better.

]]> By: Alexhttp://davidwalsh.name/php-validatie-numeric-digits#comment-3923 Alex Sat, 22 Nov 2008 13:32:45 +0000 http://davidwalsh.name/?p=783#comment-3923 Josh, you can use the ctype php function :)(why my older post were deleted?) Josh, you can use the ctype php function :)

(why my older post were deleted?)

]]> By: Chrishttp://davidwalsh.name/php-validatie-numeric-digits#comment-3921 Chris Sat, 22 Nov 2008 01:01:48 +0000 http://davidwalsh.name/?p=783#comment-3921 You can use is_int() to find out if it's an integer instead of a regexp or having to compare using intval() (as suggested above). The only catch with this is that is must fit within the integer type range so you may still need to use a regexp if it's a really long number.And I'm a little confused why you'd wrap is_numeric() inside another function call when all the wrapper function does is return the value from is_numeric() You can use is_int() to find out if it’s an integer instead of a regexp or having to compare using intval() (as suggested above). The only catch with this is that is must fit within the integer type range so you may still need to use a regexp if it’s a really long number.

And I’m a little confused why you’d wrap is_numeric() inside another function call when all the wrapper function does is return the value from is_numeric()

]]> By: Rikkihttp://davidwalsh.name/php-validatie-numeric-digits#comment-3918 Rikki Fri, 21 Nov 2008 19:16:31 +0000 http://davidwalsh.name/?p=783#comment-3918 Why would you create a new function that returns is_numeric, given that your new function name is longer than typing 'is_numeric' anyway? Why would you create a new function that returns is_numeric, given that your new function name is longer than typing ‘is_numeric’ anyway?

]]> By: Brenley Dueckhttp://davidwalsh.name/php-validatie-numeric-digits#comment-3916 Brenley Dueck Fri, 21 Nov 2008 18:25:16 +0000 http://davidwalsh.name/?p=783#comment-3916 I have definitely have seen people misuse the is_numeric function as well.@david - a regex tutorial would be great. You can always learn something new... I have definitely have seen people misuse the is_numeric function as well.

@david – a regex tutorial would be great. You can always learn something new…

]]> By: Brianhttp://davidwalsh.name/php-validatie-numeric-digits#comment-3915 Brian Fri, 21 Nov 2008 18:05:16 +0000 http://davidwalsh.name/?p=783#comment-3915 You could also use PHP's built-in function ctype_digit() which will return true only if all characters in the value it is passed are numeric. i.e. 1234 would return true, 1,234 returns false, 1.234 returns false. You could also use PHP’s built-in function ctype_digit() which will return true only if all characters in the value it is passed are numeric. i.e. 1234 would return true, 1,234 returns false, 1.234 returns false.

]]> By: Joshhttp://davidwalsh.name/php-validatie-numeric-digits#comment-3912 Josh Fri, 21 Nov 2008 17:10:25 +0000 http://davidwalsh.name/?p=783#comment-3912 why not just check if it's an integer and if it's a string of numbers just check if intval($num) == $num ? I tend to stray away from regex if possible. why not just check if it’s an integer and if it’s a string of numbers just check if intval($num) == $num ? I tend to stray away from regex if possible.

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