php is number



so the function seems to return 'false' even if the form entry was aparently a number or numeric string. the solution is pretty simple and no subroutines or fancy operations are necessary to make the 'is_numeric' function usable for form entry checks: simply strip off all (invisible) characters that may be sent along with the  var_dump(ctype_digit(.)); bool(false) var_dump(ctype_digit(null)); bool(false) var_dump(ctype_digit("")); bool(false) ?> as you can see, the reason why using just ctype_digit() may not always work is because it only returns true when given a string as input given a number value and it returns false (which  mixed : mixed indicates that a parameter may accept multiple (but not necessarily all) types. return value: true if var_name is a number or a numeric string, false otherwise. value type: boolean. example: <?php $var_name=; $var_name="a"; $var_name=""; 

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the is_numeric() function in the php programming language is used to evaluate whether a value is a number or numeric string. numeric strings contain any number of digits, optional signs such as or , an optional decimal, and an optional exponential. therefore, .e is a valid numeric string. i use if(is_numeric($value) && $value > && $value == round($value, )){. to validate if a value is numeric, positive and integral. php.net/is_numeric. i don't really like ctype_digit as its not as readable as "is_numeric" and actually has less flaws when you really want to validate that a value is numeric. mai try is_numeric. finds whether the given variable is numeric. numeric strings consist of optional sign, any number of digits, optional decimal part and optional exponential part. thus .e is a valid numeric value. hexadecimal notation (xff) is allowed too but only without sign, decimal and 

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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 ) && floor( $val ) != $val; }. copy the following chunk of code into a php file and run it. you'll be surprised at the outcome: $t = ""; if( is_int($t ) ) { echo $t . " is an int!"; } else { echo $t . " is not an int!"; }. the problem is that is_int() thinks a string of numbers is a string, not an integer. the is_int() man page has an example illustrating  php | check if a number is prime. given a number, we need to check whether it is prime or not in php. general approach for prime check is discussed here. in this article we will learn about how to check if a number is prime or not in php. examples: input : output : not prime input : output : prime  core/lib/drupal/component/utility/number.php number. provides a form element for numeric input, with special numeric validation. properties: #default_value: a valid floating point number. #min: minimum value. #max: maximum value. #step: ensures that the number is an even multiple of step, offset by #min if specified.

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