Question: How to validate number values to and block all letters and symbol in a form.

Answer: You can check the value or convert the value to an integer (number).

1) Check a value using is_int() to finds whether the given variable is an integer

<?
if(is_int($variable))
echo "Pass test";
else
echo "Please use only numbers";
?>

2) Note: To test if a variable is a number or a numeric string (such as form input, which is always a string), you must use is_numeric().

<?
if(is_numeric($variable))
echo "Pass test";
else
echo "Please use only numbers";
?>

3) Convert the value to an integer (number) using settype.

<?php
$foo = "5bar"; // string
$bar = true; // boolean

settype($foo, “integer”); // $foo is now 5 (integer)
settype($bar, “string”); // $bar is now “1″ (string)
?>

or you can use int to do the trick.


<?
$int=593; // $int is a integer
$int.=""; // $int is now a string
?>


my_number = “12587654325″;

// array in sections of 3 to separate with commas
trace(my_number);
var dollar_array:Array = new Array();
var start:Number;
var end:Number = my_number.length;
trace(my_number.length);
while (end > 0) {
trace(end);
start = Math.max(end – 3, 0);
dollar_array.unshift(my_number.slice(start, end));
end = start;
}

// assign a comma delimited value from dollar_array
my_number = dollar_array.join(“,”);
trace(my_number);

Introduction:

I was having a problem trying to split a string of multiple lines from an online form using the flowing code:

<?php
   $arry_names = split("\n", $names);
?>

This was producing an unexpected line break. I searched the web to see if anyone had the same problem and found that I needed to check for “returns” (\r) also. So now when I’m splitting data by lines, I use the following code:

<?php
   $arry_names = split("[\n|\r]", $names);
?>