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
?>
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