(18 votes, average: 3.72 out of 5)How to check for number values only and block or convert letter strings to integers.
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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is_numeric has problem
just input 345345e45 watch "e" in the middle w' means power i think it accept this as an i/p of numbers
thanks.
132131
232133
Thank very much dear it solve my great problem.
If you want to convert ‘(555) 555-5555′ to ’5555555555′, for example, use this:
$phone_number_as_string = '(555) 555-5555';
// Outputs '(555) 555-5555'
$phone_number_as_integer = preg_replace("/[^0-9]/", "", $phone_number_as_string);
// Outputs 5555555555
If you want to reformat your phone number into a different string, as ’555-555-5555′, for example, use this:
// Regular Expression
$phone_number_as_integer_template = '/([0-9]{3})([0-9]{3})([0-9]{4})/';
// Split phone number into array of 3 parts (phone_number_fields) 1/2/3 ('0' is all matches)
preg_match($phone_number_as_integer_template, $phone_number_as_integer, $phone_number_fields);
// Use these three parts to re-construct the phone number (separated by dashes)
$phone_number_formatted = $phone_number_fields[1] . '-' . $phone_number_fields[2] . '-' . $phone_number_fields[3];
print $phone_number_formatted;
// Outputs '555-555-5555'
I think “ctype_digit” this function help you ….
To blindly block non-numeric characters just cast the input as an int.
$input = (int) $_GET['int'];
also, +1 for ctype_digit().