PHP Allow only numbers with 2 decimals - php

Question

I need a function to check if number have 2 decimals or not.
For example:
$number = '1.00'; // Valid
$number2 = '1'; // Not valid
$number3 = '1.000' //Not valid

Answer 1

You can check it like that:
$str = "1.23444";
print strlen(substr(strrchr($str, "."), 1));
You would have to convert your variable to a String, but this is not a big problem. Do it like that:
$d = 100.0/81.0;
$s = strval($d);

Answer 2

You can do something like this:
if(strlen(substr(strrchr($number, "."), 1)) == 2){
echo "valid";
}else{
echo "not valid";
}

Answer 3

Regex could be a solution since your numbers seem to be declared as strings.
Code :
<?php
$re = "/(\d\.\d{2})(?!\d)/";
$array_input = array('1.00', '1', '1.000');
foreach($array_input as $row)
{
if(preg_match($re, $row, $matches) == 0)
echo $row . " isn't a valid value with 2 decimals only. <br>";
else
echo $row . " is valid. <br>";
}
?>
Output :
1.00 is valid.
1 isn't a valid value with 2 decimals only.
1.000 isn't a valid value with 2 decimals only.

Answer 4

Why would you not just force them to have 2 decimals using something like this
$original = 2;
$float = number_format($number, 2);
// echo $float = 2.00
I guess if you need to enforce that a float only has 2 decimals you could do something like the following.
$numbers = array(2.453, 3.35, 2.53, 1.636);
foreach($numbers as $number) {
if(strpos($number, '.') !== false) {
if(strlen($parts[1]) == 2) {
echo $number .' is valid!';
} else {
echo $number .' is NOT valid!';
}
}
}
The above is one way to accomplish this but there are many others. You could use array_map or array_filter and you could also use math such as the following
$numbers = array(2.453, 3.35, 2.53, 1.636);
$valid_numbers = array_filter($numbers, function($number) { return strlen($number) - strpos($number, '.');

Answer 5

function check_decimals($input, $number_of_decimals)
{
if(strlen(substr(strrchr((string)$input, "."), 1)) == $number_of_decimals)
{
return TRUE;
}
else {
return FALSE;
}
}
check_decimals("1.000", 2);

Answer 6

This may be a solution using preg_match_all
$re = "/^\\d+(?:\\.\\d{2})?$/m";
$str = "1.00\n13333.55\n1.000";
preg_match_all($re, $str, $matches);
echo '<pre>';
print_r($matches);
echo '</pre>';
REGEX: https://regex101.com/r/nB7eC4/1
CODE: http://codepad.viper-7.com/49ZuEa