PHP仅允许带有2位小数的数字

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

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.