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  1. <?php
  2.     $inputArr = array(
  3.         "0", 
  4.         "0.1",
  5.         " 0.1 ",
  6.         "0,00002",
  7.         "123.456",
  8.         "12345678",
  9.         "12345678.9999",
  10.         "123456789",
  11.         "123456789.0001"
  12.     );
  13.  
  14.     $pattern = "~^\s*\d{1,8}(?:\.\d{1,4})?\s*$~";
  15.     forEach($inputArr as $input) {
  16.         $match = ($input > 0) && preg_match($pattern, $input);
  17.         echo("Input: '" . $input . "'  ->  " . ($match ? "TRUE" : "FALSE") . "\n");
  18.     }
  19. ?>
Success #stdin #stdout 0.01s 20520KB
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Input: '0'  ->  FALSE
Input: '0.1'  ->  TRUE
Input: ' 0.1 '  ->  TRUE
Input: '0,00002'  ->  FALSE
Input: '123.456'  ->  TRUE
Input: '12345678'  ->  TRUE
Input: '12345678.9999'  ->  TRUE
Input: '123456789'  ->  FALSE
Input: '123456789.0001'  ->  FALSE
https://ideone.com/1OVByA
Illustration of answer to http://stackoverflow.com/questions/16511461/how-to-ensure-user-submitted-numeric-input-follows-a-certain-format.
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
secret

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