PHP implements a method of dividing a string by a specified distance _php tips

The example in this article describes the method by which the PHP implementation splits a string at a specified distance. Share to everyone for your reference. Specifically as follows:

Adding a comma to every three characters of a string, such as converting the string 1234567890 to 1,234,567,890, is a common practice in the financial world

<?php
/**
 * Every 3 characters, separated by commas
 * @param string $str
 * @return string/
function Splitstrwithcomma ($str)
{
  $arr = array ();
  $len = strlen ($STR);
  for ($i = $len-1; $i >= 0;) {
    $new _str = "";
    for ($j = $i; $j > $i-3 && $j >= 0; $j-) {
      $new _str. = $str [$j];
    }
    $arr [] = $new _str;
    $i = $j;
  }
  $string = Implode (', ', $arr);
  Flip the string yourself to implement
  //$string = Strrev ($string);
  for ($i = 0, $j = strlen ($string)-1; $i <= $j; $i + +, $j-) {
    $tmp = $string [$i];
    $string [$i] = $string [$j];
    $string [$j] = $tmp;
  }
  return $string;
}
$str = "1234567890";
$new _str = Splitstrwithcomma ($STR);
Echo $new _str. "\ n";

I hope this article will help you with your PHP program design.