Numeric abbreviation

numeric_abbr.php

<?php

/* this turns numbers like 45000 into 45K */

print "0=" . numeric_abbr(0) . "\n\n";
print "9=" . numeric_abbr(9) . "\n\n";
print "10=" . numeric_abbr(10) . "\n\n";
print "100=" . numeric_abbr(100) . "\n\n";
print "999=" . numeric_abbr(999) . "\n\n";
print "1000=" . numeric_abbr(1000) . "\n\n";
print "9999=" . numeric_abbr(9999) . "\n\n";
print "10000=" . numeric_abbr(10000) . "\n\n";
print "99999=" . numeric_abbr(99999) . "\n\n";
print "100000=" . numeric_abbr(100000) . "\n\n";
print "999999=" . numeric_abbr(999999) . "\n\n";
print "1000000=" . numeric_abbr(1000000) . "\n\n";
print "1000000000=" . numeric_abbr(1000000000) . "\n\n";
print "12345.6789=" . numeric_abbr(12345.6789) . "\n\n";

function numeric_abbr($value) {
  $is_negative = $value < 0;
  $value = abs($value);
  $abbr = '';
  
  if ( $value >= 1000 ) {  
    $ranges = array(5 => 'K', 8 => 'M', 11 => 'T', 14 => 'Q');
    $power = floor(log($value, 10));
    foreach ($ranges as $cutoff => $this_abbr) {
      if ( $power <= $cutoff ) {
        $abbr = $this_abbr;
        $divisor = pow(10, $cutoff - 2);
        $value = $value / $divisor;
        $matches = array();
        if ( strlen((string) $value) > 3 && preg_match('/(\d*\.\d)\d*/', (string) $value, $matches) ) {
          $value = $matches[1];
        }
        break;
      }
    }
  }
  if ( $is_negative ) {
    $value *= -1;
  }
  return $value . $abbr;
}

?>