Short Number Formatter for PHP (1000 to 1k; 1m; 1b; 1t)

short-number-format.php

<?php

// Converts a number into a short version, eg: 1000 -> 1k
// Based on: http://stackoverflow.com/a/4371114
function number_format_short( $n, $precision = 1 ) {
	if ($n < 900) {
		// 0 - 900
		$n_format = number_format($n, $precision);
		$suffix = '';
	} else if ($n < 900000) {
		// 0.9k-850k
		$n_format = number_format($n / 1000, $precision);
		$suffix = 'K';
	} else if ($n < 900000000) {
		// 0.9m-850m
		$n_format = number_format($n / 1000000, $precision);
		$suffix = 'M';
	} else if ($n < 900000000000) {
		// 0.9b-850b
		$n_format = number_format($n / 1000000000, $precision);
		$suffix = 'B';
	} else {
		// 0.9t+
		$n_format = number_format($n / 1000000000000, $precision);
		$suffix = 'T';
	}

  // Remove unecessary zeroes after decimal. "1.0" -> "1"; "1.00" -> "1"
  // Intentionally does not affect partials, eg "1.50" -> "1.50"
	if ( $precision > 0 ) {
		$dotzero = '.' . str_repeat( '0', $precision );
		$n_format = str_replace( $dotzero, '', $n_format );
	}

	return $n_format . $suffix;
}

/*
Example Usage:

number_format_short(7201); // Output: 7.2k

Demo:
echo '<table>';
for($d = 0; $d < 16; $d++ ) {
	$n = intval("09" . str_repeat( "0", $d ));
	$n = $n / 10;
	echo number_format_short($n) .'<br>'; // 0.9

	$n = intval("1" . str_repeat( "0", $d ));
	echo number_format_short($n) .'<br>'; // 1.0

	$n = intval("11" . str_repeat( "0", $d ));;
	$n = $n / 10;
	echo number_format_short($n) .'<br>'; // 1.1
}
echo '</table>';

Demo Output:
0.9
1
1.1
 
9
10
11
 
90
100
110
 
0.9K
1K
1.1K
 
9K
10K
11K
 
90K
100K
110K
 
0.9M
1M
1.1M
 
9M
10M
11M
 
90M
100M
110M
 
0.9B
1B
1.1B
 
9B
10B
11B
 
90B
100B
110B
 
0.9T
1T
1.1T
 
9T
10T
11T
 
90T
100T
110T
 
900T
1,000T
1,100T
*/