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PHP : Function Reference : Array Functions : range

range

Create an array containing a range of elements (PHP 4, PHP 5)
array range ( mixed low, mixed high [, number step] )

Example 319. range() examples

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<?php
// array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
foreach (range(0, 12) as $number) {
   echo $number;
}

// The step parameter was introduced in 5.0.0
// array(0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100)
foreach (range(0, 100, 10) as $number) {
   echo $number;
}

// Use of character sequences introduced in 4.1.0
// array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i');
foreach (range('a', 'i') as $letter) {
   echo $letter;
}
// array('c', 'b', 'a');
foreach (range('c', 'a') as $letter) {
   echo $letter;
}
?>

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Code Examples / Notes » range

donwilson
To speed your MyRange() function, I have created a much nicer function with less code to sift through to include the step parameter.
<?php
// range() limitation for PHP <5.0.0
function myRange($num1, $num2, $step=1)
{
for($i = $num1; $i <= $num2; $i += $step)
{
$temp[] = $i;
}

return $temp;
}
?>
For whatever reason my comment was deleted..?

derek
This should emulate range() a little better.
<?php
function range_wroar($low, $high, $step = 1) {
$arr = array();
$step = (abs($step)>0)?abs($step):1;
$sign = ($low<=$high)?1:-1;
if(is_numeric($low) && is_numeric($high)) {
//numeric sequence
for ($i = (float)$low; $i*$sign <= $high*$sign; $i += $step*$sign)
$arr[] = $i;
} else {
//character sequence
if (is_numeric($low))
return $this->range($low, 0, $step);
if (is_numeric($high))
return $this->range(0, $high, $step);
$low = ord($low);
$high = ord($high);
for ($i = $low; $i*$sign <= $high*$sign; $i += $step*$sign) {

$arr[] = chr($i);
}
}
return $arr;
}
?>

forrester
Since users of < PHP 5.0.0 don't have the option of the step parameter, I've created a little function to account for it:
@USAGE: (int low, int high [, int step])
function myRange($low,$high,$step=1)
{
$ranArray = range($low,$high);
$step--;
$keys = count($ranArray);
for($i=0;$i<$keys;$i++)
{
$retArray[] = $ranArray[$i];
$i = $i + $step;
}
return $retArray;
}
// Example usage:
print_r(myRange(1,11,2));
// Returns the array:
// [0] => 1
// [1] => 3
// [2] => 5
// [3] => 7
// [4] => 9
// [5] => 11

emory underscore smith
since its not stated explicitly above, thought id point out that you arent limited to using integers.
however, be careful when doing so, as you might not get the range you expect!
to illustrate:
<?php
$am = range(500,1600,10);
$fm = range(88.1,107.9,.2);
print_r($am);
print_r($fm);
?>
print_r($am) yields the expected result:
           
Array
(
   [0] => 500
   [1] => 510
   [2] => 520
   ...
   [109] => 1590
   [110] => 1600
)
print_r($fm), however, falls a bit (1%) short:
Array
(
   [0] => 88.1
   [1] => 88.3
   [2] => 88.5
   ...
   [97] => 107.5
   [98] => 107.7
)
   
so, if you want to use a non-integral step size params for numeric ranges, be sure to account for fp representation accuracy and error accumulation; a step size of something like pi or 1/10 could spell disaster for a large range. if in doubt, use integral steps and divide ... something like <?php range(88.1,108,.2) ?> might work to recover 107.9, but would not be scalable like, say <?php array_map(create_function('$x','return $x/10;'),range(881,1079,2)) ?>.
-emory

chris
Quick HTML menus with minimum and maximum sets of years:
<?php
/*
** Quick HTML menus with minimum and maximum sets of years.
** @author Chris Charlton <chris@laflash.org>
** @license FREE!
*/
// Years range setup
$year_built_min = 1900;
$year_built_max = date("Y");
?>
<select id="yearBuiltMin" size="1">
<?php // Generate minimum years
foreach (range($year_built_min, $year_built_max) as $year) { ?>
<option value="<?php echo($year); ?>"><?php echo($year); ?></option>
<?php } ?>
</select>
<select id="yearBuiltMax" size="1">
  <?php // Generate max years
foreach (range($year_built_max, $year_built_min) as $year) { ?>
<option value="<?php echo($year); ?>"><?php echo($year); ?></option>
<?php } ?>
</select>

j dot gizmo
i figured i'd add some more functionality to the myRange() functions below.
now you can, besides giving a $step parameter,
1. count backwards
2. count with letters
3. give whatever parameter you want, there's nothing (i know of) that will cause an endless loop (try a negative $step for the previous function....)
<?php
function myRange($num1, $num2, $step=1)
{
if (is_numeric($num1) && is_numeric($num2))
{
//we have a numeric range
$step = ( abs($step)>0 ? abs($step) : 1 ); //make $step positive
$dir = ($num1<=$num2 ? 1 : -1); //get the direction
for($i = (float)$num1; $i*$dir <= $num2*$dir; $i += $step*$dir)
{
$temp[] = $i;
}
}
else
{
//we have a character range
$num1=ord((string)$num1); //convert to ascii value
$num2=ord((string)$num2);
$step = ( abs($step)>0 ? abs($step) : 1 ); //make $step positive
$dir = ($num1<=$num2 ? 1 : -1); //get direction
for($i = $num1; $i*$dir <= $num2*$dir; $i += $step*$dir)
{
$temp[] = chr($i);
}
}
return $temp;
}
print_r(myRange( 1, 3, 0.5 )); //you can use fractional steps
print_r(myRange( "a", "k", 3 )); //or count letters
print_r(myRange( "5", "9" )); //numbers are detected even if hidden in strtings
print_r(myRange( "!", "%", 1/pi() )); //or mess around with senseless parameters
?>

m0sh3
Here's how i use it to check if array is associative or not:
<?php
if (array_keys($arr)===range(0, sizeof($arr)-1)) {
// not associative array
} else {
// associative array
}
?>

subscription101
A much simpler way of creating a range of even numbers is by starting with an even number:
<?php
   range(2, 10, 2);
?>

manuel
<?php
function srange ($s) {
 preg_match_all("/([0-9]{1,2})-?([0-9]{0,2}) ?,?;?/", $s, $a);
 $n = array ();
 foreach ($a[1] as $k => $v) {
   $n  = array_merge ($n, range ($v, (empty($a[2][$k])?$v:$a[2][$k])));
 }
 return ($n);
}
$s = '1-4 6-7 9-10';
print_r(srange($s));
?>
Return:
Array
(
   [0] => 1
   [1] => 2
   [2] => 3
   [3] => 4
   [4] => 6
   [5] => 7
   [6] => 9
   [7] => 10
)

phpbug
<?php
foreach (range('A', 'z') as $letter) {
 echo $letter;
}
?>
yields:
ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz

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