Afronden op tientallen of hondertallen

		$xxx = rand(1,100);
		if($xxx < 20){$omvang = rand(5,100);}
		if($xxx > 19 || $xxx < 50){$omvang = rand(100,1000);}
		if($xxx > 49 || $xxx < 70){$omvang = rand(1000,2000);}
		if($xxx > 69 || $xxx < 80){$omvang = rand(2000,3000);}
		if($xxx > 79 || $xxx < 90){$omvang = rand(3000,5000);}
		if($xxx > 89){$omvang = rand(4000,10000);}
		
		// Afronden op tientallen
		function omhoogTientallen($omvang)
		{
		  return ceil($omvang/1)*10;
		}

$xxx = rand(1,100);
		if($xxx < 20){$omvang = rand(5,100);}
		if($xxx > 19 || $xxx < 50){$omvang = rand(100,1000);}
		if($xxx > 49 || $xxx < 70){$omvang = rand(1000,2000);}
		if($xxx > 69 || $xxx < 80){$omvang = rand(2000,3000);}
		if($xxx > 79 || $xxx < 90){$omvang = rand(3000,5000);}
		if($xxx > 89){$omvang = rand(4000,10000);}
 
		// Afronden op tientallen
		function omhoogTientallen($omvang)
		{
		  return ceil($omvang/1)*10;
		}

<?php
echo round(3.4);         // 3
echo round(3.5);         // 4
echo round(3.6);         // 4
echo round(3.6, 0);      // 4
echo round(1.95583, 2);  // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2);    // 5.05
echo round(5.055, 2);    // 5.06
?>

<?php
echo round(3.4);         // 3
echo round(3.5);         // 4
echo round(3.6);         // 4
echo round(3.6, 0);      // 4
echo round(1.95583, 2);  // 1.96
echo round(1241757, -3); // 1242000
echo round(5.045, 2);    // 5.05
echo round(5.055, 2);    // 5.06
?>

$precision = 10;
echo round(123456/$precision)*$precision;

$precision = 10;
echo round(123456/$precision)*$precision;