- print_r: documentation ( source)
<?php
$a = array();
$b = array();
$c = array();
for ($x=1,$n=0;$x<20;$x=$x+3) {
$a[] = $x;
$b[] = $x+1;
$c[] = $x+2;
//$x = $x+3;
}
print_r($a);
echo "\n\n";
print_r($b);
echo "\n\n";
print_r($c);
echo "\n\n";