PHP - 带网址的列表编号

Question

example php like this:

  for ($i=1; $i<=20; $i++){
    $url = "http://example.org/12".$i."<br />";
    echo $url;
  }

i want output :

http://example.org/1201
http://example.org/1202
http://example.org/1203
http://example.org/1204
http://example.org/1205
http://example.org/1206
http://example.org/1207
http://example.org/1208
http://example.org/1209
http://example.org/1210
http://example.org/1211
http://example.org/1212
.......
http://example.org/1220

Thanks for everybody who can help me :D

Answer 1

You can use str_pad()

for ($i=1; $i<=20; $i++){
    $i = str_pad($i, 2, "0", STR_PAD_LEFT);
    $url = "http://example.org/12".$i."<br />";
    echo $url;
}

You can also use sprintf()

for ($i=1; $i<=20; $i++){
    $i = sprintf("%02d",$i);
    $url = "http://example.org/12".$i."<br />";
    echo $url;
}