Iteration with javascript array in PHP

Question

I have an array in Javascript with a list of blocks. This array may change his length. I must to access it from PHP because I must to do some operations in my database. The problem is lenght of this array may change. This is the code:

<html>
<head>
</head>
<body>
<script type='text/javascript'>
  var blocks = [
    { w: 500, h: 600 },
    { w: 300, h: 200 },
    { w: 150, h: 150 },
    { w: 150, h: 150 },
    { w: 200, h: 250 },
    { w: 100, h: 250 }
  ];

  order_blocks(blocks); //blocks are ordered and can be added new blocks

  //Next code is only to test
  for(var n = 0 ; n < blocks.length ; n++) {
    var block = blocks[n];
    if (block.fit) {
        var str1 = "Block " + (n+1) + ": (" + block.w + "," + block.h + ")";
        document.write(str1);
    }
  }
</script>
<?php
    if (!isset($_POST[numblocks]))
    {
        echo '<form action="'.$_SERVER[PHP_SELF].'" method=post name=pass>
                    <input type=hidden name=numblocks>
                    <input type=hidden name=block1_w>
                    <input type=hidden name=block1_h>
            </form>';
        echo '<script languaje="JavaScript">
                    document.pass.numblocks.value=blocks.length;
                    document.pass.block1_w.value=blocks[0].w;
                    document.pass.block1_h.value=blocks[0].h;
                    document.pass.submit();
            </script>';   
    }     
    echo '<br><br>There are '.$_POST["numblocks"].' Blocks<br>';
    echo 'Block 1 ('.$_POST["block1_w"].','.$_POST["block1_h"].')<br>';
?>
</body>
</html>

The process is:

Javascript: I create array blocks and apply order_blocks.
PHP: I pass Javascript variables with POST method.

In the code you can see I pass correctly the first element of the array, but I should do it iterating over the array.

I can't see any PHP code (at least trying to) "iterating over the array." — djot
– djot, Commented Sep 26, 2013 at 8:32
Correct djot. I don´t know how to iterate over the array in the php block. Sorry if I have not expressed well. — TuLKaRiS
– TuLKaRiS, Commented Sep 26, 2013 at 8:36
So may I help you with this? php.net/manual/en/control-structures.foreach.php — djot
– djot, Commented Sep 26, 2013 at 8:37
Yes it can help me, but my problem is that in the first pass I don´t know how many iteration I must to do because I don´t know the lenght of the array. — TuLKaRiS
– TuLKaRiS, Commented Sep 26, 2013 at 8:39

S.Thiongane · Accepted Answer · 2013-09-26 08:38:55Z

Replace this :

echo '<form action="'.$_SERVER[PHP_SELF].'" method=post name=pass>
                <input type=hidden name=numblocks>
                <input type=hidden name=block1_w>
                <input type=hidden name=block1_h>
        </form>';
echo '<script languaje="JavaScript">
                document.pass.numblocks.value=blocks.length;
                document.pass.block1_w.value=blocks[0].w;
                document.pass.block1_h.value=blocks[0].h;
                document.pass.submit();
        </script>';

with this (should work) :

echo '<form action="'.$_SERVER[PHP_SELF].'" method=post name=pass>
                <input type=hidden name="numblocks">
                <input type=hidden name="block1_w[]">
                <input type=hidden name="block1_h[]">
        </form>';
echo '<script language="text/javascript">
            for(var i = 0; i < blocks.length; i++) {
                document.pass.numblocks.value=blocks.length;
                document.pass.block1_w[i].value=blocks[i].w;
                document.pass.block1_h[i].value=blocks[i].h;

            }
        </script>';

Thanks mansoulx but it don't let me make the assigment document.pass.block1_w[i].value=blocks[i].w; — TuLKaRiS
– TuLKaRiS, Commented Sep 26, 2013 at 13:05

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