generation image php depuis webcam

<?php
header("content-type: image/jpeg");
if ($_post["tab"]) {
$lv=$_post['tab'];
$temp=explode(",",$lv);
settype($temp[1],'integer');
$sortie = imagecreatetruecolor(160,120);
$k=0;
for($i=0;$i<120;$i++){
 for($j=0;$j<160;$j++){
   imagesetpixel($sortie,$j,$i,$temp[$k]);
   $k++;
}
}

$perso = doquery("select login,id,photo from {{table}} where id='" . $_session['id'] . "' ", 'perso');
$rowperso = mysql_fetch_assoc($perso);

$lien = ''.$rowperso['login'].'';
$couleur_texte = imagecolorallocate($sortie, 255, 255, 255);
imagestring($sortie, 1, 1, 110, $lien, $couleur_texte);
imagejpeg($sortie,"",100);

// on décode l'image encodée en base64 avec flex
    $img_data = ($_post["tab"]);
$perso = doquery("select login,id,photo from {{table}} where id='" . $_session['id'] . "' ", 'perso');
$rowperso = mysql_fetch_assoc($perso);
    $img_filename = '/*/*/www/photos/'.$rowperso['login'].'.jpg';
    // on enregistre l'image
    $img_file = fopen($img_filename, "w") or die("can't open file");
    fwrite($img_file, $img_data);
    fclose($img_file);
	
$query = "update * set photo='".$rowperso['login']."' where login='".$rowperso['login']."'";
$result = mysql_query($query);
imagedestroy($sortie);

	}
?>