[PHP]Invalid argument supplied for foreach()

$html .= <<<END
 <form method=POST action='$_SERVER[PHP_SELF]' name=form_projet id=form_projet >
                <input type=hidden name=Action value="tch">
                <input type=hidden name=Etape value="multiple">
                <input type=hidden name=prj_id value="$r[prj_id]">
    
END;
	
	while ( $r = dbiFetch($q))
	{ 
	$html .="<input type=checkbox name='coche[]' value='$r[prj_id]' >"."<a href='$PHP_SELF?Action=tch&Etape=reporting&prj_id=$r[prj_id]'>"."<b>".($r['label1'].$r['label2'])."</b>"."</a>"."<br />";
	}
	
    
$html .= <<<END
	
       <br />
       <input type=submit value='Reporting'>
	   </form>

$sql  = " select distinct prj_id,concat(k2people.rs,'› ') as label1 ,prj_nom as label2 ,'',prj_status";
    $sql .= " from k2prjproject left join k2people on prj_kid = kid";
    $sql .= " left join k2prjwork on prj_id = wrk_prj_id";
    $sql .= " where 1";
    $sql .= " and prj_status != 'ferme'";
    $sql .= " order by prj_status,k2people.rs,prj_nom,wrk_date DESC" ;
	$sql .= " limit 0, 10";
	$q = dbiQuery($sql);
	if (! $q ) DbError($sql);

$html .= <<<END
 <form method=POST action='$_SERVER[PHP_SELF]' name=form_superviseur id=form_superviseur >                <input type=hidden name=Action value="tch">
                <input type=hidden name=Etape value="multiple">
                <input type=hidden name=prj_id value="$r[prj_id]">
    
END;
	
	while ( $r = dbiFetch($q))
	{ 
	//$b = "<a href='$PHP_SELF?Action=tch&Etape=reporting&prj_id=$r[prj_id]'>"."<b>".$r[label1] ." : ".$r[label2]."</b>"."<br />"."</a>";
	//$html .= "<input type=checkbox name='coche[]' value=$r[prj_id]>$b<br />";
	$html .="<input type=checkbox name='coche[]' value='$r[prj_id]' >"."<a href='$PHP_SELF?Action=tch&Etape=reporting&prj_id=$r[prj_id]'>"."<b>".($r['label1'].$r['label2'])."</b>"."</a>"."<br />";
	}
	
    
$html .= <<<END
	
       <br />
       <input type=submit value='Reporting'>
	   </form>

function tachReportingMultiple($prj_id)
{
foreach($_REQUEST['coche'] as $key =>$prj_id)    
{ 
$sql  = " select k2people.kid as kid,k2prjproject.*,date_format(prj_debut,'%d/%m/%Y') as prj_debut,date_format(prj_fin,'%d/%m/%Y') as prj_fin,k2prjtypeproject.*,k2people.rs as cli_rs, k2people.nom as cli_nom, k2people.prenom as cli_prenom, k2people.email as cli_email, k2people.tel as cli_tel, k2people.fax as cli_fax";
	$sql .= " from (k2prjproject left join k2people on prj_kid = k2people.kid) left join k2prjtypeproject on prj_typ_id = typ_id";	
	$sql .= " where prj_id = '$prj_id'"; 
	$q = dbiQuery($sql);
    if (! $q ) DbError($sql);
    $R = dbiFetch($q);

$tab_html .= <<< END

 <table cellpadding=0 cellspacing=0 width=100%>
 <tr>
    <td valign=top class=BG5 width=35%>
      <u><b>Projet</b></u><br><br>
      <table cellpadding=0 cellspacing=0 >
        <tr><td>Projet &nbsp; </td><td><b>$R[typ_label] : $R[prj_nom]</b></td></tr>
        <tr><td>Client &nbsp;</td><td><b>$cli_rs : $R[cli_prenom] $cli_nom</b></td></tr>
        <tr><td>Durée &nbsp; </td><td>$barre</td></tr>
        <tr><td>email &nbsp;</td><td><b><a href="mailto:$R[cli_email]">$R[cli_email]</a></b></td></tr>
        <tr><td>Tel &nbsp;</td><td><b>$R[cli_tel]</b></td></tr>
        <tr><td>Fax &nbsp;</td><td><b>$R[cli_fax]</b></td></tr>
      </table>
    </td>
    <td valign=top class=BG3 width=65%>
    <u><b>Taches</b></u><br><br>
END;


        $tab_html .= <<<END
      <table cellpadding=0 cellspacing=0 border=1 width=100% >
      <form method=post name=form_work$i id=form_work$i action='$_SERVER[PHP_SELF]'>
  
      <input type=hidden name=Action value="tch">
      <input type=hidden name=Etape value="validerSuiviDeveloppeur2">
      <input type=hidden name=prj_id value="$prj_id">
      <input type=hidden name=wrk_date$i value="$date_formate">
      <input type=hidden name=wrk_id$i  value="$R[wrk_id]">
      <input type=hidden name=wrk_usr_id$i value="$usr_id">
      <input type=hidden name=tache_id$i  value="$tache_id">
      
      
      <tr>
      <th colspan="3" rowspan="4" width=30%>Tache$i</th>
      <td width=30%>Temps&nbsp;estimé :</td><td><b>$time_estime2</b></td>
      </tr><tr>
      <td width=30%>Temps&nbsp;travaillé&nbsp; :</td><td><b>$time4</b></td>
      </tr><tr>
      <td width=30%>Etat :</td><td><b>$r4[tache_etat]</b></td>
      </tr><tr>
      <td>Auteur :</td><td><b>$r4[nick]</b></td>
      </tr> 
      <tr>
      <td colspan=5 class=BG5><input type=button value='reporting' onclick = "report('reporting$tache_id')"></td>
      </tr>
      <tr>
      <td  colspan=5>
      <div style=display:none id=reporting$tache_id width=100%>
           
      <textarea  name=wrk_com$i style='height:80px;width:100%'></textarea>
      Temps : <input name=wrk_time$i style='text-align:center;width:50px'><br>      
      Etat  :  $etat<br/><br />
      <input type=submit value='Valider'>
      </div>
      </td>
      </tr>     
      </tr>
      </form>
      </table>
END;