Don't perform a loop when value is empty?

[completeamateur]

Hi,

 

I am running a loop to generate the meta tags for a page, but if the database contains no meta tags, php throws a warning...

 

Warning: Invalid argument supplied for foreach() in /Library/WebServer/Documents/villa4life/application/layouts/layout.phtml on line 6

 

foreach($this->metadata as $metadata)

 

Is there anyway to prevent this? TIA

[F1Fan]

<?php
$var = $this->metadata;
if (is_array($var)){
  foreach($var as $metadata)...

[Stooney]

<?php
if(is_array($this->metadata) && count($this->metadata)>0){
    foreach($this->metadata as $metadata){
        //Whatever happens
    }
}
?>

[gizmola]

you can check prior to the loop, by comparing $this->metadata to NULL, for example:

 

if ($this->metadata != null) {

    //Do your foreach

    //etc

 

You can also turn down the errorlevel so that it doesn't include warnings, if there's no particular logic concern.  Of course on a production server you should not have error reporting on anyways, as you will want to log errors instead.

[Acs]

if ($this->metadata)

run foreach

 

or if it returns a mixed value:

 

if (is_array($this->metadata))

run foreach

[completeamateur]

Cheers guys!