Delete from array help
I have a cookie which stores info in an array.
This is for a classifieds website, and wh开发者_JS百科enever users delete their 'ads' the cookie must also be removed of the ad which was deleted.
So I have this:
if (isset($_COOKIE['watched_ads'])){
$expir = time()+1728000;
$ad_arr = unserialize($_COOKIE['watched_ads']);
foreach($ad_arr as $val){
if($val==$id){ // $id is something like "bmw_m3_10141912"
unset($val);
setcookie('watched_ads', serialize($ad_arr), $expir, '/');
}
}
}
This doesn't work... any idea why? I think its a problem with the unset part... Also, keep in mind if there is only one value inside the array, what will happen then?
Thanks
You got two bugs here: 1) you unset the $val
instead of the array element itself. 2) You set the cookie within the loop to the unknown $ad_arr2
array.
foreach($ad_arr as $key => $val){
if($val==$id){ // $id is something like "bmw_m3_10141912"
unset($ad_arr[$key]);
}
}
setcookie('watched_ads', serialize($ad_arr), $expir, '/');
array_filter
seems appropriate:
$array = array_filter($array, create_function('$v', 'return $v != '.$id.';'));
You are correct that you are using unset incorrectly. The manual on unset states:
If a static variable is unset() inside of a function, unset() destroys the variable only in the context of the rest of a function. Following calls will restore the previous value of a variable.
When you use 'as' you're assigning the value of that array element to a temporary variable. You want to reference the original array:
foreach ($ad_arr as $key => $val)
...
unset($ad_arr[$key]);
...
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