php array_push() -> How not to push if the array already contains the value

I am using the following loop to add items to an an array of mine called $liste. I would like to know if it is possible somehow not to add $value to the $liste array if the value is already in the array? Hope I am clear. Thank you in advance.

$liste = array();
foreach($something as $value){
     array_push($liste, $value);
}

You check if it's there, using in_array, before pushing.

foreach($something as $value){
    if(!in_array($value, $liste, true)){
        array_push($liste, $value);
    }
}

The ,true enables "strict checking". This compares elements using === instead of ==.

Two options really.

Option 1: Check for each item and don't push if the item is there. Basically what you're asking for:

foreach($something as $value) {
    if( !in_array($value,$liste)) array_push($liste,$value);
}

Option 2: Add them anyway and strip duplicates after:

foreach($something as $value) {
    array_push($liste,$value);
}
$liste = array_unique($liste);

By the look of it though, you may just be looking for $liste = array_unique($something);.

As this question is using not the best practice code to begin with - I find all the answers here to be over-complicated.

Solving code in question:

Basically what is tried to do in question itself is filtering out repetitions. Better approach:

$liste = array_unique($something);

If adding elements to an array that is not empty:

$liste = array_unique(array_merge($liste, $something));

If you are using array_push():

Unless you are actually using return value of array push you should really use:

$liste[] = $value;

for shorter syntax and minor performance increase

maybe you want to use it as an associative array instead. it's implemented as (something like) a hash table, so you get constant insert time instead of linear.

function find_uniq( $something ) {
    foreach($something as $value){
         $liste[$value]++;
    }
    return array_keys( $liste );
}

The right answer is much simpler. Push everything, but then use array_unique() function:

array_push($array, $new_member);
$array = array_unique($array);