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

php arrays array-push
Marc picture Marc · Apr 10, 2012 · Viewed 92.9k times · Source

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);
}

Answer

Rocket Hazmat picture Rocket Hazmat · Apr 10, 2012

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 ==.

Related questions

array_push for associative arrays

I'm trying to extend an assoc array like this, but PHP doesn't like it. I receive this message: Warning: array_push() expects parameter 1 to be array, null given Here's my code: $newArray = array(); foreach ( $array as $key => $value ) { $array[$…

Read More
Array push with associate array

If I am working with an associate array like such: Array ( [Username] => user [Email] => email ) and I want to add an element to the end, I would think to do: array_push($array, array('Password' => 'pass')); However, …

Read More
dynamically inserting value to array with index

Pushing values to an array caused the index to start with 0 if the index were any other values except starting from 0. $a=array("a"=>"Dog","b"=>"Cat"); array_push($a,"Horse","Bird"); this will insert Horse and Bird …

Read More