Unset associative array by value

Question

I'd like to remove an array item by value. Key cannot be specified. Here is the array. I have sorted the array by value, numeric descending.

Array
(
    [this] => 15
    [that] => 10
    [other] => 9
    [random] => 8
    [keys] => 4
)

If I want to unset all items that have a value less than 10. How do I do that?

Answer 1

使用array_filter函数：

$a = array_filter($a, function($x) { return !($x < 10); });

Answer 2

foreach($array as $key => $value)
  if( $value < 10 )
    unset($array[$key])

Answer 3

Assuming that all values are ints:

for (i=9;i>=0;i--)
{
    while (array_search($i, $assocArray) !== false)
    {
        unset($assocArray[array_search($i, $assocArray)]);
    }
}

There probably are more elegant ways of doing this, but fever has a firm grip on my brain :)

knittl's answer is correct, but if you're using an older version of PHP, you can' t use the anonymous function, just do:

function filterFunc($v)
{
    return $v >= 10;
}
$yourArray = array_filter($yourArray,'filterFunc');

Credit to Knittl

Answer 4

$test = array(
    "this" => 15,
    "that" => 10,
    "other" => 9,
    "random" => 8,
    "keys" => 4
);

echo "pre: ";print_r($test);
pre: Array ( [this] => 15 [that] => 10 [other] => 9 [random] => 8 [keys] => 4 )

Run this code:

foreach($test AS $key => $value) {
    if($value <= 10) {
        unset($test[$key]);
    }
}

Results are:

echo "post: ";print_r($test);
post: Array ( [this] => 15 )