check if array key exists code example
Example 1: php key exists
$fruits = ['apple', 'pear', 'banana'];
if (array_key_exists("banana", $fruits)) {
}
$exists = array_key_exists("peach", $fruits);
Example 2: php array index exists
$fruits = ['apple', 'pear', 'banana'];
if (array_key_exists("banana", $fruits)) {
}
$exists = array_key_exists("peach", $fruits);
return array_key_exists("pineapple", $fruits);
Example 3: javascript does key exist
var person={"name":"Billy","age":20}
person.hasOwnProperty("name");
person.hasOwnProperty("sex");
Example 4: keys of array exist in array
function findKey($array, $keySearch)
{
foreach ($array as $key => $item) {
if ($key == $keySearch) {
echo 'yes, it exists';
return true;
} elseif (is_array($item) && findKey($item, $keySearch)) {
return true;
}
}
return false;
}