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I have a key stored in a variable like so:
$key = 4;
I tried to get the relevant value like so:
$value = $array[$key];
but it failed. Help.
658
If you have a value and want to find the key, use array_search() like this: $arr = array ('first' => 'a', 'second' => 'b', ); $key = array_search ('a', $arr); $key will now contain the key for value 'a' (that is, 'first' ).
If you want to access the key of an array in a foreach loop, you use the following syntax: foreach ($array as $key => $value) { ... }
PHP array_key_exists() Function The array_key_exists() function checks an array for a specified key, and returns true if the key exists and false if the key does not exist.
Use filter if you want to find all items in an array that meet a specific condition. Use find if you want to check if that at least one item meets a specific condition. Use includes if you want to check if an array contains a particular value. Use indexOf if you want to find the index of a particular item in an array.
Your code seems to be fine, make sure that key you specify really exists in the array or such key has a value in your array eg:
$array = array(4 => 'Hello There');
print_r(array_keys($array));
// or better
print_r($array);
Output:
Array
(
[0] => 4
)
Now:
$key = 4;
$value = $array[$key];
print $value;
Output:
Hello There
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