Shorthand to check value in array - php

Question

Is there a short way of doing this?
if ((isset($a['key']) && ($a['key'] == 'value')) {
echo 'equal';
// more code
}
else {
echo 'not equal';
// more code
}
I need to test lots of values on an array that can or cannot exist. I feel that this method is too verbose.
I could remove the isset() and mute the notices... but then I feel dirty.
Edit:
Answering Jack's question: "Could you give an example how you would test lots of values in an array?"
example:
if (isset($_GET['action']) && $_GET['action'] == 'view') {
//code
}
if (isset($_GET['filter']) && $_GET['filter'] == 'name') {
//code
}
if (isset($_GET['sort']) && $_GET['sort'] == 'up') {
//code
}
if (isset($_GET['tag']) && $_GET['tag'] == 'sometag') {
//code
}
etc...

Answer 1

For anyone still stumbling upon this question...
You could use PHP's coalescing operator:
if (($a['key'] ?? '') === 'value') {
echo 'equal';
// more code
}
else {
echo 'not equal';
// more code
}
See this question: using PHP's null coalescing operator on an array

Answer 2

I don't like to answer my own questions but I feel that the best and cleaner way to do this kind of checkings is to write a "helper funcion" like:
function iskeyval(&$a, $k, $v) {
return isset($a['key']) && ($a['key'] == 'value');
}
and then:
if (iskeyval($a, 'key', 'value')) {
...
}
else {
...
}

Answer 3

I have added comments to explain the code. Here is the code :
//this array maps the function with the get parameters
$functions = array (
"action" => "do_actions" ,
"filter" => "do_filters"
);
foreach ($_GET as $key=>$value) {
//check if this field is corresponding functions or not
if ( array_key_exists($key , $functions) ) {
call_user_func($functions[$key] , $key,$value);
}
}
function do_actions ($key , $value) {
//place your code here to play with this value
echo 'do_actions is called with ' . $key . 'and' . $value . "</br>";
}
function do_filters ($key , $value) {
//place your code here to play with this value
echo 'do_filters is called with ' . $key . ' and ' . $value . "</br>";
}
?>

Answer 4

$list = array(
0 => 'one',
1 => 'two',
2 => 'one',
3 => 'three',
4 => 'one',
);
if( #$list['xxx'] !== 'three')
echo 'Not ';
echo 'Equal';
Suppress the error reporting.