What's the best method to return the corresponding array name (stone, kilogram, pound) from knowing just the acronym value (st, kg, lb)?
"weight" => [
"stone" => [
"acronym" => "st"
],
"kilogram" => [
"acronym" => "kg"
],
"pound" => [
"acronym" => "lb"
]
];
function name($array,$t){
foreach($array as $k=>$a){
if($a['acronym']===$t){return $k;}
}
}
You can use strtr(); (if its ok to change your array)
$converter = array(
'st' => 'stone',
'kg' => 'kilogram',
'lb' => 'pound',
);
echo strtr('st', $converter); // stone
A bit lengthy:
foreach($mainArray['weight'] as $key=>$value) {
if(is_array($value)) {
if(in_array($acronymValue, $value)) {
echo $key. "has the acronym value";
break;
}
}
}
Here is its working demo : Fiddle
$mainArray['weight']['stone']['something'] = 'kg'While question is already answered, Still I think to add a loop-less version using callback anonymous function.
function getData($arr, $needle)
{
$f = array_filter($arr['weight'], function($v) use ($needle) {
if($v["acronym"] == $needle){
return $v;
}
} );
list($k, $v) = each($f);
return $k;
}
echo getData($arr, "kg");
From PHP8.4, the best performing native function to short-circuit upon finding the first qualifying item and return its parent level key is array_find_key(). Demo
$array = [
"weight" => [
"stone" => ["acronym" => "st"],
"kilogram" => ["acronym" => "kg"],
"pound" => ["acronym" => "lb"]
]
];
var_export(
array_find_key($array['weight'], fn($row) => $row['acronym'] === 'kg')
);
// output: 'kilogram'
