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Use array_keys function for getting keys and than use in original array as $tokens[$arrayKeys[3]] because this index have your required value (day).
ES6 has the find-function for arrays: var val = options.find(function(o){ return o.key==="select" }).value; And maybe wrap it in a function of your own to make it a bit more reusable: function findValue(arr, key){. return arr.find(function(o){ return o.key===key }).value;
permittedValues = array.map(function(value) { return value.key; }); In ES6/ES2015 it's even prettier with arrow functions: permittedValues = array.map(value => value.key); It might be prettier, but it's probably not faster than a for() loop.
Definition and Usage. The array_keys () function returns an array containing the keys. Syntax. array_keys (array, value, strict) Parameter Values. Technical Details. More Examples. Example. Using the value parameter: <?php. $a=array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander"); print_r (array_keys ($a,"Highlander")); ?> Try it Yourself »
array_keys (array $array, mixed $filter_value, bool $strict = false): array. array_keys () returns the keys, numeric and string, from the array. If a filter_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned.
array_values() returns all the values from the array and indexes the array numerically.
The keys() method of Array instances returns a new array iterator object that contains the keys for each index in the array.
In this short article, we understand how JS object get value by key. You can use dot notation or square bracket notation to access the value of the key. But if you have the key stored in a variable, you have to use the square bracket notation.
function get_values_for_keys($mapping, $keys) { foreach($keys as $key) { $output_arr[] = $mapping[$key]; } return $output_arr; } Then you would just call it like so: $a = array('a' => 1, 'b' => 2, 'c' => 3); $values = get_values_for_keys($a, array('a', 'c')); // $values is now array(1, 3)
The key () function simply returns the key of the array element that's currently being pointed to by the internal pointer. It does not move the pointer in any way. If the internal pointer points beyond the end of the elements list or the array is empty, key () returns null.