Declaration
Be aware of the ; after function declaration (parse error syntax, without it).
/**
* Anonimous function - declaration
*/
$a = function($var) {
return "Hello $var";
}; // ; at the end
echo $a('World'); // outputs: Hello World
Callbacks
Anonymous functions are useful when using callback functions.
/**
* Callbaks with filter and map
*/
$A = array(0, 3, 10);
$B = array_filter(
$A, fn($x) => $x % 2 == 0 // is even
);
$C = array_map(
fn($x) => $x*$x, $A // square
);
print_r($B); // 0, 100
print_r($C); // 0, 9, 100
Last update: 625 days ago
