How to pass a callback function as a parameter in PHP Back
In PHP, if you want to pass a callback function into another one, you are supposed to use call_user_func.
<?php
/** Definition */
function f($opt, $callback) {
/** Operation */
/** ... */
call_user_func($callback);
}
/** Calling */
f($opt, function () use ($innerOpt) {
echo 'callBack';
});
?>
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