What is the purpose of the callback function in PHP?
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PHP callbacks are functions that PHP can use to call them dynamically. Native functions such as array map, usort, preg replace callback, and others use them. A callback function is a function that you write and then provide as a parameter to another function. Once the receiving function has access to your callback function, it can use it whenever it wants.
In PHP, a callback function is used to pass a reference to a function as an argument to another function. This allows the receiving function to call back or execute the passed function at a later time, typically to handle events or customize behavior dynamically.