How to create a hook function for a PHP function?

Hook functions allow developers to inject custom code before and after other functions are executed, thereby extending or modifying the behavior of existing functions. The following syntax can be used to create a hook function: function function name ($args) { // Custom code}, where $args is the parameter array of the original function. For example, you can create a hook function to track the time of function execution: function track_function_time($args) { // Custom code}, and then apply this hook before the call_user_func_array function to record the function execution time.

Creation of PHP function hook

What is a hook function?

Hook functions are a way to inject custom code before and after other functions are executed. They allow extending or modifying the behavior of an existing function without modifying the original function.

How to create a hook function

To create a hook function, use the following syntax:

function 函数名($args) {
  // 自定义代码
}

Where:

• Function name is the name of the hook function.
• $args is an array containing the arguments passed to the original function.

Practical case

The following example demonstrates how to create a hook function to track the time of function execution:

// 钩子函数：测量函数执行时间
function track_function_time($args) {
  $start_time = microtime(true);

  // 调用原始函数
  call_user_func_array($args[0], array_slice($args, 1));
  
  $end_time = microtime(true);
  echo "Function " . $args[0] . " executed in " . ($end_time - $start_time) . " seconds.\n";
}

// 应用钩子函数
钩子(\'call_user_func_array\', \'track_function_time\');

// 调用函数并记录执行时间
call_user_func_array('my_function', ['arg1', 'arg2']);

Note :

• call_user_func_array function is used to call a function with a variable number of arguments.
• It is important to call the original function before applying the hook to ensure that the hook function has access to the original parameters.

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