How to handle errors using PHP libraries?

PHP provides a variety of functions to handle errors: error_get_last() gets the latest error, set_error_handler() sets a custom error handling function, register_shutdown_function() handles fatal errors, and trigger_error() triggers a custom error.

Use PHP function library to handle errors

PHP provides a rich function library to handle errors, which helps to develop robust s application. Here's how to use these functions:

1. Use error_get_last() Get the latest error

$error = error_get_last();
if ($error !== NULL) {
  echo '错误消息：' . $error['message'] . PHP_EOL;
}

2. Use set_error_handler() Set a custom error handling function

set_error_handler(function ($errno, $errstr, $errfile, $errline) {
  // 自定义错误处理逻辑
});

3. Use register_shutdown_function() to handle fatal errors

register_shutdown_function(function () {
  $error = error_get_last();
  if ($error !== NULL) {
    // 处理致命错误
  }
});

4. Use trigger_error() to trigger a custom error

trigger_error('这是一个自定义错误', E_USER_WARNING);

Practical case:

Consider the following PHP script, which Attempting to read a file that does not exist:

$file = fopen('non-existent-file.txt', 'r');
if ($file === FALSE) {
  // 使用 error_get_last() 获取错误
  $error = error_get_last();
  // 显示错误消息
  echo '错误消息：' . $error['message'] . PHP_EOL;
}

When the script is run, it will generate the following output:

错误消息：fopen(): failed to open stream: No such file or directory

By using PHP's error handling functions, we are able to handle this error gracefully and Provide users with informative error messages.

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