Retrieve the system error message associated with the given errno

# pcntl_strerror

(PHP 5 >= 5.3.4, PHP 7, PHP 8)

pcntl_strerror — Retrieve the system error message associated with the given errno

### 说明

function pcntl_strerror(int `$error_code`): string

Returns the system error message associated with the given `error_code` (`errno`) of the last pcntl function that failed. The `error_code` parameter may be obtained by calling pcntl_get_last_error().

### 参数

`error_code`

  An error number (`errno`), returned by pcntl_get_last_error().

### 返回值

Returns the error message, as a string.

### 示例

示例 #1 pcntl_strerror() example

This example will attempt to wait on child processes in a situation where no child process exists, then will print out the corresponding error message.

    <?php
    $pid = pcntl_wait($status);
    if ($pid === -1) {
        $errno = pcntl_get_last_error();
        $message = pcntl_strerror($errno);
        fwrite(STDERR, 'pcntl_wait failed with errno ' . $errno
               . ': ' . $message . PHP_EOL);
    }

以上示例的输出类似于：

    pcntl_wait failed with errno 10: No child processes

### 参见

- pcntl_get_last_error() - Retrieve the error number set by the last pcntl function which failed

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open