pcntl_get_last_error

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

pcntl_get_last_error — Retrieve the error number set by the last pcntl function which failed

说明

pcntl_get_last_error(): int

Retrieve the error number (errno) set by the last pcntl function that failed. The system error message associated with the error number may be checked with pcntl_strerror().

参数

此函数没有参数。

返回值

Returns the error number (errno) set by the last pcntl function that failed. If there was no error, 0 is returned.

示例

示例 #1 pcntl_get_last_error() 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_strerror() - Retrieve the system error message associated with the given errno