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

Description

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().

Parameters

This function has no parameters.

Return Values

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

Examples

Example #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);
}

The above example will output something similar to:

pcntl_wait failed with errno 10: No child processes

See Also

  • pcntl_strerror() - Retrieve the system error message associated with the given errno