PCNTL Functions
PHP Manual

pcntl_get_last_error

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

Description

int pcntl_get_last_error()

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