pcntl_signal_get_handler

(PHP 7 >= 7.1.0)

pcntl_signal_get_handler — Get the current handler for specified signal

说明

pcntl_signal_get_handler ( int $signo ) : mixed

The pcntl_signal_get_handler() function will get the current handler for the specified signo.

参数

signo

The signal number.

返回值

This function may return an integer value that refers to SIG_DFL or SIG_IGN. If you set a custom handler a string value containing the function name is returned.

更新日志

版本 说明
7.1.0 pcntl_signal_get_handler() has been added.

范例

Example #1 pcntl_signal_get_handler() example

<?php
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: int(0)

function pcntl_test($signo) {}
pcntl_signal(SIGUSR1, 'pcntl_test');
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: string(10) "pcntl_test"

pcntl_signal(SIGUSR1, SIG_DFL);
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: int(0)

pcntl_signal(SIGUSR1, SIG_IGN);
var_dump(pcntl_signal_get_handler(SIGUSR1)); // Outputs: int(1)
?>

参见

User Contributed Notes

jrdbrndt at gmail dot com 13-Jan-2018 02:06
It is worth noting that supplying an invalid signal number will trigger a warning and return false.