Execution sequence of multiple child processes in php

use PHP multiprocess to listen on multiple rabbitmq queues (php-amqplib used)

2
30

2
0sleep 1
1sleep 2
2

it seems that you have to wait for the main process to generate three child processes and let three child processes execute at the same time

Why is this happening?

Jan.08,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2bdfe-2bafa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2bdfe-2bafa.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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