A problem about PHP getting request headers

the App side takes a client_id header when it initiates the request page.

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tell me how to get this client_id in php. Thank you

Php
Mar.22,2021

function apache_request_headers


$_ SERVER ['HTTP_CLENT_ID']

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-64f5-1b37699-2c096.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37699-2c096.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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