PHP 正则表达式匹配直播流 URL：解析参数及应用场景

The given URL seems to be a live streaming URL for a program. The URL is quite long and contains various parameters. Here is a breakdown of the URL:\n\nURL: http://dongfang5g-mobile-v51-live.bestvcdn.com.cn/3QNQXOCTNBDWO3DIKMWXEG754RCAJW54NVIKHV2UNBVRGAOEHCRIU33OEZHBFJE5TWGGEXT4WODNQD6TDUIWI62JX2EZXBNO4FO2E6QSDQBCMEX5GFSNU6A6G7VVDZPULAYERB36KWWYQ7H2G6ZZ3IXEWUDBBBL3EQ7ISFBJIAXLLRUB6TWD7Q5ROKLGBBD2SLKDFH3OGYFB2P476T3PC5UIHNXLICMKNCYSKFA=/live/program/live/hddfws/4000000/mnf.m3u8\n\nParameters:\n- bitrate=4000000: This parameter specifies the desired bitrate for the streaming.\n- userid=UFdNbVJqB1w0XyIjBVRhUF5UQGYBPw4PYF4jcw0BPgUbLFYxBipLCWdUdnEDBmAMVA: This parameter likely represents the user ID or some form of authentication for accessing the stream.\n- starttime=1690991450: This parameter indicates the start time of the stream.\n- endtime=1690992000: This parameter indicates the end time of the stream.\n- d=3: This parameter is unclear without further context. It could be a custom parameter used by the server.\n\nOverall, the URL is used to access a specific live streaming program with a bitrate of 4,000,000 and includes authentication and time parameters.