调试外贸网站php程序的时候，如何把某个php数组或者变量显示出来

在调试外贸网站php程序的时候，有时候想把某个php数组或者变量显示出来，看看问题出在哪里，比如通过下面代码段，把预定义服务器变量数组$_SERVER的内容保存到/www/wwwroot/debug.txt这个文件，看看程序运行结果是否符合预期。
ob_start();
var_dump($_SERVER);
$output = ob_get_clean();
file_put_contents('/www/wwwroot/debug.txt',$output);

刷新网页后，打开debug.txt文件，可以得到下面的结果

array(44) {
  ["SERVER_SOFTWARE"]=>
  string(12) "nginx/1.16.1"
  ["REQUEST_URI"]=>
  string(24) "/wp-admin/admin-ajax.php"
  ["USER"]=>
  string(3) "www"
  ["HOME"]=>
  string(9) "/home/www"
  ["HTTP_COOKIE"]=>
  string(889) "wpforms_fields_group_settings_advanced=true; _ga=GA1.1.2038185236.1713163850; LiveWSPLT81682553=1a6e8cfcccc54ef581bb83f73d4ad848; NPLT81682553fistvisitetime=1713331137294; NPLT81682553IP=%7C116.230.165.243%7C; wp-settings-1=editor%3Dtinymce%26libraryContent%3Dbrowse%26mfold%3Do%26posts_list_mode%3Dlist; wp-settings-time-1=1713339347; LiveWSPLT81682553sessionid=ba0a2ec2a02e4663be183b090a0fef35; NPLT81682553visitecounts=2; vx_user=662073c3e47fa171340281912291695; NPLT81682553LR_lastchat=1; NPLT81682553_lr_show_again=0; NPLT81682553LR_mimiwin=4e014cdc7c3a40e0b71449729024202b; NPLT81682553lastvisitetime=1713409215471; NPLT81682553visitepages=47; sc_is_visitor_unique=rx12972411.1713409216.B33FB038CD284F994D9803AAF2FDA6D2.4.2.2.2.2.2.1.1.1; _ga_HTJEV3RJWB=GS1.1.1713405312.6.1.1713409218.0.0.0; NPLT81682553lastinvite=1713409221784; NPLT81682553LR_check_data=5%7C1713409221803%7C%7C%7C"
  ["HTTP_ACCEPT_LANGUAGE"]=>
  string(47) "zh-CN,zh;q=0.9,en-GB;q=0.8,en-US;q=0.7,en;q=0.6"
  ["HTTP_ACCEPT_ENCODING"]=>
  string(23) "gzip, deflate, br, zstd"
  ["HTTP_REFERER"]=>
  string(93) "https://www.aaa.com/products/AAAA.html"
  ["HTTP_SEC_FETCH_DEST"]=>
  string(5) "empty"
  ["HTTP_SEC_FETCH_MODE"]=>
  string(4) "cors"
  ["HTTP_SEC_FETCH_SITE"]=>
  string(11) "same-origin"
  ["HTTP_ORIGIN"]=>
  string(30) "https://www.aaa.com"
  ["HTTP_SEC_CH_UA_PLATFORM"]=>
  string(11) "\"Windows\""
  ["HTTP_USER_AGENT"]=>
  string(111) "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36"
  ["HTTP_SEC_CH_UA_MOBILE"]=>
  string(2) "?0"
  ["HTTP_X_REQUESTED_WITH"]=>
  string(14) "XMLHttpRequest"
  ["HTTP_CONTENT_TYPE"]=>
  string(68) "multipart/form-data; boundary=----WebKitFormBoundaryBibOI86kluKz0Yh3"
  ["HTTP_ACCEPT"]=>
  string(46) "application/json, text/javascript, */*; q=0.01"
  ["HTTP_SEC_CH_UA"]=>
  string(76) "\"Google Chrome\";v=\"123\", \"Not:A-Brand\";v=\"8\", \"Chromium\";v=\"123\""
  ["HTTP_CONTENT_LENGTH"]=>
  string(4) "1815"
  ["HTTP_HOST"]=>
  string(11) "www.aaa.com"
  ["PATH_INFO"]=>
  string(0) ""
  ["REDIRECT_STATUS"]=>
  string(3) "200"
  ["SERVER_NAME"]=>
  string(11) "www.aaa.com"
  ["SERVER_PORT"]=>
  string(3) "443"
  ["SERVER_ADDR"]=>
  string(13) "112.24.94.106"
  ["REMOTE_PORT"]=>
  string(5) "49306"
  ["REMOTE_ADDR"]=>
  string(15) "116.203.156.234"
  ["GATEWAY_INTERFACE"]=>
  string(7) "CGI/1.1"
  ["HTTPS"]=>
  string(2) "on"
  ["REQUEST_SCHEME"]=>
  string(5) "https"
  ["SERVER_PROTOCOL"]=>
  string(8) "HTTP/2.0"
  ["DOCUMENT_ROOT"]=>
  string(35) "/www/wwwroot/www.aaa.com"
  ["DOCUMENT_URI"]=>
  string(24) "/wp-admin/admin-ajax.php"
  ["SCRIPT_NAME"]=>
  string(24) "/wp-admin/admin-ajax.php"
  ["CONTENT_LENGTH"]=>
  string(4) "1815"
  ["CONTENT_TYPE"]=>
  string(68) "multipart/form-data; boundary=----WebKitFormBoundaryBibOI86kluKz0Yh3"
  ["REQUEST_METHOD"]=>
  string(4) "POST"
  ["QUERY_STRING"]=>
  string(0) ""
  ["SCRIPT_FILENAME"]=>
  string(59) "/www/wwwroot/www.aaa.com/wp-admin/admin-ajax.php"
  ["FCGI_ROLE"]=>
  string(9) "RESPONDER"
  ["PHP_SELF"]=>
  string(24) "/wp-admin/admin-ajax.php"
  ["REQUEST_TIME_FLOAT"]=>
  float(1713409222.1293)
  ["REQUEST_TIME"]=>
  int(1713409222)
}

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