to answer this question: https://stackoverflow.com/questions/53935198/in-my-discord-webhook-i-am-getting-the-error-embeds-0

code.diff

<?php
+ $rank = 34.2;
  $url = "https://discordapp.com/api/webhooks/xxx"; // Censored for privacy

  $hookObject = json_encode([
      "username" => "Promotion Logs",
      "avatar_url" => "https://cdn.discordapp.com/icons/472520717515096078/60cc7dd2864c95a749516d1213359b67.png",
      "tts" => false,
      "embeds" => [
          [
              "title" => "Promotion Logs",
              "type" => "rich",
              "description" => "",
              "url" => "http://police.riverside-roleplay.com/promologs.php",
              "color" => hexdec( "0099ff" ),
              "fields" => [
                  [
                      "name" => "Name",
                      "value" => "dd",
                      "inline" => false
                  ],
                  [
                      "name" => "Rank",
                      "value" => "$rank",
                      "inline" => true
                  ],
                  [
                    "name" => "Their name",
                    "value" => "dd",
                    "inline" => true
                ],
                [
                  "name" => "Old rank",
                  "value" => "dd",
                  "inline" => true
              ],
              [
                "name" => "New rank",
                "value" => "dd",
                "inline" => true
            ],
            [
              "name" => "Reason",
              "value" => "dd",
              "inline" => true
          ],
          [
            "name" => "Date",
            "value" => "dd",
            "inline" => true
        ],
            ]
          ]
      ]

  ], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );

  $ch = curl_init();

  curl_setopt_array( $ch, [
      CURLOPT_URL => $url,
      CURLOPT_POST => true,
      CURLOPT_POSTFIELDS => $hookObject,
      CURLOPT_HTTPHEADER => [
          "Length" => strlen( $hookObject ),
-         "Content-Type" => "application/json"
+         "Content-Type: application/json"
      ]
  ]);

  $response = curl_exec( $ch );
  curl_close( $ch );

  ?>

new-code.php

<?php
  $rank = 34.2;
  $url = "https://discordapp.com/api/webhooks/xxx"; // Censored for privacy

  $hookObject = json_encode([
      "username" => "Promotion Logs",
      "avatar_url" => "https://cdn.discordapp.com/icons/472520717515096078/60cc7dd2864c95a749516d1213359b67.png",
      "tts" => false,
      "embeds" => [
          [
              "title" => "Promotion Logs",
              "type" => "rich",
              "description" => "",
              "url" => "http://police.riverside-roleplay.com/promologs.php",
              "color" => hexdec( "0099ff" ),
              "fields" => [
                  [
                      "name" => "Name",
                      "value" => "dd",
                      "inline" => false
                  ],
                  [
                      "name" => "Rank",
                      "value" => "$rank",
                      "inline" => true
                  ],
                  [
                    "name" => "Their name",
                    "value" => "dd",
                    "inline" => true
                ],
                [
                  "name" => "Old rank",
                  "value" => "dd",
                  "inline" => true
              ],
              [
                "name" => "New rank",
                "value" => "dd",
                "inline" => true
            ],
            [
              "name" => "Reason",
              "value" => "dd",
              "inline" => true
          ],
          [
            "name" => "Date",
            "value" => "dd",
            "inline" => true
        ],
            ]
          ]
      ]

  ], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );

  $ch = curl_init();

  curl_setopt_array( $ch, [
      CURLOPT_URL => $url,
      CURLOPT_POST => true,
      CURLOPT_POSTFIELDS => $hookObject,
      CURLOPT_HTTPHEADER => [
          "Length" => strlen( $hookObject ),
          "Content-Type: application/json"
      ]
  ]);

  $response = curl_exec( $ch );
  curl_close( $ch );

  ?>

original-code.php

<?php
  $url = "https://discordapp.com/api/webhooks/xxx"; // Censored for privacy

  $hookObject = json_encode([
      "username" => "Promotion Logs",
      "avatar_url" => "https://cdn.discordapp.com/icons/472520717515096078/60cc7dd2864c95a749516d1213359b67.png",
      "tts" => false,
      "embeds" => [
          [
              "title" => "Promotion Logs",
              "type" => "rich",
              "description" => "",
              "url" => "http://police.riverside-roleplay.com/promologs.php",
              "color" => hexdec( "0099ff" ),
              "fields" => [
                  [
                      "name" => "Name",
                      "value" => "dd",
                      "inline" => false
                  ],
                  [
                      "name" => "Rank",
                      "value" => "$rank",
                      "inline" => true
                  ],
                  [
                    "name" => "Their name",
                    "value" => "dd",
                    "inline" => true
                ],
                [
                  "name" => "Old rank",
                  "value" => "dd",
                  "inline" => true
              ],
              [
                "name" => "New rank",
                "value" => "dd",
                "inline" => true
            ],
            [
              "name" => "Reason",
              "value" => "dd",
              "inline" => true
          ],
          [
            "name" => "Date",
            "value" => "dd",
            "inline" => true
        ],
            ]
          ]
      ]

  ], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );

  $ch = curl_init();

  curl_setopt_array( $ch, [
      CURLOPT_URL => $url,
      CURLOPT_POST => true,
      CURLOPT_POSTFIELDS => $hookObject,
      CURLOPT_HTTPHEADER => [
          "Length" => strlen( $hookObject ),
          "Content-Type" => "application/json"
      ]
  ]);

  $response = curl_exec( $ch );
  curl_close( $ch );

  ?>