Class

<?php  namespace  App\Libs;    class Iconv {      function phpmake_ico() {          return true;      }      function GDtoICOstr(&$gd_ico_array) {          foreach ($gd_ico_array as $key => $gd_image) {              $IcoWidths[$key]  = ImageSX($gd_image);              $IcoHeights[$key] = ImageSY($gd_image);              $bpp[$key]          = ImageIsTrueColor($gd_image) ? 32 : 24;              $totalcolors[$key]  = ImageColorsTotal($gd_image);              $icXOR[$key] = '';              for ($y = $IcoHeights[$key] - 1; $y >= 0; $y--) {                  for ($x = 0; $x < $IcoWidths[$key]; $x++) {                      $argb = $this->gpc($gd_image, $x, $y);                      $a = round(255 * ((127 - $argb['alpha']) / 127));                      $r = $argb['red'];                      $g = $argb['green'];                      $b = $argb['blue'];                      if ($bpp[$key] == 32) {                          $icXOR[$key] .= chr($b).chr($g).chr($r).chr($a);                      } elseif ($bpp[$key] == 24) {                          $icXOR[$key] .= chr($b).chr($g).chr($r);                      }                      if ($a < 128) {                          @$icANDmask[$key][$y] .= '1';                      } else {                          @$icANDmask[$key][$y] .= '0';                      }                  }                  while (strlen($icANDmask[$key][$y]) % 32) {                      $icANDmask[$key][$y] .= '0';                  }              }              $icAND[$key] = '';              foreach ($icANDmask[$key] as $y => $scanlinemaskbits) {                  for ($i = 0; $i < strlen($scanlinemaskbits); $i += 8) {                      $icAND[$key] .= chr(bindec(str_pad(substr($scanlinemaskbits, $i, 8), 8, '0', STR_PAD_LEFT)));                  }              }          }          foreach ($gd_ico_array as $key => $gd_image) {              $biSizeImage = $IcoWidths[$key] * $IcoHeights[$key] * ($bpp[$key] / 8);              $bfh[$key]  = '';              $bfh[$key] .= "\x28\x00\x00\x00";              $bfh[$key] .= $this->le2s($IcoWidths[$key], 4);              $bfh[$key] .= $this->le2s($IcoHeights[$key] * 2, 4);              $bfh[$key] .= "\x01\x00";              $bfh[$key] .= chr($bpp[$key])."\x00";              $bfh[$key] .= "\x00\x00\x00\x00";              $bfh[$key] .= $this->le2s($biSizeImage, 4);              $bfh[$key] .= "\x00\x00\x00\x00";              $bfh[$key] .= "\x00\x00\x00\x00";              $bfh[$key] .= "\x00\x00\x00\x00";              $bfh[$key] .= "\x00\x00\x00\x00";          }          $icondata  = "\x00\x00";          $icondata .= "\x01\x00";          $icondata .= $this->le2s(count($gd_ico_array), 2);          $dwImageOffset = 6 + (count($gd_ico_array) * 16);          foreach ($gd_ico_array as $key => $gd_image) {              $icondata .= chr($IcoWidths[$key]);              $icondata .= chr($IcoHeights[$key]);              $icondata .= chr($totalcolors[$key]);              $icondata .= "\x00";              $icondata .= "\x01\x00";              $icondata .= chr($bpp[$key])."\x00";              $dwBytesInRes = 40 + strlen($icXOR[$key]) + strlen($icAND[$key]);              $icondata .= $this->le2s($dwBytesInRes, 4);              $icondata .= $this->le2s($dwImageOffset, 4);              $dwImageOffset += strlen($bfh[$key]);              $dwImageOffset += strlen($icXOR[$key]);              $dwImageOffset += strlen($icAND[$key]);          }          foreach ($gd_ico_array as $key => $gd_image) {              $icondata .= $bfh[$key];              $icondata .= $icXOR[$key];              $icondata .= $icAND[$key];          }          return $icondata;      }      function le2s($number, $minbytes=1) {          $intstring = '';          while ($number > 0) {              $intstring = $intstring.chr($number & 255);              $number >>= 8;          }          return str_pad($intstring, $minbytes, "\x00", STR_PAD_RIGHT);      }      function gpc(&$img, $x, $y) {          if (!is_resource($img)) {              return false;          }          return @ImageColorsForIndex($img, @ImageColorAt($img, $x, $y));      }  }  ?>

Controller

if ( $error['text'] == "" && isset($_FILES['upimage']['tmp_name']) && $_FILES['upimage']['tmp_name'] && is_uploaded_file($_FILES['upimage']['tmp_name'])) {                  if ($_FILES['upimage']['type'] > 210000) {                      $error['text'] = "你上传的文件体积超过了限制 最大不能超过200k";                  } else {                      $fileext = array("image/pjpeg", "image/gif", "image/x-png", "image/png", "image/jpeg", "image/jpg");                      if (!in_array($_FILES['upimage']['type'], $fileext)) {                          $error['text'] = "你上传的文件格式不正确 仅支持 jpg，gif，png";                      }else {                          if ($im = @imagecreatefrompng($_FILES['upimage']['tmp_name']) or $im = @imagecreatefromgif($_FILES['upimage']['tmp_name']) or $im = @imagecreatefromjpeg($_FILES['upimage']['tmp_name'])) {                              $imginfo = @getimagesize($_FILES['upimage']['tmp_name']);                              if (!is_array($imginfo)) {                                  $error['text'] = "图形格式错误！";                              }else {                                  switch ($_POST['size']) {                                      case 1;                                          $resize_im = @imagecreatetruecolor(16, 16);                                          $size = 16;                                          break;                                      case 2;                                          $resize_im = @imagecreatetruecolor(32, 32);                                          $size = 32;                                          break;                                      case 3;                                          $resize_im = @imagecreatetruecolor(48, 48);                                          $size = 48;                                          break;                                      case 4;                                          $resize_im = @imagecreatetruecolor(64, 64);                                          $size = 64;                                          break;                                      case 5;                                          $resize_im = @imagecreatetruecolor(128, 128);                                          $size = 128;                                          break;                                      default;                                          $resize_im = @imagecreatetruecolor(64, 64);                                          $size = 64;                                          break;                                  }                                  imagecopyresampled($resize_im, $im, 0, 0, 0, 0, $size, $size, $imginfo[0], $imginfo[1]);                                    $icon = new Iconv();                                    $gd_image_array = array($resize_im);                                  $icon_data = $icon->GDtoICOstr($gd_image_array);                                  $filename = "temp/" . date("Ymdhis") . rand(1, 1000) . ".ico";                                  if (file_put_contents($filename, $icon_data)) {  //                            $output = "生成成功！请点右键->另存为 保存到本地<br><a href="/" mce_href="/""".$filename."/" target=/"_blank/">点击下载</a>";  //                                    echo $filename;                                      //数据展示                                      $icon_arr=[                                          'class'=>'',                                          'time'=>date("Y-m-d H:i:s"),                                          'filename'=>$_FILES['upimage']['name'],                                          'filepath'=>$filename,                                          'size'=>$size                                      ];                                  }                              }                          } else {                                  $error['text'] = "生成错误请重试";                            }                      }                  }              }else{                  $error['text'] = "请选择图片!";              }

展示效果

源码地址

ico在线转换工具已经集成到了开源项目 https://github.com/diandianxiyu/ApiTesting 中 ，在线demo地址稍后再放出