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] = &#39;&#39;;
            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[&#39;alpha&#39;]) / 127));                    
                $r = $argb[&#39;red&#39;];                    
                $g = $argb[&#39;green&#39;];                    
                $b = $argb[&#39;blue&#39;];
                    if ($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][$y] .= &#39;1&#39;;
                    } else {
                        @$icANDmask[$key][$y] .= &#39;0&#39;;
                    }
                }
                while (strlen($icANDmask[$key][$y]) % 32) {                    
                $icANDmask[$key][$y] .= &#39;0&#39;;
                }
            }            $icAND[$key] = &#39;&#39;;
            foreach ($icANDmask[$key] as $y => $scanlinemaskbits) {
                for ($i = 0; $i < strlen($scanlinemaskbits); $i += 8) {                    
                $icAND[$key] .= chr(bindec(str_pad(substr($scanlinemaskbits, $i, 8), 8, &#39;0&#39;, STR_PAD_LEFT)));
                }
            }
        }
        foreach ($gd_ico_array as $key => $gd_image) {            
        $biSizeImage = $IcoWidths[$key] * $IcoHeights[$key] * ($bpp[$key] / 8);            
        $bfh[$key]  = &#39;&#39;;            
        $bfh[$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) {        
    $intstring = &#39;&#39;;
        while ($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));
    }
}
?>

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Controller

if ( $error[&#39;text&#39;] == "" && isset($_FILES[&#39;upimage&#39;][&#39;tmp_name&#39;]) && $_FILES[&#39;upimage&#39;][&#39;tmp_name&#39;] && is_uploaded_file($_FILES[&#39;upimage&#39;][&#39;tmp_name&#39;])) {
                if ($_FILES[&#39;upimage&#39;][&#39;type&#39;] > 210000) {
                    $error[&#39;text&#39;] = "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[&#39;upimage&#39;][&#39;type&#39;], $fileext)) {
                        $error[&#39;text&#39;] = "你上传的文件格式不正确 仅支持 jpg，gif，png";
                    }else {
                        if ($im = @imagecreatefrompng($_FILES[&#39;upimage&#39;][&#39;tmp_name&#39;]) or $im = @imagecreatefromgif($_FILES[&#39;upimage&#39;][&#39;tmp_name&#39;]) 
                        or $im = @imagecreatefromjpeg($_FILES[&#39;upimage&#39;][&#39;tmp_name&#39;])) {
                            $imginfo = @getimagesize($_FILES[&#39;upimage&#39;][&#39;tmp_name&#39;]);
                            if (!is_array($imginfo)) {
                                $error[&#39;text&#39;] = "图形格式错误！";
                            }else {
                                switch ($_POST[&#39;size&#39;]) {
                                    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
                                    $icon_arr=[
                                        &#39;class&#39;=>&#39;&#39;,
                                        &#39;time&#39;=>date("Y-m-d H:i:s"),
                                        &#39;filename&#39;=>$_FILES[&#39;upimage&#39;][&#39;name&#39;],
                                        &#39;filepath&#39;=>$filename,
                                        &#39;size&#39;=>$size
                                    ];
                                }
                            }
                        } else {
                                $error[&#39;text&#39;] = "生成错误请重试";

                        }
                    }
                }
            }else{
                $error[&#39;text&#39;] = "请选择图片!";
            }

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Source code sharing for converting images to ico format using PHP

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