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ImageTool.php

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+<?php
+
+/**
+ * 图片工具
+ * Class ImageTool
+ */
+class ImageTool
+{
+    /**
+     * 获取图片信息
+     * @param $filename
+     * @return array|false
+     */
+    public static function getImageSize($filename)
+    {
+        return getimagesize($filename);
+    }
+
+    /**
+     * 创建空白图片资源
+     * @param $width
+     * @param $height
+     * @return false|GdImage|resource
+     */
+    public static function createResource($width, $height)
+    {
+        return imagecreatetruecolor($width, $height);
+    }
+
+    /**
+     * 创建图片资源
+     * @param $filename
+     * @return false|GdImage|resource|null
+     */
+    public static function createResourceFromFile($filename)
+    {
+        $imageSize = self::getImageSize($filename);
+        switch ($imageSize['mime']) {
+            case 'image/jpeg':
+                $resource = imagecreatefromjpeg($filename);
+                break;
+            case 'image/png':
+                $resource = imagecreatefrompng($filename);
+                break;
+            case 'image/gif':
+                $resource = imagecreatefromgif($filename);
+                break;
+            default:
+                $resource = null;
+        }
+
+        return $resource;
+    }
+
+    /**
+     * 合并图片
+     * @param $resource
+     * @param $addResource
+     * @param array $options
+     * @return mixed
+     */
+    public static function merge(&$resource, $addResource, $options = [])
+    {
+        $options = array_merge([
+            'position' => [0, 0],
+            'pct'      => 100,
+        ], $options);
+        imagecopymerge(
+            $resource,
+            $addResource,
+            $options['position'][0],
+            $options['position'][1],
+            0,
+            0,
+            imagesx($addResource),
+            imagesy($addResource),
+            $options['pct']
+        );
+
+        return $resource;
+    }
+
+    /**
+     * 为图片添加文字
+     * @param $resource
+     * @param string $text
+     * @param array $options
+     * @return mixed
+     */
+    public static function text(&$resource, $text = '', $options = [])
+    {
+        $options         = array_merge([
+            'font'     => __DIR__ . '/font.ttf',
+            'color'    => [255, 255, 255],
+            'size'     => 20,
+            'position' => [25, 20],
+        ], $options);
+        $color           = call_user_func_array(
+            'imagecolorallocate',
+            array_merge([$resource], $options['color'])
+        );
+        $currentEncoding = mb_detect_encoding($text);
+        if ($currentEncoding != 'UTF-8') {
+            $text = iconv($currentEncoding, 'UTF-8', $text);
+        }
+        imagettftext($resource, $options['size'], 0, $options['position'][0], $options['position'][1], $color, $options['font'], $text);
+
+        return $resource;
+    }
+
+    /**
+     * 修改图片/资源大小
+     * @param $filename
+     * @param $width
+     * @param $height
+     * @param false $crop
+     * @return false|GdImage|resource
+     */
+    public static function resize($filename, $width, $height, $crop = false)
+    {
+        if (is_resource($filename)) {
+            $size     = [imagesx($filename), imagesy($filename)];
+            $resource = $filename;
+        } else {
+            $size     = self::getImageSize($filename);
+            $resource = self::createResourceFromFile($filename);
+        }
+        // 宽高比
+        $resourceProp = $size[1] / $size[0];
+        $targetProp   = $height / $width;
+
+        if ($resourceProp > $targetProp) {
+            $targetWidth  = $width;
+            $targetHeight = $width * $resourceProp;
+        } else if ($resourceProp < $targetProp) {
+            $targetHeight = $height;
+            $targetWidth  = $height / $resourceProp;
+        } else {
+            $targetWidth  = $width;
+            $targetHeight = $height;
+        }
+        // 创建资源
+        $targetResource = self::createResource($targetWidth, $targetHeight);
+        // 缩放
+        imagecopyresampled($targetResource, $resource, 0, 0, 0, 0, $targetWidth, $targetHeight, $size[0], $size[1]);
+        // 裁剪
+        if (true === $crop) {
+            // 居中
+            $sourceX      = ($targetWidth - $width) / 2;
+            $sourceY      = ($targetHeight - $height) / 2;
+            $cropResource = self::createResource($width, $height);
+            imagecopy($cropResource, $targetResource, 0, 0, $sourceX, $sourceY, $width, $height);
+
+            return $cropResource;
+        }
+
+        return $targetResource;
+    }
+
+    /**
+     * 保存图片
+     * @param $resource
+     * @param $filename
+     * @return bool
+     */
+    public static function save($resource, $filename)
+    {
+        $fileNameArr = explode('.', $filename);
+        $fileExt     = strtolower(end($fileNameArr));
+        unset($fileNameArr);
+
+        switch ($fileExt) {
+            case 'jpg':
+            case 'jpeg':
+                return imagejpeg($resource, $filename);
+            case 'png':
+                return imagepng($resource, $filename);
+            case 'gif':
+                return imagegif($resource, $filename);
+            default:
+        }
+
+        return false;
+    }
+}

main.php

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+<?php
+
+require 'ImageTool.php';
+
+// 创建图片资源
+$baseResource  = ImageTool::createResourceFromFile('resource/base.png');
+$maskResource1 = ImageTool::createResourceFromFile('resource/mask.png');
+$maskResource2 = ImageTool::createResourceFromFile('resource/mask.jpg');
+$maskResource3 = ImageTool::createResourceFromFile('resource/base.jpg');
+
+// 合并图片
+ImageTool::merge($baseResource, $maskResource1, [
+    'position' => [100, 100],
+]);
+// 合并图片
+ImageTool::merge($baseResource, $maskResource2, [
+    'position' => [400, 190],
+]);
+// 在图片上添加文字
+ImageTool::text($baseResource, '文字');
+// 在图片指定位置添加文字
+ImageTool::text($baseResource, '文字', [
+    'position' => [550, 230],
+]);
+// 在图片指定位置添加文字并设置文字大小
+ImageTool::text($baseResource, '文字', [
+    'size'     => 30,
+    'position' => [200, 200],
+]);
+ImageTool::text($baseResource, '文字', [
+    'size'     => 50,
+    'position' => [220, 60],
+]);
+// 在图片指定位置添加图片
+ImageTool::merge($baseResource, ImageTool::resize($maskResource3, 100, 100), [
+    'position' => [120, 220],
+]);
+// 改变图片大小，强制裁剪
+$baseResource = ImageTool::resize($baseResource, 500, 300, true);
+
+// 保存
+ImageTool::save($baseResource, time() . '.jpg');