Huge changes

.gitignore

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+vendor/
+tests/fixtures/to/*

.travis.yml

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+language: php
+
+php:
+  - 7.1
+  - 7.2
+  - 7.3
+
+before_script:
+  - composer install
+
+script:
+  - mkdir -p build/logs
+  - ./vendor/bin/phpunit --coverage-clover build/logs/clover.xml
+
+after_success:
+  - travis_retry php vendor/bin/php-coveralls -v

composer.json

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+{
+    "name": "jens/php-image-converter",
+    "description": "PHP class to convert image formats",
+    "keywords": ["php", "image", "conversion"],
+    "type": "library",
+    "homepage": "https://github.com/jenstornell/php-image-converter",
+    "license": "MIT",
+    "authors": [{
+        "name": "Jens Törnell",
+        "homepage": "http://www.jenst.se/"
+    }],
+    "require": {
+        "php": "^7.1",
+        "ext-gd": "*",
+        "ext-exif": "*"
+    },
+    "autoload": {
+        "psr-4": {
+            "Jens\\ImageConverter\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Jens\\ImageConverter\\Tests\\": "test/"
+        }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^7.0",
+        "php-coveralls/php-coveralls": "^2.1"
+    }
+}

example.php

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+<?php
+
+if (file_exists(__DIR__ . '/vendor/autoload.php')) {
+    require_once __DIR__ . '/vendor/autoload.php';
+} else {
+    require_once __DIR__ . '/src/ImageConverter.php';
+}
+
+use Jens\ImageConverter\ImageConverter;
+
+$from = __DIR__ . '/tests/fixtures/from/dices.png';
+$to = __DIR__ . '/tests/fixtures/to/dices.webp';
+
+$converter = new ImageConverter();
+
+echo $converter->convert($from, $to, 5);

phpunit.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="vendor/autoload.php" colors="true" backupGlobals="false"
+         backupStaticAttributes="false">
+    <testsuites>
+        <testsuite name="Tests">
+            <directory suffix="Test.php">tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="false">
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
+</phpunit>

src/ImageConverter.php

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+<?php
+
+namespace Jens\ImageConverter;
+
+class ImageConverter
+{
+    /** @var array */
+    private $imageFormat = [
+        'gif',
+        'jpeg',
+        'jpg',
+        'png',
+        'webp',
+    ];
+
+    /** @var array */
+    private $constImageFormat = [
+        IMAGETYPE_GIF => 'gif',
+        IMAGETYPE_JPEG => 'jpeg',
+        IMAGETYPE_PNG => 'png',
+        IMAGETYPE_WEBP => 'webp',
+    ];
+
+    /**
+     * Do image conversion work
+     *
+     * @param string $from
+     * @param string $to
+     *
+     * @return resource
+     * @throws \InvalidArgumentException
+     */
+    public function convert($from, $to, $quality = -1)
+    {
+        $image = $this->loadImage($from);
+        if (!$image) {
+            throw new \InvalidArgumentException(sprintf('Cannot load image from %s', $from));
+        }
+
+        return $this->saveImage($to, $image, $quality);
+    }
+
+    private function loadImage($from)
+    {
+        $extension = $this->getRealExtension($from);
+
+        if (!array_key_exists($extension, $this->constImageFormat)) {
+            throw new \InvalidArgumentException(sprintf('The %s extension is unsupported', $extension));
+        }
+
+        $method = 'imagecreatefrom' . $this->constImageFormat[$extension];
+
+        return $method($from);
+    }
+
+    private function saveImage($to, $image, $quality)
+    {
+        $extension = $this->getExtension($to);
+
+        if ($extension === 'jpg') {
+            $extension = 'jpeg';
+        }
+
+        if (!in_array($extension, $this->imageFormat)) {
+            throw new \InvalidArgumentException(sprintf('The %s extension is unsupported', $extension));
+        }
+        if (!file_exists(dirname($to))) {
+            $this->makeDirectory($to);
+        }
+
+        $method = 'image' . $extension;
+
+        return $method($image, $to, $quality);
+    }
+
+    /**
+     * Given specific $path to detect current image extension
+     */
+    private function getRealExtension($path)
+    {
+        $extension = exif_imagetype($path);
+
+        if (!array_key_exists($extension, $this->constImageFormat)) {
+            throw new \InvalidArgumentException(sprintf('Cannot detect %s extension', $path));
+        }
+
+        return $extension;
+    }
+
+    /**
+     * Get image extension from specific $path
+     *
+     * @param string $path
+     *
+     * @return string
+     */
+    private function getExtension($path)
+    {
+        $pathInfo = pathinfo($path);
+
+        if (!array_key_exists('extension', $pathInfo)) {
+            throw new \InvalidArgumentException(sprintf('Cannot find extension from %s', $path));
+        }
+
+        return $pathInfo['extension'];
+    }
+
+    /**
+     * Try creating the directory
+     *
+     * @return bool
+     * @throws \InvalidArgumentException
+     */
+    private function makeDirectory($to)
+    {
+        $result = @mkdir(dirname($to), 0755);
+
+        if (!$result) {
+            throw new \InvalidArgumentException(\sprintf('Cannot create %s directory', $to));
+        }
+
+        return $result;
+    }
+}

tests/ImageConverterTest.php

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+<?php
+
+namespace Jens\ImageConverter\Tests;
+
+use Jens\ImageConverter\ImageConverter;
+use PHPUnit\Framework\TestCase;
+
+class ImageConverterTest extends TestCase
+{
+    public function pngToAvailablImagesProvider()
+    {
+        return [
+            [__DIR__ . '/fixtures/to/dices.gif'],
+            [__DIR__ . '/fixtures/to/dices.jpg'],
+        ];
+    }
+
+    public function jpgToAvailablImagesProvider()
+    {
+        return [
+            [__DIR__ . '/fixtures/to/dices.gif'],
+            [__DIR__ . '/fixtures/to/dices.png'],
+        ];
+    }
+
+    /**
+     * @dataProvider pngToAvailablImagesProvider
+     */
+    public function testPngToAvailablImages($to)
+    {
+        $from = __DIR__ . '/fixtures/from/dices.png';
+        $converter = new ImageConverter();
+
+        $this->assertTrue($converter->convert($from, $to, 5));
+    }
+
+    /**
+     * @dataProvider jpgToAvailablImagesProvider
+     */
+    public function testJpgToAvailablImages($to)
+    {
+        $from = __DIR__ . '/fixtures/from/road.jpg';
+        $converter = new ImageConverter();
+
+        $this->assertTrue($converter->convert($from, $to, 5));
+    }
+}