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场景

最近项目上需要开发图片文字识别功能，接入了开源的tesseract_ocr，根据

官网介绍

，使用

composer require thiagoalessio/tesseract_ocr

命令安装依赖，但是在执行之后，删除了一些文件，导致项目报错。

解决方案

手动调整自动加载配置。

实现步骤

1. 在项目根目录
   
composer.json

   文件中的
   
require

   对象中添加

"thiagoalessio/tesseract_ocr": "^2.12"

2. 在
   
composer.lock

   文件中的
   
packages

   对象中添加

{
    "name": "thiagoalessio/tesseract_ocr",
    "version": "2.12.0",
    "source": {
        "type": "git",
        "url": "https://github.com/thiagoalessio/tesseract-ocr-for-php.git",
        "reference": "0f10bd7b02bdcba59c4fbd98fbd93a56f93b09b7"
    },
    "dist": {
        "type": "zip",
        "url": "https://api.github.com/repos/thiagoalessio/tesseract-ocr-for-php/zipball/0f10bd7b02bdcba59c4fbd98fbd93a56f93b09b7",
        "reference": "0f10bd7b02bdcba59c4fbd98fbd93a56f93b09b7",
        "shasum": "",
        "mirrors": [
            {
                "url": "https://mirrors.aliyun.com/composer/dists/%package%/%reference%.%type%",
                "preferred": true
            }
        ]
    },
    "require": {
        "php": "^5.3 || ^7.0 || ^8.0"
    },
    "require-dev": {
        "phpunit/php-code-coverage": "^2.2.4 || ^9.0.0"
    },
    "type": "library",
    "autoload": {
        "psr-4": {
            "thiagoalessio\\TesseractOCR\\": "src/"
        }
    },
    "notification-url": "https://packagist.org/downloads/",
    "license": [
        "MIT"
    ],
    "authors": [
        {
            "name": "thiagoalessio",
            "email": "thiagoalessio@me.com"
        }
    ],
    "description": "A wrapper to work with Tesseract OCR inside PHP.",
    "keywords": [
        "OCR",
        "Tesseract",
        "text recognition"
    ],
    "support": {
        "irc": "irc://irc.freenode.net/tesseract-ocr-for-php",
        "issues": "https://github.com/thiagoalessio/tesseract-ocr-for-php/issues",
        "source": "https://github.com/thiagoalessio/tesseract-ocr-for-php"
    },
    "time": "2021-06-04T21:21:33+00:00"
}

3. 将下载的依赖包放到vendor目录下，我这边的路径是
   
vendor\thiagoalessio\tesseract_ocr

4. 在
   
vendor\composer\autoload_classmap.php

   中添加

'thiagoalessio\\TesseractOCR\\Command' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/Command.php',
'thiagoalessio\\TesseractOCR\\FeatureNotAvailableException' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/FeatureNotAvailableException.php',
'thiagoalessio\\TesseractOCR\\FriendlyErrors' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/FriendlyErrors.php',
'thiagoalessio\\TesseractOCR\\ImageNotFoundException' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/ImageNotFoundException.php',
'thiagoalessio\\TesseractOCR\\NoWritePermissionsForOutputFile' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/NoWritePermissionsForOutputFile.php',
'thiagoalessio\\TesseractOCR\\Option' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/Option.php',
'thiagoalessio\\TesseractOCR\\Process' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/Process.php',
'thiagoalessio\\TesseractOCR\\TesseractNotFoundException' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/TesseractNotFoundException.php',
'thiagoalessio\\TesseractOCR\\TesseractOCR' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/TesseractOCR.php',
'thiagoalessio\\TesseractOCR\\TesseractOcrException' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/TesseractOcrException.php',
'thiagoalessio\\TesseractOCR\\UnsuccessfulCommandException' => $vendorDir . '/thiagoalessio/tesseract_ocr/src/UnsuccessfulCommandException.php',

5. 在
   
vendor\composer\autoload_psr4.php

   中添加

'thiagoalessio\\TesseractOCR\\' => array($vendorDir . '/thiagoalessio/tesseract_ocr/src'),

加载的命名空间为：

thiagoalessio\\TesseractOCR\\

，那么将其配置指向的目录文件，$vendorDir 是vendor 目录地址。

6. 在
   
vendor\composer\autoload_static.php

   中的
   
$prefixLengthsPsr4

   数组中添加

't' => 
array (
    'thiagoalessio\\TesseractOCR\\' => 27,
),

将上一步手动添加的依赖包命名空间首字母，如

thiagoalessio\\TesseractOCR\\

首字母为t,放到 t 数组内如果没有，就造出来一个字母变量，包含在里面即可，命名空间尾部为：”// “结尾，写法：命名空间 => 权重整型，权重不能重复

7. 在
   
vendor\composer\autoload_static.php

   中的文件映射目录数组变量
   
$prefixLengthsPsr4

   数组中配置映射目录，添加

'thiagoalessio\\TesseractOCR\\' => 
array (
    0 => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src',
),

写法：命名空间 => 映射目录数组。

8. 在
   
vendor\composer\autoload_static.php

   中的
   
$classMap

   数组中添加

'thiagoalessio\\TesseractOCR\\Command' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/Command.php',
'thiagoalessio\\TesseractOCR\\FeatureNotAvailableException' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/FeatureNotAvailableException.php',
'thiagoalessio\\TesseractOCR\\FriendlyErrors' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/FriendlyErrors.php',
'thiagoalessio\\TesseractOCR\\ImageNotFoundException' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/ImageNotFoundException.php',
'thiagoalessio\\TesseractOCR\\NoWritePermissionsForOutputFile' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/NoWritePermissionsForOutputFile.php',
'thiagoalessio\\TesseractOCR\\Option' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/Option.php',
'thiagoalessio\\TesseractOCR\\Process' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/Process.php',
'thiagoalessio\\TesseractOCR\\TesseractNotFoundException' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/TesseractNotFoundException.php',
'thiagoalessio\\TesseractOCR\\TesseractOCR' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/TesseractOCR.php',
'thiagoalessio\\TesseractOCR\\TesseractOcrException' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/TesseractOcrException.php',
'thiagoalessio\\TesseractOCR\\UnsuccessfulCommandException' => __DIR__ . '/..' . '/thiagoalessio/tesseract_ocr/src/UnsuccessfulCommandException.php',

9. 在
   
vendor\composer\installed.json

   中添加

{
    "name": "thiagoalessio/tesseract_ocr",
    "version": "2.12.0",
    "version_normalized": "2.12.0.0",
    "source": {
        "type": "git",
        "url": "https://github.com/thiagoalessio/tesseract-ocr-for-php.git",
        "reference": "0f10bd7b02bdcba59c4fbd98fbd93a56f93b09b7"
    },
    "dist": {
        "type": "zip",
        "url": "https://api.github.com/repos/thiagoalessio/tesseract-ocr-for-php/zipball/0f10bd7b02bdcba59c4fbd98fbd93a56f93b09b7",
        "reference": "0f10bd7b02bdcba59c4fbd98fbd93a56f93b09b7",
        "shasum": "",
        "mirrors": [
            {
                "url": "https://mirrors.aliyun.com/composer/dists/%package%/%reference%.%type%",
                "preferred": true
            }
        ]
    },
    "require": {
        "php": "^5.3 || ^7.0 || ^8.0"
    },
    "require-dev": {
        "phpunit/php-code-coverage": "^2.2.4 || ^9.0.0"
    },
    "time": "2021-06-04T21:21:33+00:00",
    "type": "library",
    "installation-source": "dist",
    "autoload": {
        "psr-4": {
            "thiagoalessio\\TesseractOCR\\": "src/"
        }
    },
    "notification-url": "https://packagist.org/downloads/",
    "license": [
        "MIT"
    ],
    "authors": [
        {
            "name": "thiagoalessio",
            "email": "thiagoalessio@me.com"
        }
    ],
    "description": "A wrapper to work with Tesseract OCR inside PHP.",
    "keywords": [
        "OCR",
        "Tesseract",
        "text recognition"
    ],
    "support": {
        "irc": "irc://irc.freenode.net/tesseract-ocr-for-php",
        "issues": "https://github.com/thiagoalessio/tesseract-ocr-for-php/issues",
        "source": "https://github.com/thiagoalessio/tesseract-ocr-for-php"
    },
    "install-path": "../thiagoalessio/tesseract_ocr"
},

修改完以上就可以加载了，在项目中使用

use thiagoalessio\TesseractOCR\TesseractOCR;

即可。