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Showing content from https://github.com/wapmorgan/PhpCodeFixer below:

wapmorgan/PhpDeprecationDetector: Analyzer of PHP code to search issues with deprecated functionality in newer interpreter versions.

PhpDeprecationDetector - analyzer of PHP code to search usages of deprecated functionality in newer interpreter versions - deprecations detector.

PhpDeprecationDetector detects:

Usage of deprecated functions, variables, constants and ini-directives.
Usage of deprecated functions functionality.
Usage of forbidden names or tricks (e.g. reserved identifiers in newer versions).

It literally helps you find code that can fail after migration to newer PHP version.

Just download a phar from releases page and make executable

chmod +x phpdd-x.x.x.phar

a. Local installation: use it from current folder:

b. Global installation: move it in to one of folders listed in your $PATH and run from any folder:
```
sudo mv phpdd-x.x.x.phar /usr/local/bin/phpdd
phpdd -h
```

Another way to install phpdd is via composer.

Install composer:

curl -sS https://getcomposer.org/installer | php

Install phpdd in global composer dir:

./composer.phar global require wapmorgan/php-deprecation-detector dev-master

Run from any folder:

To scan your files or folder launch phpdd and pass file or directory names.

Description:
  Analyzes PHP code and searches issues with deprecated functionality in newer interpreter versions.

Usage:
  scan [options] [--] <files>...

Arguments:
  files                                    Which files you want to analyze (separate multiple names with a space)?

Options:
  -t, --target[=TARGET]                    Sets target PHP interpreter version. [default: "8.0"]
  -a, --after[=AFTER]                      Sets initial PHP interpreter version for checks. [default: "5.3"]
  -e, --exclude[=EXCLUDE]                  Sets excluded file or directory names for scanning. If need to pass few names, join it with comma.
  -s, --max-size[=MAX-SIZE]                Sets max size of php file. If file is larger, it will be skipped. [default: "1mb"]
      --file-extensions[=FILE-EXTENSIONS]  Sets file extensions to be parsed. [default: "php, php5, phtml"]
      --skip-checks[=SKIP-CHECKS]          Skip all checks containing any of the given values. Pass a comma-separated list for multiple values.
      --output[=OUTPUT]                    The output type required. Options: stdout, json, junit. Defaults to stdout.
      --output-file[=OUTPUT-FILE]          File path to store results where output is not stdout.
  -h, --help                               Display help for the given command. When no command is given display help for the scan command
  -q, --quiet                              Do not output any message
  -V, --version                            Display this application version
      --ansi                               Force ANSI output
      --no-ansi                            Disable ANSI output
  -n, --no-interaction                     Do not ask any interactive question
  -v|vv|vvv, --verbose                     Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

By providing additional option --target you can specify version of PHP to perform less checks. Available target versions: 5.3, 5.4, 5.5, 5.6, 7.0, 7.1, 7.2, 7.3, 7.4, 8.0. A larger version includes rules for checking from all previous.
By providing --exclude option you can exclude specific folders or files from analyze. For example, --exclude vendor will prevent checking third-party libraries.
By providing --skip-checks option you can exclude specific checks from analyze.
If your files has unusual extension, you can specify all exts by --file-extensions option. By default, it uses php, phtml and php5.
If you need to generate machine-readable analyze result, use the --output-file option to specify path to store the output file as specified on --output (json or junit).

> ./bin/phpdd tests/
Max file size set to: 1.000 MiB
Folder /media/wapmorgan/Локальный диск/Документы/PhpDeprecationDetector/tests
- PHP 5.3 (3) - your version is greater or equal
+------------+---------+---------------------------------------------------------------------+
| File:Line  | Type    | Issue                                                               |
+------------+---------+---------------------------------------------------------------------+
| /5.3.php:2 | removed | Function dl() is removed.                                           |
| /5.3.php:3 | removed | Ini define_syslog_variables is removed.                             |
| /5.3.php:5 | changed | Function usage piet() (@call_with_passing_by_reference) is changed. |
|            |         | Call with passing by reference is deprecated. Problem is "&$hoho"   |
+------------+---------+---------------------------------------------------------------------+

- PHP 5.4 (2) - your version is greater or equal
+------------+---------+-----------------------------------------------+
| File:Line  | Type    | Issue                                         |
+------------+---------+-----------------------------------------------+
| /5.4.php:2 | removed | Function mcrypt_generic_end() is removed.     |
|            |         | Consider replace with mcrypt_generic_deinit() |
| /5.4.php:3 | removed | Function magic_quotes_runtime() is removed.   |
+------------+---------+-----------------------------------------------+
...
...
...

Also, you can store analyze result in json format for automatic check. Pass --output-file=FILENAME to write result to FILENAME file or do not set to output to stdout.

Also, you can store analyze result in junit format for automatic check. Pass --output-file=FILENAME to write result to FILENAME file or do not set to output to stdout.

Format of json - dictionary with items:

InfoMessage[] info_messages - list of information messages about analyzing process.
Issue[] problems - list of issues found in your code.
ReplaceSuggestion[] replace_suggestions - list of replacement suggestions based on your code.
Note[] notes - list of notes about new functions behaviour.

Items description:

InfoMessage structure:
- string type - message type - any of (info | warning)
- string message - message text
Issue structure:
- string version - interpreter version which has current issue (like 7.2)
- string file - relative path to file in which issue found (like src/ProblemClass.php)
- string path - absolute path to file in which issue found (like /var/www/html/project/src/ProblemClass.php)
- int line - line in file in which issue found
- int column - column in line in which issue found
- string category - issue category - any of (changed | removed | violation)
- string type - concrete issue type (like "constant" or "identifier")
- string checker - concrete issue object which may cause problem (like magic_quotes_runtime or preg_replace() (@preg_replace_e_modifier))
ReplaceSuggestion structure:
- string type - replacement object type (like variable or ini)
- string problem - replacement object (like mcrypt_generic_end() or each())
- string replacement - suggestion to replace with (like mcrypt_generic_deinit() or foreach())
Note structure:
- string type - type of note (like function_usage or deprecated_feature)
- string problem - note object (like preg_replace() (@preg_replace_e_modifier) or parse_str() (@parse_str_without_argument))
- string note - note text (like Usage of "e" modifier in preg_replace is deprecated: "asdasdsd~ie" or Call to parse_str() without second argument is deprecated)

docker run --rm --interactive --tty --volume $PWD:/app composer:2.2.4 sh
# and inside a container:
docker-php-ext-install bcmath
composer require macfja/phar-builder
echo phar.readonly=0 >> /usr/local/etc/php/php-cli.ini
composer run-script build

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