Function create_function() is deprecated in PHP 7.2

[AlexanderMatveev]

See http://php.net/manual/ru/function.create-function.php

[AlexanderMatveev]

Deprecated: Function create_function() is deprecated
"exception" => ErrorException {
#message: "Deprecated: Function create_function() is deprecated"
#code: 0
#file: "(...)/vendor/emuravjev/mdash/src/Lib.php"
#line: 205
#severity: E_DEPRECATED
}

[Boorj]

All create_function instances should be replaced with lambda functions, this way:

create_function( '$m', 'return EMT_Lib::decrypt_tag($m[1]);');

//  ↓↓↓

function ($m){
    return EMT_Lib::decrypt_tag($m[1]);
}

And, for BC it could be used with wrapper:

if (version_compare(PHP_VERSION, '7.2.0', '<')) { ... }

But looks like all pull requests are merged quite rarely. So for own usage i just changed some things inside my local fork.

[TomasVotruba]

If you need to upgrade more than one create_function to anonymous function (official recommended upgrade), you can use a CLI tool for that.

It's tested on 30 various (and really weird :)) cases.

-$callback = create_function('$a', 'return "<cas:proxy>$a</cas:proxy>";');    
+$callback = function ($a) {
+    return "<cas:proxy>{$a}</cas:proxy>";
+};

Includes concat (.), string quotes and inclined function calls:

-$func = create_function('$atts, $content = null','return "<div class=\"' . $class_list . '\">" . do_shortcode($content) . "</div>";' );
+$func = function ($atts, $content = null) use ($class_list) {
+    return "<div class=\"{$class_list}\">" . do_shortcode($content) . "</div>";
+};

Do you want to automate the hard work?

1. Instal Rector

composer require rector/rector --dev

2. Create config

# rector.yml
services:
    Rector\Php\Rector\FuncCall\CreateFunctionToAnonymousFunctionRector: ~

3. Upgrade your Code

vendor/bin/rector process src --config rector.yml --dry-run
vendor/bin/rector process src --config rector.yml

Enjoy!