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Introduce IsDeprecated: PHP7+ Helper for E_USER_DEPRECATED and E_DEPRECATED Detection

Posted in hack, php, Teknologi by samsonasik on January 18, 2018

Before I continue, allow me to give you my suggestions:

Live with deprecated function is bad, you may can’t upgrade to newer PHP version or newer library as the function that was deprecated already removed in next major/minor version.

Use same environment or at least same major and minor version between local dev and production environment when possible, your life will be easier.

When reality is not always what you want

You may found a a reality when you work at different version of PHP version or library that rely on specific function which already deprecated in some environment, the IsDeprecated may be solution at that time that can verify E_USER_DEPRECATED or E_DEPRECATED trigger error. It utilize jeremeamia/FunctionParser for user defined function check, and zendframework/zend-stdlib’s ErrorHandler for E_DEPRECATED function check.

When you found the passed function is deprecated, you can use alternative function.

Installation

This helper can be installed via composer:

composer require samsonasik/is-deprecated

This helper have features:

1. Detect E_USER_DEPRECATED

  • At independent function
  • At function inside class

You can use IsDeprecated\isDeprecatedUser function with signature:

/**
 * @param  string|array $function the "functionName" or ["ClassName" or object, "functionName"] or "ClassName::functionName"
 * @throws InvalidArgumentException when trigger_error found but the error is not E_USER_DEPRECATED
 * @throws InvalidArgumentException when trigger_error and E_USER_DEPRECATED found but misplaced
 * @return bool
 */
function isDeprecatedUser($function): bool

Note: when trigger_error E_USER_DEPRECATED inside condition, you need to use actual call with signature:

/**
 * @param  callable $function callable function
 * @return bool
 */
function isDeprecatedWithActualCall(callable $function)

1a. Independent Function

The usage is like the following:

use function IsDeprecated\isDeprecatedUser;

function foo()
{
    trigger_error('this method has been deprecated.', E_USER_DEPRECATED);
}

if (isDeprecatedUser('foo')) {
    // apply alternative/new function to call...
} else {
    foo();
}

1.b Function Inside Class

The usage is like the following:

use function IsDeprecated\isDeprecatedUser;

class AClass
{
    public function foo()
    {
        trigger_error('this method has been deprecated.', E_USER_DEPRECATED);
    }

    // check inside with $this
    public function execute()
    {
        if (isDeprecatedUser([$this, 'foo'])) {
             // apply alternative/new function to call...
             return;
        }

        $this->foo();
    }
}

// you may call after instantiation
$object = new \AClass();
if (isDeprecatedUser([$object, 'foo'])) {
    // apply alternative/new function to call...
} else {
    $object->foo();
}

// or
if (isDeprecatedUser(['AClass', 'foo'])) {
    // apply alternative/new function to call...
} else {
    (new \AClass())->foo();
}

2. Detect E_DEPRECATED

E_DEPRECATED can be triggered on Core PHP function call.

You can use IsDeprecated\isDeprecatedCore function with signature:

/**
 * @param  callable $function callable function
 * @return bool
 */
function isDeprecatedCore(callable $function): bool

The usage is like the following:

use function IsDeprecated\isDeprecatedCore;

$function = function () {
    mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
};

if (isDeprecatedCore($function)) {
    // alternative function, eg: openssl ...
} else {
    $function();
}

Limitation

For Core PHP Functions or user function with condition (T_IF or T_SWITCH token), the function passed actually need to be called. It ensure that we don’t get error during call deprecated function, and we can use alternative function if the isDeprecatedCore() returns true with call of isDeprecatedWithActualCall.

You want to use it? You can check my repository https://github.com/samsonasik/IsDeprecated

That’s it ;).

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