README

Kebab is a collection of safety wrappers and testing utilities around a few functions of the PHP standard library. It's so useful that we wanted to use it everywhere, including our personal projects. So we couldn't keep it for ourselves.

Install

composer require mention/kebab

Goals

The goals of this package are to:

Provide wrappers that are safe by default (by throwing exceptions on error)
Provide wrappers with better APIs
Make static analyzers happy
Make testing easier

Some functions in the PHP standard library have a notoriously bad API. Take for example json_decode(): If returns null if there was an error, or if the JSON string was the NULL literal. The package provides sane wrappers that automatically check for errors and throw exceptions on failure. The package also provides a wrapper for less broken functions like file_get_contents(), because throwing exceptions on errors is useful.

The wrappers do not only check for errors, they also try to improve the API. For instance, json_decode() is declined in two variants: JsonUtils::decodeArray() and JsonUtils::decodeObject().

All wrappers have static, single return types, to make static analyzers happy. For example, there is Clock::microtimeFloat() and Clock::microtimeString() instead of a single function returning one of two possible types.

Finally, the package provides some tools to make testing easier, such as the Clock class that allows to fake the system time during tests.

Overview

Clock

Clock wraps time(), microtime(), sleep(), usleep() in a way that allows these functions to return a fake time during tests (and the system time otherwise).

Example:

<?php

Clock::enableMocking(946681200); // 946681200 can be any arbitrary timestamp

Clock::time(); // int(946681200)
Clock::microtimeFloat(); // float(946681200.0)

Clock::usleep(5500000); // returns immediately (no actual sleep)
Clock::microtimeFloat(); // float(946681205.5) : clock has advanced by 5500000 micro seconds

Clock::disableMocking();

Before calling enableMocking(), Clock methods return the true system time, and sleep functions actually pause the program, as expected. After calling enableMocking(), a fake time is returned instead, and sleep functions advance the fake time without actually pausing the program.

This is heavily inspired by Symfony's ClockMock class.

Date\DateUtils

DateUtils provides a few date creation methods. The class uses Clock to get the system time, so its results can be controlled and predicted in tests.

<?php

DateUtils::now(); // Same as new \DateTimeImmutable();

DateUtils::nowMutable(); // Same as new \DateTime();

DateUtils::nowTz($timezone); // Same as new \DateTimeImmutable('now', $timezone);

DateUtils::fromString($dateString); // Same as new \DateTimeImmutable($dateString);

DateUtils::fromString($dateString, $format); // Same as \DateTimeImmutable::createFromFormat($format, $dateString);

DateUtils::fromStringMutable($dateString); // Same as new \DateTime($dateString);

DateUtils::fromStringMutable($dateString, $format); // Same as \DateTime::createFromFormat($format, $dateString);

DateUtils::fromStringTz($dateString, $timezone); // Same as new \DateTimeImmutable($dateString, $timezone);

DateUtils::fromStringTz($dateString, $timezone, $format); // Same as \DateTimeImmutable::createFromFormat($format, $dateString, $timezone);

DateUtils::fromTimestamp($timestamp); // Same as \DateTimeImmutable::createFromFormat("|U", (string) $timestamp);

DateUtils::fromTimestamp($timestamp, $micro); // Same as \DateTimeImmutable::createFromFormat("U u", "$timestamp $micro");

File\FileUtils

This class provides a few file functions that throw an exception in case of failure.

<?php

FileUtils::read($file); // Reads file $file, throws exception on failure

FileUtils::open($file, $mode); // Opens file $file, throws exception on failure

Json\JsonUtils

This class provides a few JSON functions that throw an exception in case of failure, with a slightly improved interface.

<?php

JsonUtils::encode($value); // json_encode, with exceptions on failure

JsonUtils::encodePretty($value); // returns pretty-printed JSON, throw exceptions on failure

JsonUtils::prettify($json); // prettifies a JSON string

JsonUtils::decodeObject($json); // decodes a JSON string, use stdClass to represent JSON objects (same as json_decode($value, false))

JsonUtils::decodeArray($json); // decodes a JSON string, use arrays to represent JSON objects (same as json_decode($value, true))

Log\LogUtils

The method LogUtils::truncate() can be used to prevent logging excessively long values. By default, it truncates the given string to 255 bytes. Truncating can be disabled by setting the NO_TRUNCATE_LOG environment variable to 1.

<?php

LogUtils::truncate($veryLargeString); // Truncates to 255 characters by default.

Pcre\PcreUtils

This class provides PCRE/preg wrappers with a better API:

Throws exceptions in case of error (invalid argument, invalid regex, ...)
Return static, single types

String replacement

<?php

// Only accept string as subject and returns a string
PcreUtils::replace('/bar/', 'foo', 'foobarbaz'); 

// Only accept array as subject and returns an array
PcreUtils::replaceMultiple('/foo/', 'bar', ['foo', 'foo']); 

// Only accept string as subject and returns a string
PcreUtils::replaceArray(['/foo/' => 'bar'], 'foo'); 

// Only accept array as subject and returns an array
PcreUtils::replaceArrayMultiple(['/foo/' => 'bar'], ['foo', 'foo']);

Callback replacement

<?php

// Only accept string as subject and returns a string
PcreUtils::replaceCallback('/\d/', $callback, '123'); 

// Only accept array as subject and returns an array
PcreUtils::replaceCallbackMultiple('/\d/', $callback, ['1', '2']); 

// Only accept string as subject and returns a string
PcreUtils::replaceCallbackArray($patternsAndCallbacks, '123');

// Only accept array as subject and returns an array
PcreUtils::replaceCallbackArrayMultiple($patternsAndCallbacks, ['1', '2']);

Filter replacement

<?php

// Only accept string as subject and returns a string
PcreUtils::filter('/bar/', 'foo', 'foobarbaz');

// Only accept array as subject and returns an array
PcreUtils::filterMultiple('/foo/', 'bar', ['foo', 'foo']);

// Only accept string as subject and returns a string
PcreUtils::filterArray(['/foo/' => 'bar'], 'foo');

// Only accept array as subject and returns an array
PcreUtils::filterArrayMultiple(['/foo/' => 'bar'], ['foo', 'foo']);

Other methods

<?php

// Always returns a boolean or throws on error
PcreUtils::match('/bar/', 'foobarbaz');

// Returns number of hits that matched or throws on error
PcreUtils::matchAll('/foo/', 'foobarbaz');

// Split string by a regular expression
PcreUtils::split('/\d/', 'foo1bar2baz');

// Quote regular expression characters
PcreUtils::quote('foo$bar');

Authors

The Mention team and contributors

mention / kebab

Maintainers

Details