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Informations about the package filter

filter-php

A filtering implementation for verifying correct data and performing typical modifications to data.

Build Status Scrutinizer Code Quality Coverage Status

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Features

Components

This package is a partial metapackage aggregating the following components:

Example

prints

Composer

To add the library as a local, per-project dependency use Composer! Simply add a dependency on traderinteractive/filter to your project's composer.json file such as:

Documentation

Found in the source itself, take a look!

Filterer

At the core of this library is a Filterer class that can validate the structure of an array and map the data through filters. This behavior is defined by a specification of the different filters to apply and some additional options.

Specification

The specification is an array of key => filter specification pairs.

The keys define the known fields in the array. Any fields in the array that are not in the specification are treated as "unknown" fields and may cause validation to fail, depending on the value of the allowUnknowns option.

The filter specification for a single field is also an array. It can contain predefined filter options.

The rest of the specification for the field are the filters to apply.

The first element in the filter is the filter to run. This can either be something that passes is_callable (e.g., 'trim' or [$object, 'method']) or it can be one of our predefined aliases (e.g., 'float').

The rest of the elements in the filter are the extra arguments to the filter (the value being filtered is always the first argument).

A filter specification can contain any number of filters and the result of each filter is piped in as the input to the next filter. The result of the final filter is set in the result array.

The example above should help clarify all this.

Filterer Options

allowUnknowns

Summary

Flag to allow elements in unfiltered input that are not present in the filterer specification.

Types

Default

The default value is false

Constant

Example

defaultRequired

Summary

Flag for the default required behavior of all elements in the filterer specification. If true all elements in the specification are required unless they have the required filter option set.

Types

Default

The default value is false

Constant

Example

responseType

Summary

Specifies the type of response which The Filterer::filter method will return. It can be array or \TraderInteractive\FilterResponse

Types

Default

The default value is array

Constant

Example

Filter Options

required

Summary

Defines whether this field is a required element of the array. This value overrides the global filter specification's defaultRequired option.

Types

Default

The default value depends on the defaultRequired Filterer Option.

Constant

Example

default

Summary

Defines what the default value of this field is if none is given. A field with a default value will be guaranteed to be in the result. The required value does not affect default behavior.

Types

Default

There is no default value for this option.

Constant

Example

error

Summary

Defines a custom error message to be returned if the value fails filtering. Within the error string, {value} can be used as a placeholder for the value that failed filtering.

Types

Default

There is no default value for this option.

Constant

Example

conflictsWith

Summary

Defines any input fields with which a given field will conflict. Used when one field can be given in input or another but not both.

Types

Default

There is no default value for this option.

Constant

Example

uses

Summary

Specifies an array of input values that should be used as part of a field's filter specification.

Types

Default

The default value for this option is an empty array.

Constant

Example

The exponent filter spec will call the PHP function pow() with the value provided and the result of the filtered base

throwOnError

Summary

If true the Filterer will throw any exception caught when filtering a value instead of returning the error in the filter response.

Types

Default

The default value for this option is false

Constant

Example

If the id value given in the input is not an integer the Filterer::execute() will throw the NotFoundException

returnOnNull

Summary

Flag to break the filter chain if a resulting value is null Useful for nullable fields which require additional filtering if the value is not null.

Types

Default

The default value for this option is false

Constant

Example

If the code value is null then the resulting filtered value will be null. Otherwise the value must be one of the $validCode values.

Included Filters

Of course, any function can potentially be used as a filter, but we include some useful filters with aliases for common circumstances.

Filterer::ofScalars

Aliased in the filterer as ofScalars, this filter verifies that the argument is an array (possibly empty) of scalar items that each pass the given filters (given in the same format as used by Filterer::filter.

The following checks that $value is an array of unsigned integers.

Filterer::ofArrays

Aliased in the filterer as ofArrays, this filter verifies that the argument is an array (possibly empty) of arrays that each pass the given filters (given in the same format as used by Filterer::filter.

The following checks that $value is an array of items that each have an id key with a numeric value. No other keys would be allowed. For example, the following is valid input: [['id' => '1'], ['id' => '2']].

Filterer::ofArray

Aliased in the filterer as ofArray, this filter verifies that the argument is an array that passes the given specification. This is essentially a flipped version of Filterer::filter that allows for testing nested associative arrays.

Arrays::copy

Aliased in the filterer as array-copy, this filter copies values from the source array into a destination array using the provided destination key map.

Example Usage:

Arrays::copyEach

Aliased in the filterer as array-copy-each, this filter copies values from each array in the source array into a destination array using the provided destination key map.

Example Usage:

Arrays::implode

Aliased in the filterer as implode, this filter is a wrapper around implode to ensure proper argument order.

Arrays::in

Aliased in the filterer as in, this filter is a wrapper around in_array including support for strict equality testing.

The following does a strict check for $value against the 3 accepted values.

Arrays::arrayize

Aliased in the filterer as arrayize, this filter returns this original input if it is an array, otherwise returns input wrapped in an array. If the original input is null, an empty array is returned.

Arrays::filter

Aliased in the filterer as array, this filter verifies that the argument is an array and checks the length of the array against bounds. The default bounds are 1+, so an empty array fails by default.

The following checks that the $value is an array with exactly 3 elements.

Arrays::flatten

Aliased in the filterer as flatten, this filter flattens a multi-dimensional array to a single dimension. The order of values will be maintained, but the keys themselves will not. For example:

Arrays::pad

Aliased in the filterer as array-pad, this filter pads an array to the specified length with a value. Padding optionally to the front or end of the array.

Example Usage:

Booleans::filter

Aliased in the filterer as bool, this filter verifies that the argument is a boolean value or a string that maps to one. The second parameter can be set to true to allow null values through without an error (they will stay null and not get converted to false). The last parameters are lists of strings for true values and false values. By default, the strings "true" and "false" map to their boolean counterparts.

The following example converts $value to a boolean allowing the strings "on" and "of".

Booleans::convert

Aliased in the filterer as bool-convert, this filter will convert a given boolean value into the provided true or false conditions. By default the return values are the strings 'true' and 'false'

The following converts the boolean $value to either 'yes' or 'no'

Floats/Ints/UnsignedInt::filter

Aliased in the filterer as float, int, and uint, respectively, these filters verify that the arguments are of the proper numeric type and allow for bounds checking. The second parameter to each of them can be set to true to allow null values through without an error (they will stay null and not get converted to false). The next two parameters are the min and max bounds and can be used to limit the domain of allowed numbers.

Non-numeric strings will fail validation, and numeric strings will be cast.

The float parameter has an additional parameter that can be set to true to cast integers to floats. Without this, integers will fail validation.

The following checks that $value is an integer between 1 and 100 inclusive, and returns the integer (after casting it if it was a string).

Strings::filter

Aliased in the filterer as string, this filter verifies that the argument is a string. The second parameter can be set to true to allow null values through without an error (they will stay null and not get converted to false). The last parameters specify the length bounds of the string. The default bounds are 1+, so an empty string fails by default.

The following checks that $value is a non-empty string.

Strings::concat

Aliased in the filterer as concat, this filter concatenates the given $value, $prefix and $suffix and returns the resulting string.

Strings::explode

Aliased in the filterer as explode, this filter is essentially a wrapper around the built-in explode method with the value first in order to work with the Filterer. It also defaults to using , as a delimiter. For example:

Strings::stripTags

Aliased in the filterer as strip-tags, this filter is essentially a wrapper around the built-in strip_tags function. However, unlike the native function the stripTags method will return null when given a null value.

Strings::translate

Aliased in the filterer as translate, this filter will accept a string value and return its translated value found in the given $valueMap.

Url::filter

Aliased in the filterer as url, this filter verifies that the argument is a URL string according to RFC2396. The second parameter can be set to true to allow null values through without an error (they will stay null and not get converted to false).

The following checks that $value is a URL.

Closures::filter

Aliased in the filterer as closure, this filter verifies that the argument is a closure function.

The following checks that $closureMethod is a closure.

Email::filter

Aliased in the filterer as email, this filter verifies that the argument is an email.

The following checks that $value is an email.

DateTime::filter

Aliased in the filterer as date, this will filter the value as a \DateTime object. The value can be any string that conforms to PHP's valid date/time formats

The following checks that $value is a date/time.

DateTime::format

Aliased in the filterer as date-format, this will filter a given `\DateTime' value to a string based on the given format.

The following returns formatted string for a given \DateTime $value

DateTimeZone::filter

Aliased in the filterer as date, this will filter the value as a \DateTimeZone object. The value can be any supported timezone name

The following checks that $value is a timezone

Json::validate

Aliased in the filter as json, checks that the JSON is valid and returns the original value.

The following ensures that $value is valid JSON

Json::parse

Aliased in the filter as json-decode, checks that the JSON is valid and returns the decoded result.

The following decodes the given value and returns the result.

PhoneFilter::filter

Aliased in the filter as phone, this will filter a given value as a phone. Returning the phone in the specified format.

The following filters the given string into a formatted phone string

TimeOfDayFilter::filter

Aliased in the filterer as time-of-day, this will filter a given string value as a time of day in HH:MM:SS format.

The following ensures that $value is a valid HH:MM:SS formatted string.

XmlFilter::filter

Aliased in the filter as xml, this will ensure the given string value is valid XML, returning the original value.

The following ensures the given string is valid xml.

XmlFilter::extract

Aliased in the filter as xml-extract, this will ensure the given string value is valid XML then extract and return the element found at the given xpath.

The following ensures the given string is valid xml and returns the title element of the first book.

XmlFilter::validate

Aliased in the filter as xml-validate, this will ensure the given string value is valid XML and also confirms to the given XSD file. The original value is returned.

The following ensures the given string is valid xml and matches books.xsd.

Contact

Developers may be contacted at:

Project Build

With a checkout of the code get Composer in your PATH and run:

There is also a docker-based fig configuration that will execute the build inside a docker container. This is an easy way to build the application:

For more information on our build process, read through out our Contribution Guidelines.


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