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% Document Info
\author{Dave Child (DaveChild)}
\pdfinfo{
  /Title (php-fig-psr-standards.pdf)
  /Creator (Cheatography)
  /Author (Dave Child (DaveChild))
  /Subject (PHP-FIG PSR Standards Cheat Sheet)
}

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\noindent
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    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{PHP-FIG PSR Standards Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Dave Child (DaveChild)} via \textcolor{DarkBackground}{\uline{cheatography.com/1/cs/1743/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Dave Child (DaveChild) \\
  \uline{cheatography.com/davechild} \\
        \uline{\seqsplit{aloneonahill}.com}
  \end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 21st February, 2014.\\
   Updated 12th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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Official Site & http://www.php-fig.org \tn 
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\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Accepted Standards}}  \tn
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PSR-0 & Autoloading Standard \tn 
% Row Count 1 (+ 1)
% Row 1
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% Row 2
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PSR-1 & Basic Coding Standard \tn 
% Row Count 3 (+ 1)
% Row 3
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% Row Count 4 (+ 1)
% Row 4
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PSR-2 & Coding Style Guide \tn 
% Row Count 5 (+ 1)
% Row 5
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% Row 6
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PSR-3 & Logger Interface \tn 
% Row Count 7 (+ 1)
% Row 7
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% Row Count 8 (+ 1)
% Row 8
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PSR-4 & Improved Autoloading \tn 
% Row Count 9 (+ 1)
% Row 9
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-0 - Overview}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{A fully-qualified namespace and class must have the following structure \textbackslash{}\textless{}Vendor Name\textgreater{}\textbackslash{}(\textless{}Namespace\textgreater{}\textbackslash{})*\textless{}Class Name\textgreater{}} \tn 
% Row Count 3 (+ 3)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{Each namespace must have a top-level namespace ("Vendor Name").} \tn 
% Row Count 5 (+ 2)
% Row 2
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% Row Count 7 (+ 2)
% Row 3
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% Row Count 9 (+ 2)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{Each \_ character in the CLASS NAME is converted to a DIRECTORY\_SEPARATOR. The \_ character has no special meaning in the namespace.} \tn 
% Row Count 12 (+ 3)
% Row 5
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\mymulticolumn{1}{x{5.377cm}}{The fully-qualified namespace and class is suffixed with .php when loading from the file system.} \tn 
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% Row 6
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\mymulticolumn{1}{x{5.377cm}}{Alphabetic characters in vendor names, namespaces, and class names may be of any combination of lower case and upper case.} \tn 
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% Row 1
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% Row 2
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% Row 3
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% Row 6
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% Row 1
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% Row 2
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% Row 3
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% Row 4
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% Row 5
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% Row 6
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% Row 7
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\mymulticolumn{1}{x{5.377cm}}{Control structure keywords MUST have one space after them; method and function calls MUST NOT.} \tn 
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% Row 8
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% Row 9
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% Row Count 1 (+ 1)
% Row 1
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% Row 2
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% Row 3
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% Row 4
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% Row 5
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% Row 6
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% Row 7
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% Row Count 16 (+ 2)
% Row 8
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\mymulticolumn{1}{x{5.377cm}}{Blank lines MAY be added to improve readability and to indicate related blocks of code.} \tn 
% Row Count 18 (+ 2)
% Row 9
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% Row Count 20 (+ 2)
% Row 10
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% Row Count 22 (+ 2)
% Row 11
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% Row Count 23 (+ 1)
% Row 12
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% Row Count 2 (+ 2)
% Row 1
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% Row Count 4 (+ 2)
% Row 2
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% Row Count 5 (+ 1)
% Row 3
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% Row 0
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% Row Count 2 (+ 2)
% Row 1
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% Row 2
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% Row Count 10 (+ 5)
% Row 3
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% Row Count 11 (+ 1)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{The var keyword MUST NOT be used to declare a property.} \tn 
% Row Count 13 (+ 2)
% Row 5
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% Row Count 15 (+ 2)
% Row 6
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% Row Count 18 (+ 3)
% Row 7
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% Row 8
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% Row 9
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% Row 10
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% Row 11
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% Row 13
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% Row 14
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% Row 15
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% Row Count 14 (+ 4)
% Row 16
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% Row Count 16 (+ 2)
% Row 17
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% Row Count 18 (+ 2)
% Row 18
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% Row Count 23 (+ 5)
% Row 19
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\mymulticolumn{1}{x{5.377cm}}{In the argument list, there MUST NOT be a space before each comma, and there MUST be one space after each comma.} \tn 
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% Row Count 2 (+ 2)
% Row 1
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% Row Count 4 (+ 2)
% Row 2
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% Row Count 6 (+ 2)
% Row 3
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% Row Count 8 (+ 2)
% Row 4
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% Row Count 9 (+ 1)
% Row 5
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% Row Count 11 (+ 2)
% Row 6
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% Row Count 13 (+ 2)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The keyword elseif SHOULD be used instead of else if.} \tn 
% Row Count 15 (+ 2)
% Row 8
\SetRowColor{LightBackground}
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% Row Count 19 (+ 4)
% Row 9
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{There MUST be a comment such as // no break when fall-through is intentional in a non-empty case body.} \tn 
% Row Count 22 (+ 3)
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-2 - Closures}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Closures MUST be declared with a space after the function keyword, and a space before and after the use keyword.} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The opening brace MUST go on the same line, and the closing brace MUST go on the next line following the body.} \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{There MUST NOT be a space after the opening parenthesis of the argument list or variable list, and there MUST NOT be a space before the closing parenthesis of the argument list or variable list.} \tn 
% Row Count 10 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{In the argument list and variable list, there MUST NOT be a space before each comma, and there MUST be one space after each comma.} \tn 
% Row Count 13 (+ 3)
% Row 4
\SetRowColor{LightBackground}
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% Row Count 15 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Argument lists and variable lists MAY be split across multiple lines, where each subsequent line is indented once. When doing so, the first item in the list MUST be on the next line, and there MUST be only one argument or variable per line.} \tn 
% Row Count 20 (+ 5)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{When the ending list (whether or arguments or variables) is split across multiple lines, the closing parenthesis and opening brace MUST be placed together on their own line with one space between them.} \tn 
% Row Count 25 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{PSR-3 - Log Levels (RFC 5424)}}  \tn
% Row 0
\SetRowColor{LightBackground}
debug & error \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
info & critical \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
notice & alert \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
warning & emergency \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-3 - Basics}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{The LoggerInterface exposes eight methods matching log level names (see Log Levels block)} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{A ninth method, log, accepts a log level as first argument. Calling this method with one of the log level constants MUST have the same result as calling the level-specific method.} \tn 
% Row Count 6 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Calling the log method with a level not defined by this specification MUST throw a Psr\textbackslash{}Log\textbackslash{}InvalidArgumentException if the implementation does not know about the level.} \tn 
% Row Count 10 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Users SHOULD NOT use a custom level without knowing for sure the current implementation supports it.} \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-3 - Message}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Every method accepts a string as the message, or an object with a \_\_toString() method.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The message MAY contain placeholders which implementors MAY replace with values from the context array.} \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Placeholder names MUST correspond to keys in the context array.} \tn 
% Row Count 7 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Placeholder names MUST be delimited with a single opening brace \{ and a single closing brace \}. There MUST NOT be any whitespace between the delimiters and the placeholder name.} \tn 
% Row Count 11 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Placeholder names SHOULD be composed only of the characters A-Z, a-z, 0-9, underscore \_, and period .. The use of other characters is reserved for future modifications of the placeholders specification.} \tn 
% Row Count 16 (+ 5)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Implementors MAY use placeholders to implement various escaping strategies and translate logs for display. Users SHOULD NOT pre-escape placeholder values since they can not know in which context the data will be displayed.} \tn 
% Row Count 21 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-3 - Context}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Every method accepts an array as context data. This is meant to hold any extraneous information that does not fit well in a string. The array can contain anything.} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Implementors MUST ensure they treat context data with as much lenience as possible.} \tn 
% Row Count 6 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{A given value in the context MUST NOT throw an exception nor raise any php error, warning or notice.} \tn 
% Row Count 8 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{If an Exception object is passed in the context data, it MUST be in the 'exception' key.} \tn 
% Row Count 10 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Logging exceptions is a common pattern and this allows implementors to extract a stack trace from the exception when the log backend supports it.} \tn 
% Row Count 13 (+ 3)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Implementors MUST still verify that the 'exception' key is actually an Exception before using it as such, as it MAY contain anything.} \tn 
% Row Count 16 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-3 - Helper Classes and Interfaces}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{The Psr\textbackslash{}Log\textbackslash{}AbstractLogger class lets you implement the LoggerInterface very easily by extending it and implementing the generic log method. The other eight methods are forwarding the message and context to it.} \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The Psr\textbackslash{}Log\textbackslash{}LoggerTrait only requires you to implement the generic log method. Note that since traits can not implement interfaces, in this case you still have to implement LoggerInterface.} \tn 
% Row Count 9 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{The Psr\textbackslash{}Log\textbackslash{}NullLogger is provided together with the interface. It MAY be used by users of the interface to provide a fall-back "black hole" implementation if no logger is given to them. However conditional logging may be a better approach if context data creation is expensive.} \tn 
% Row Count 15 (+ 6)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The Psr\textbackslash{}Log\textbackslash{}LoggerAwareInterface only contains a \seqsplit{setLogger(LoggerInterface} \$logger) method and can be used by frameworks to auto-wire arbitrary instances with a logger.} \tn 
% Row Count 19 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{The Psr\textbackslash{}Log\textbackslash{}LoggerAwareTrait trait can be used to implement the equivalent interface easily in any class. It gives you access to \$this-\textgreater{}logger.} \tn 
% Row Count 22 (+ 3)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The Psr\textbackslash{}Log\textbackslash{}LogLevel class holds constants for the eight log levels.} \tn 
% Row Count 24 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-4 Specification}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{A fully qualified class name has the following form: \textbackslash{}\textless{}NamespaceName\textgreater{}(\textbackslash{}\textless{}SubNamespaceNames\textgreater{})*\textbackslash{}\textless{}ClassName\textgreater{}} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The fully qualified class name MUST have a top-level namespace name, also known as a "vendor namespace".} \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{The fully qualified class name MAY have one or more sub-namespace names.} \tn 
% Row Count 8 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The fully qualified class name MUST have a terminating class name.} \tn 
% Row Count 10 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Underscores have no special meaning in any portion of the fully qualified class name.} \tn 
% Row Count 12 (+ 2)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Alphabetic characters in the fully qualified class name MAY be any combination of lower case and upper case.} \tn 
% Row Count 15 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{All class names MUST be referenced in a case-sensitive fashion.} \tn 
% Row Count 17 (+ 2)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{A contiguous series of one or more leading namespace and sub-namespace names, not including the leading namespace separator, in the fully qualified class name (a "namespace prefix") corresponds to at least one "base directory".} \tn 
% Row Count 22 (+ 5)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{The contiguous sub-namespace names after the "namespace prefix" correspond to a subdirectory within a "base directory", in which the namespace separators represent directory separators. The subdirectory name MUST match the case of the sub-namespace names.} \tn 
% Row Count 28 (+ 6)
% Row 9
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{The terminating class name corresponds to a file name ending in .php. The file name MUST match the case of the terminating class name.} \tn 
% Row Count 31 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PSR-4 Specification (cont)}}  \tn
% Row 10
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Autoloader implementations MUST NOT throw exceptions, MUST NOT raise errors of any level, and SHOULD NOT return a value.} \tn 
% Row Count 3 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}