diff options
Diffstat (limited to 'user_guide/general/styleguide.html')
| -rw-r--r-- | user_guide/general/styleguide.html | 66 |
1 files changed, 33 insertions, 33 deletions
diff --git a/user_guide/general/styleguide.html b/user_guide/general/styleguide.html index caddddcc4..fc9ceb2e7 100644 --- a/user_guide/general/styleguide.html +++ b/user_guide/general/styleguide.html @@ -34,7 +34,7 @@ <div id="masthead"> <table cellpadding="0" cellspacing="0" border="0" style="width:100%"> <tr> -<td><h1>CodeIgniter User Guide Version 2.0.0</h1></td> +<td><h1>CodeIgniter User Guide Version 2.0.2</h1></td> <td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> </tr> </table> @@ -102,13 +102,13 @@ Style Guide <h2><a name="file_format"></a>File Format</h2> <div class="guidelineDetails"> - <p>Files should be saved with Unicode (UTF-8) encoding. The <abbr title="Byte Order Mark">BOM</abbr> - should <em>not</em> be used. Unlike UTF-16 and UTF-32, there's no byte order to indicate in + <p>Files should be saved with Unicode (UTF-8) encoding. The <abbr title="Byte Order Mark">BOM</abbr> + should <em>not</em> be used. Unlike UTF-16 and UTF-32, there's no byte order to indicate in a UTF-8 encoded file, and the <abbr title="Byte Order Mark">BOM</abbr> can have a negative side effect in PHP of sending output, - preventing the application from being able to set its own headers. Unix line endings should + preventing the application from being able to set its own headers. Unix line endings should be used (LF).</p> - <p>Here is how to apply these settings in some of the more common text editors. Instructions for your + <p>Here is how to apply these settings in some of the more common text editors. Instructions for your text editor may vary; check your text editor's documentation.</p> <h5>TextMate</h5> @@ -137,8 +137,8 @@ Style Guide <h2><a name="php_closing_tag"></a>PHP Closing Tag</h2> <div class="guidelineDetails"> - <p>The PHP closing tag on a PHP document <strong>?></strong> is optional to the PHP parser. However, if used, any whitespace following the closing tag, whether introduced - by the developer, user, or an FTP application, can cause unwanted output, PHP errors, or if the latter are suppressed, blank pages. For this reason, all PHP files should + <p>The PHP closing tag on a PHP document <strong>?></strong> is optional to the PHP parser. However, if used, any whitespace following the closing tag, whether introduced + by the developer, user, or an FTP application, can cause unwanted output, PHP errors, or if the latter are suppressed, blank pages. For this reason, all PHP files should <strong>OMIT</strong> the closing PHP tag, and instead use a comment block to mark the end of file and it's location relative to the application root. This allows you to still identify a file as being complete and not truncated.</p> <code><strong>INCORRECT</strong>: @@ -161,7 +161,7 @@ echo "Here's my code!"; <h2><a name="class_and_method_naming"></a>Class and Method Naming</h2> <div class="guidelineDetails"> - <p>Class names should always start with an uppercase letter. Multiple words should be separated with an underscore, and not CamelCased. All other class methods should be entirely lowercased and named to clearly indicate their function, preferably including a verb. Try to avoid overly long and verbose names.</p> + <p>Class names should always start with an uppercase letter. Multiple words should be separated with an underscore, and not CamelCased. All other class methods should be entirely lowercased and named to clearly indicate their function, preferably including a verb. Try to avoid overly long and verbose names.</p> <code><strong>INCORRECT</strong>: class superclass @@ -184,7 +184,7 @@ class Super_class</code> <code><strong>INCORRECT</strong>: function fileproperties() // not descriptive and needs underscore separator function fileProperties() // not descriptive and uses CamelCase -function getfileproperties() // Better! But still missing underscore separator +function getfileproperties() // Better! But still missing underscore separator function getFileProperties() // uses CamelCase function get_the_file_properties_from_the_file() // wordy @@ -196,7 +196,7 @@ function get_file_properties() // descriptive, underscore separator, and all low <h2><a name="variable_names"></a>Variable Names</h2> <div class="guidelineDetails"> - <p>The guidelines for variable naming is very similar to that used for class methods. Namely, variables should contain only lowercase letters, use underscore separators, and be reasonably named to indicate their purpose and contents. Very short, non-word variables should only be used as iterators in for() loops.</p> + <p>The guidelines for variable naming is very similar to that used for class methods. Namely, variables should contain only lowercase letters, use underscore separators, and be reasonably named to indicate their purpose and contents. Very short, non-word variables should only be used as iterators in for() loops.</p> <code><strong>INCORRECT</strong>: $j = 'foo'; // single letter variables should only be used in for() loops $Str // contains uppercase letters @@ -216,7 +216,7 @@ $last_city <h2><a name="commenting"></a>Commenting</h2> <div class="guidelineDetails"> - <p>In general, code should be commented prolifically. It not only helps describe the flow and intent of the code for less experienced programmers, but can prove invaluable when returning to your own code months down the line. There is not a required format for comments, but the following are recommended.</p> + <p>In general, code should be commented prolifically. It not only helps describe the flow and intent of the code for less experienced programmers, but can prove invaluable when returning to your own code months down the line. There is not a required format for comments, but the following are recommended.</p> <p><a href="http://manual.phpdoc.org/HTMLSmartyConverter/HandS/phpDocumentor/tutorial_phpDocumentor.howto.pkg.html#basics.docblock">DocBlock</a> style comments preceding class and method declarations so they can be picked up by IDEs:</p> @@ -246,9 +246,9 @@ function xml_encode($str)</code> $parts = explode("\n", $str); // A longer comment that needs to give greater detail on what is -// occurring and why can use multiple single-line comments. Try to +// occurring and why can use multiple single-line comments. Try to // keep the width reasonable, around 70 characters is the easiest to -// read. Don't hesitate to link to permanent external resources +// read. Don't hesitate to link to permanent external resources // that may provide greater detail: // // http://example.com/information_about_something/in_particular/ @@ -260,7 +260,7 @@ $parts = $this->foo($parts); <h2><a name="constants"></a>Constants</h2> <div class="guidelineDetails"> - <p>Constants follow the same guidelines as do variables, except constants should always be fully uppercase. <em>Always use CodeIgniter constants when appropriate, i.e. SLASH, LD, RD, PATH_CACHE, etc.</em></p> + <p>Constants follow the same guidelines as do variables, except constants should always be fully uppercase. <em>Always use CodeIgniter constants when appropriate, i.e. SLASH, LD, RD, PATH_CACHE, etc.</em></p> <code><strong>INCORRECT</strong>: myConstant // missing underscore separator and not fully uppercase N // no single-letter constants @@ -298,7 +298,7 @@ function foo($bar = NULL)</code> <strong>&&</strong> is preferred over <strong>AND</strong> but either are acceptable, and a space should always precede and follow <strong>!</strong>.</p> <code><strong>INCORRECT</strong>: if ($foo || $bar) -if ($foo AND $bar) // okay but not recommended for common syntax highlighting applications +if ($foo AND $bar) // okay but not recommended for common syntax highlighting applications if (!$foo) if (! is_array($foo)) @@ -314,8 +314,8 @@ if ( ! is_array($foo)) <h2><a name="comparing_return_values_and_typecasting"></a>Comparing Return Values and Typecasting</h2> <div class="guidelineDetails"> - <p>Some PHP functions return FALSE on failure, but may also have a valid return value of "" or 0, which would evaluate to FALSE in loose comparisons. Be explicit by comparing the variable type when using these return values in conditionals to ensure the return value is indeed what you expect, and not a value that has an equivalent loose-type evaluation.</p> - <p>Use the same stringency in returning and checking your own variables. Use <strong>===</strong> and <strong>!==</strong> as necessary. + <p>Some PHP functions return FALSE on failure, but may also have a valid return value of "" or 0, which would evaluate to FALSE in loose comparisons. Be explicit by comparing the variable type when using these return values in conditionals to ensure the return value is indeed what you expect, and not a value that has an equivalent loose-type evaluation.</p> + <p>Use the same stringency in returning and checking your own variables. Use <strong>===</strong> and <strong>!==</strong> as necessary. <code><strong>INCORRECT</strong>: // If 'foo' is at the beginning of the string, strpos will return a 0, @@ -329,7 +329,7 @@ if (strpos($str, 'foo') === FALSE) <code><strong>INCORRECT</strong>: function build_string($str = "") { - if ($str == "") // uh-oh! What if FALSE or the integer 0 is passed as an argument? + if ($str == "") // uh-oh! What if FALSE or the integer 0 is passed as an argument? { } @@ -344,7 +344,7 @@ function build_string($str = "") } }</code> - <p>See also information regarding <a href="http://us3.php.net/manual/en/language.types.type-juggling.php#language.types.typecasting">typecasting</a>, which can be quite useful. Typecasting has a slightly different effect which may be desirable. When casting a variable as a string, for instance, NULL and boolean FALSE variables become empty strings, 0 (and other numbers) become strings of digits, and boolean TRUE becomes "1":</p> + <p>See also information regarding <a href="http://us3.php.net/manual/en/language.types.type-juggling.php#language.types.typecasting">typecasting</a>, which can be quite useful. Typecasting has a slightly different effect which may be desirable. When casting a variable as a string, for instance, NULL and boolean FALSE variables become empty strings, 0 (and other numbers) become strings of digits, and boolean TRUE becomes "1":</p> <code>$str = (string) $str; // cast $str as a string</code> @@ -362,7 +362,7 @@ function build_string($str = "") <h2><a name="whitespace_in_files"></a>Whitespace in Files</h2> <div class="guidelineDetails"> - <p>No whitespace can precede the opening PHP tag or follow the closing PHP tag. Output is buffered, so whitespace in your files can cause output to begin before CodeIgniter outputs its content, leading to errors and an inability for CodeIgniter to send proper headers. In the examples below, select the text with your mouse to reveal the incorrect whitespace.</p> + <p>No whitespace can precede the opening PHP tag or follow the closing PHP tag. Output is buffered, so whitespace in your files can cause output to begin before CodeIgniter outputs its content, leading to errors and an inability for CodeIgniter to send proper headers. In the examples below, select the text with your mouse to reveal the incorrect whitespace.</p> <p><strong>INCORRECT</strong>:</p> <code> @@ -381,14 +381,14 @@ function build_string($str = "") <h2><a name="compatibility"></a>Compatibility</h2> <div class="guidelineDetails"> - <p>Unless specifically mentioned in your add-on's documentation, all code must be compatible with PHP version 4.3+. Additionally, do not use PHP functions that require non-default libraries to be installed unless your code contains an alternative method when the function is not available, or you implicitly document that your add-on requires said PHP libraries.</p> + <p>Unless specifically mentioned in your add-on's documentation, all code must be compatible with PHP version 5.1+. Additionally, do not use PHP functions that require non-default libraries to be installed unless your code contains an alternative method when the function is not available, or you implicitly document that your add-on requires said PHP libraries.</p> </div> <h2><a name="class_and_file_names_using_common_words"></a>Class and File Names using Common Words</h2> <div class="guidelineDetails"> - <p>When your class or filename is a common word, or might quite likely be identically named in another PHP script, provide a unique prefix to help prevent collision. Always realize that your end users may be running other add-ons or third party PHP scripts. Choose a prefix that is unique to your identity as a developer or company.</p> + <p>When your class or filename is a common word, or might quite likely be identically named in another PHP script, provide a unique prefix to help prevent collision. Always realize that your end users may be running other add-ons or third party PHP scripts. Choose a prefix that is unique to your identity as a developer or company.</p> <code><strong>INCORRECT</strong>: class Email pi.email.php @@ -405,7 +405,7 @@ class Pre_import mod.pre_import.php <h2><a name="database_table_names"></a>Database Table Names</h2> <div class="guidelineDetails"> - <p>Any tables that your add-on might use must use the 'exp_' prefix, followed by a prefix uniquely identifying you as the developer or company, and then a short descriptive table name. You do not need to be concerned about the database prefix being used on the user's installation, as CodeIgniter's database class will automatically convert 'exp_' to what is actually being used.</p> + <p>Any tables that your add-on might use must use the 'exp_' prefix, followed by a prefix uniquely identifying you as the developer or company, and then a short descriptive table name. You do not need to be concerned about the database prefix being used on the user's installation, as CodeIgniter's database class will automatically convert 'exp_' to what is actually being used.</p> <code><strong>INCORRECT</strong>: email_addresses // missing both prefixes @@ -416,35 +416,35 @@ exp_email_addresses // missing unique prefix exp_pre_email_addresses </code> - <p class="important"><strong>NOTE:</strong> Be mindful that MySQL has a limit of 64 characters for table names. This should not be an issue as table names that would exceed this would likely have unreasonable names. For instance, the following table name exceeds this limitation by one character. Silly, no? <strong>exp_pre_email_addresses_of_registered_users_in_seattle_washington</strong> + <p class="important"><strong>NOTE:</strong> Be mindful that MySQL has a limit of 64 characters for table names. This should not be an issue as table names that would exceed this would likely have unreasonable names. For instance, the following table name exceeds this limitation by one character. Silly, no? <strong>exp_pre_email_addresses_of_registered_users_in_seattle_washington</strong> </div> <h2><a name="one_file_per_class"></a>One File per Class</h2> <div class="guidelineDetails"> - <p>Use separate files for each class your add-on uses, unless the classes are <em>closely related</em>. An example of CodeIgniter files that contains multiple classes is the Database class file, which contains both the DB class and the DB_Cache class, and the Magpie plugin, which contains both the Magpie and Snoopy classes.</p> + <p>Use separate files for each class your add-on uses, unless the classes are <em>closely related</em>. An example of CodeIgniter files that contains multiple classes is the Database class file, which contains both the DB class and the DB_Cache class, and the Magpie plugin, which contains both the Magpie and Snoopy classes.</p> </div> <h2><a name="whitespace"></a>Whitespace</h2> <div class="guidelineDetails"> - <p>Use tabs for whitespace in your code, not spaces. This may seem like a small thing, but using tabs instead of whitespace allows the developer looking at your code to have indentation at levels that they prefer and customize in whatever application they use. And as a side benefit, it results in (slightly) more compact files, storing one tab character versus, say, four space characters.</p> + <p>Use tabs for whitespace in your code, not spaces. This may seem like a small thing, but using tabs instead of whitespace allows the developer looking at your code to have indentation at levels that they prefer and customize in whatever application they use. And as a side benefit, it results in (slightly) more compact files, storing one tab character versus, say, four space characters.</p> </div> <h2><a name="line_breaks"></a>Line Breaks</h2> <div class="guidelineDetails"> - <p>Files must be saved with Unix line breaks. This is more of an issue for developers who work in Windows, but in any case ensure that your text editor is setup to save files with Unix line breaks.</p> + <p>Files must be saved with Unix line breaks. This is more of an issue for developers who work in Windows, but in any case ensure that your text editor is setup to save files with Unix line breaks.</p> </div> <h2><a name="code_indenting"></a>Code Indenting</h2> <div class="guidelineDetails"> - <p>Use Allman style indenting. With the exception of Class declarations, braces are always placed on a line by themselves, and indented at the same level as the control statement that "owns" them.</p> + <p>Use Allman style indenting. With the exception of Class declarations, braces are always placed on a line by themselves, and indented at the same level as the control statement that "owns" them.</p> <code><strong>INCORRECT</strong>: function foo($bar) { @@ -501,7 +501,7 @@ for ($i = 0; $i < 10; $i++) <h2><a name="bracket_spacing"></a>Bracket and Parenthetic Spacing</h2> <div class="guidelineDetails"> - <p>In general, parenthesis and brackets should not use any additional spaces. The exception is that a space should always follow PHP control structures that accept arguments with parenthesis (declare, do-while, elseif, for, foreach, if, switch, while), to help distinguish them from functions and increase readability.</p> + <p>In general, parenthesis and brackets should not use any additional spaces. The exception is that a space should always follow PHP control structures that accept arguments with parenthesis (declare, do-while, elseif, for, foreach, if, switch, while), to help distinguish them from functions and increase readability.</p> <code>INCORRECT: $arr[ $foo ] = 'foo'; @@ -558,9 +558,9 @@ _convert_text() // private method</code> <h2><a name="php_errors"></a>PHP Errors</h2> <div class="guidelineDetails"> - <p>Code must run error free and not rely on warnings and notices to be hidden to meet this requirement. For instance, never access a variable that you did not set yourself (such as $_POST array keys) without first checking to see that it isset().</p> + <p>Code must run error free and not rely on warnings and notices to be hidden to meet this requirement. For instance, never access a variable that you did not set yourself (such as $_POST array keys) without first checking to see that it isset().</p> - <p>Make sure that while developing your add-on, error reporting is enabled for ALL users, and that display_errors is enabled in the PHP environment. You can check this setting with:</p> + <p>Make sure that while developing your add-on, error reporting is enabled for ALL users, and that display_errors is enabled in the PHP environment. You can check this setting with:</p> <code>if (ini_get('display_errors') == 1) { @@ -571,7 +571,7 @@ _convert_text() // private method</code> <code>ini_set('display_errors', 1);</code> - <p class="important"><strong>NOTE:</strong> Setting the <a href="http://us.php.net/manual/en/ref.errorfunc.php#ini.display-errors">display_errors</a> setting with ini_set() at runtime is not identical to having it enabled in the PHP environment. Namely, it will not have any effect if the script has fatal errors</p> + <p class="important"><strong>NOTE:</strong> Setting the <a href="http://us.php.net/manual/en/ref.errorfunc.php#ini.display-errors">display_errors</a> setting with ini_set() at runtime is not identical to having it enabled in the PHP environment. Namely, it will not have any effect if the script has fatal errors</p> </div> @@ -609,7 +609,7 @@ $bat = str_replace($foo, $bar, $bag); <h2><a name="strings"></a>Strings</h2> <div class="guidelineDetails"> - <p>Always use single quoted strings unless you need variables parsed, and in cases where you do need variables parsed, use braces to prevent greedy token parsing. You may also use double-quoted strings if the string contains single quotes, so you do not have to use escape characters.</p> + <p>Always use single quoted strings unless you need variables parsed, and in cases where you do need variables parsed, use braces to prevent greedy token parsing. You may also use double-quoted strings if the string contains single quotes, so you do not have to use escape characters.</p> <code><strong>INCORRECT</strong>: "My String" // no variable parsing, so no use for double quotes |