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Simple Coding Style for PHP - Part 2/2
Some more guidelines:
- "foreach" is better than "for" which is better than "while".
- Never use nonsense names for variables e.g. foo, sz, var and etc.
- Try not to use global variables but if for some reason use them then all global variables and constants will be represented by capital letters e.g. $CACHE_PATH, $FILE_NAME and etc.
- Try making classes where possible.
- Long-lived variable (not necessarily a global, or even in the main scope; it is simply a variable that is used through any significant length of code and/or whose representation can use clarification) should have concise but descriptive names.
- Temporary variables should be short and concise. Numeric variables used for iteration should always be named i, j, k, l, m, and n.
- We’re not going to use tags like the following . We’ll be using or <script language="php"> </script> (work in Front Page too).
- Use echo not print.
- We’ll be using C and C++ style comments i.e. "//" and "/* */". We won’t use "#".
- Comments like the following are useless so avoid using them.
// Increment i $i++;
- Using phpdoc for documentation.
- For multiword names for variables, use underscores to break words.
$num_elements = count($elements);
Function Names:
They should be all lowercase, and multiword names should be separated by underscores. e.g.function print_hello($name) { echo "Hello $name"; }
Class Names:
- The first letter of a class name is capitalized. This visually distinguishes a class name from a member name.
- Underscore should be used to simulate nested namespaces.
- Multiword class names should be concatenated, and the first letter of each word should be capitalized. e.g.
class XML_RSS {} class Text_PrettyPrinter {}
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Method Names:
The Java style is to concatenate words in multiword method names and uppercase the first letter of every word after the first. e.g.class XML_RSS { function startHandler() {} }
Naming Consistency:
Variables that are used for similar purposes should have similar names. e.g.
$max_element; $min_element; $sum_element; $prev_item; $curr_item; $next_item;
-
Matching Variable Names to Schema Names:
Variable names that are associated with database records should always have matching names.
$query = "SELECT firstname, lastname, employee_id FROM employees" $results = mysql_query($query); while(list($firstname, $lastname, $employee_id) = mysql_fetch_row()) { //... }
-
Documentation:
Use phpDocumentor to generate documentation on the fly. Please take a look at the software www.phpdoc.org.
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