Lines - CZECHGROUP.cz

Line Length (Max 80 Characters)

Rule: Lines of code SHOULD NOT be longer than 80 characters.
Reason: Keeping lines within 80 characters enhances code readability and maintainability. It helps developers easily view the code in various editors without horizontal scrolling.
Action for long lines: If a line exceeds 80 characters, it SHOULD be split into multiple lines of no more than 80 characters each. Alternatively, a comment can be added explaining why the line exceeds the limit.

Example of Splitting a Line:

// Good example: Split a long line into shorter lines
$someLongVariableName = someFunctionThatReturnsAVeryLongString(
    'This is a very long string that needs to be split into multiple lines',
    'to comply with the 80 characters per line rule.'
);

No Trailing Whitespace

Rule: There SHOULD NOT be whitespace at the end of lines.
Reason: Trailing whitespace can cause issues with version control (unintended diffs) and is generally considered sloppy code practice.

Example:

// Correct: No trailing spaces
$var = 'value';

// Incorrect: Trailing spaces at the end of the line
$var = 'value' ;

Blank Lines for Readability

Rule: Blank lines MAY be added to improve readability, especially to separate related blocks of code.
Reason: Blank lines help separate logical sections of code, making it easier to understand the structure and flow.
However, blank lines SHOULD NOT be used where explicitly forbidden (e.g., in certain compact coding styles or frameworks).

One Statement Per Line

Rule: There MUST NOT be more than one statement per line.
Reason: Multiple statements on a single line can make code hard to read, debug, and maintain.

Forbidden Example:

// Forbidden: More than one statement per line
$var = $a; $foo = $b;

Correct Example:

// Correct: One statement per line
$var = $a;
$foo = $b;

Summary:

Keep lines ≤ 80 characters.
No trailing whitespace at the end of lines.
Blank lines are allowed for readability (except where forbidden).
One statement per line – no multiple statements on the same line.