PHP coding standards (9)_PHP tutorial

5.1 Number of variables declared per line

It is recommended to declare one statement per line because it makes it easier to write comments. That is,

int $level; // The degree of indentation
int $size; // Determined by tab characters

Be better than,

int $level, $size;

Do not place declarations of different types of variables on the same line, for example:

int $foo, $fooarray[]; //Error

Note: In the above example, a space is placed between the type and identifier. Another allowed alternative is to use the tab character:

int $level; // The degree of indentation
int $size; // Determined by the tab character
$currentEntry; // The tab character is usually selected as the indentation standard

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