I am looking for information about best practices when programming at PHP. I could not find any information about the space before and after the concatenate operator “dot” (.).
$var = "Hello " . $name . " How you doing? today: " . $day;
Maybe there is another standard that specifies this but I didn’t found it.
https://www.php-fig.org/psr/psr-2/
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Answer
PSR-2 doesn’t cover a coding style for operators. They are listed in the conclusion as “intentionally omitted“.
PSR-12: Extended Coding Style expands on PSR-2, and does include guidance around this:
6.2. Binary operators All binary arithmetic, comparison, assignment, bitwise, logical, string, and type operators MUST be preceded and followed by at least one space:
if ($a === $b) {
$foo = $bar ?? $a ?? $b;
} elseif ($a > $b) {
$foo = $a + $b * $c;
}