Remove the common leading whitespace from all lines in a multi-line string, normalizing indentation.
Code
General$lines = explode("\n", $s);
$nonEmpty = array_filter($lines, fn($l) => trim($l) !== '');
$minIndent = min(array_map(fn($l) => strlen($l) - strlen(ltrim($l)), $nonEmpty)) ?: 0;
return implode("\n", array_map(fn($l) => substr($l, $minIndent), $lines));Parameters
Indented multi-line string
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