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<?php

/**
 * Remove left padding space from all lines,
 * while preserving indentation.
 *
 * @param string $txt
 * @returns string trimmed block of text
 */
function leftTrimBlock($txt)
{
	$pad = 1024;
	preg_replace_callback('/^( *)(?=[^ \n])/m', function ($m) use (&$pad) {
		$pad = min($pad, strlen($m[1]));
	}, $txt);
	return preg_replace("/^ {{$pad}}/m", '', $txt);
}